Catalytic Converter Rattle When Accelerating

So I was having the "cruise control main button won't stay set" issue so had my local repair shop replace my steering wheel cruise control buttons with a new OEM set. Punto also makes a rattling/creaking noise from the back under acceleration with weight in the back whilst in 1st gear. My powerloss is no-more, rattle. This results in excessive back pressure. If the catalyst is broken, it could rattle around and likewise truly clog the exhaust. Like I'm driving a manual transmission that is in a higher gear instead of a lower gear, example tranny is in 5th but should be in 3rd, then it makes a rattling noise. Best Rated in Automotive Replacement Catalytic Converters Compare the most helpful customer reviews of the best rated products in our Automotive Replacement Catalytic Converters store. Page 1 of 2 1 2 Next > It is the catalytic converter. Check your catalytic converter. I hear it worst going over bumps or accerating from idle with the windows down. Catalytic Converters: What Happens When They Go Bad? Image courtesy of Master Muffler The Catalytic Converter may not seem it, but it's much more than a piece of metal under your car. Exterior; Black Grille; Black Power Side Mirrors w/Manual Folding; Black Side Windows Trim, Black Front Windshield Trim and Black Rear Window Trim; Body-Colored Door Handles; Body. My 2015 Nissan Versa Note has started making rattling noise when accelerating at low speed then the sound dies away when it reaches a certain speed. Your Catalytic Converter with Integrated Exhaust Manifold is N113k approximately with a two year warranty and your other two cost 59k and 49k approximately respectively. In my case, it was the heat shields around the 2 primary converters that were rusted and intermittently rattling during acceleration. It may be most noticeable when you first turn your vehicle on and over time and left unattended it will get worse and worse. A catalytic converter and/or lambda sensor is compulsory for your MOT if the first registration of your car is 1993. Symptoms of a broken catalytic converter include loss of power, stalling, or poor fuel economy. Do Catalytic Converters Go Bad? If the catalytic converter life expectancy is exceeded, then the device would most certainly go bad because of old age. Any muffler shop should be able to tack weld the heat shield to prevent the rattling. there have been a. Occasionally, there can be an internal problem. Belt noise can mean the belt is worn or loose. I've regularly changed engine oil according to the schedule. The core of a catalytic converter can break apart, causing this rattling. I've been concerned it is the torque converter because when driving I often get a smell of a clutch burning up. It honestly sounds like its coming from the catalytic converter when I listen to it from outside the car while having someone rev it. My husband asked the Chevy service manager if it could be the catalytic converter and he said no. It is already making the rattling sound again during acceleration and it is only 5 months old. CATALYTIC CHEMISTRY The function of the modern three-way catalytic ­converter is to convert the various compounds of HC, O2 and N2 into more environmentally friendly gases. What you'll hear is a clattering, tinny metal noise when you idle. The exhaust manifold collects the emissions from the engine and funnels the gases through the front pipe to the catalytic converter. A failed emissions test. When cruising in 1st or 2nd, and pressing on the gas to accelerate, the car seems to bog down for a while (2-5 seconds) until it it lurches into the next gear and has power again. In the meantime, I was wondering if anyone on these forums has had a similar problem like this before. If a catalytic converter becomes old or damaged internally from excessively rich fuel mixtures, the catalyst coated. It will be a faint sound when the car is idling in 'park' mode, but the volume and frequency will increase in proportion to acceleration. If your catalytic converter has been stolen, you'll immediately notice a loud sound and altered vehicle performance upon startup. it sounds like something is just rattling around and its not very loud. Bad catalytic converter My 2011 SRT8 has the same issue. The job of the catalytic converter is reducing harmful emissions, so a failed emissions inspection is the most obvious way to discover the problem. Been a noise Ive been hearing for some time and it comes and goes. Uses a Qt of oil every 1500 miles. I'll need to have a proper listen when I travel home tonight, but to my very inexperienced ear, it just sounds like the noise an exhaust would make, just a lot, lot noiser. Re: marbles in a tin can noise when accelerating I'm an amateur but I read somewhere where that very noise you described was attributed to a catalytic converter gone or GOING bad. Usually this means your catalytic converter needs to be replaced or there is a problem with your O2 (oxygen) sensors. When a catalytic converter suffers damage, the delicate ceramic honeycomb may become cracked and broken. When the convertor is replaced, make sure the engine is operating correctly. Yesterday it started making a rattling noise that sounds like something is loose in the catalytic converter. Can anyone post a picture showing where this heat shield is rattling? I just crawled under the jeep the other night looking for my own rattle and couldn't find anything loose. The catalytic converter is an important part because it considerably reduces the harmful gases that your vehicle emits when you drive. In my case, it was the heat shields around the 2 primary converters that were rusted and intermittently rattling during acceleration. After driving around with the 'cleaned' cat for about 100 miles, I pulled it off, and noticed it was rattling. The Honda dealership wanted $1100 (!) saying it was all due to labor since most of the exhaust system would have to come off to get at the shields. calikoolnic asked good questions. I will hear a rattle (sounds like a rattle in can) coming from the front of the car which seems to be located on the driver's side, but it's hard to tell. whatever is in cats (i. My 2015 Nissan Versa Note has started making rattling noise when accelerating at low speed then the sound dies away when it reaches a certain speed. The big V-twin just makes things worse with its constant shaking. help with car problem. These are the symptoms of a failed Catalytic Converter: 1. I do know that the catalytic converter is bad, but it was bad long before this problem started. You step on the gas and all you feel is a jerky, inconsistent response. Need help with your exhaust? We're here when you need us. The engine sounds like a diesel engine when it is cold and sounds the same after it has warmed up when it is under load and acceleration. Exterior; Chrome front and rear bumpers; Conventional lens halogen bulb headlights; Courtesy lights; Gloss paint , black paint , metallic paint; Rear platform step; Heating, Venti. To illustrate, gasoline is a complex hydrocarbon compound in which atoms of hydrogen (H) are bonded in various forms with atoms of carbon (C). I had to change my own cat at 132k miles and it wasn't pretty. Took it to the dealer they said it's the catalytic converter, I ask if this could be a warranty item they said no. There are many different things that could be the culprit when it comes to answering the question,. I got up under the car and could pinpoint the rattling noise coming from the catalytic converter. The catalytic converter is an important part because it considerably reduces the harmful gases that your vehicle emits when you drive. It’s not nearly as devastating as a failing catalytic converter, though… If you have a car making a rattling noise when accelerating, your catalytic converter is probably on the outs. The smell of fuel and a vacuum fitting disconnected. I want to share some information about what's happening here with emissions testing, and some ways to get emissions-compliant without shelling out piles of money. Sent from my VS988 using Tapatalk. there is a tsb for the crown vic and stang for converter rattle it calls for you to replace them. Took it to the dealer, told me my injectors were clogged. Rattles when accelerating, idling, stopped. I believe it's the heat shield around the catalytic converter. Also, is it possible that the core of your catalytic converter is coming loose? When the core separates from the shell, it will cause a rattle at idle and under light loads, but will go away when you accelerate. Sounds like its coming from behind the radio or ac/heating unit. Car Problems With a Rattling Sound When Accelerating by Robert Moore Rattling noise during acceleration can be caused by several different but common failures, including loose heat shields, bad belt pulleys and ignition pinging. is your complete car repair shop that repairs, replaces, and rebuilds exhaust systems and catalytic converters. If it was clogged or clogging up with carbon prior, it would have reduced exhaust pressure to the tailpipe and it may be that there is a leak downstream from the CAT that the idiots didn't find or you're muffler is bad or if the previous CAT came apart there are pieces of it in the resonator or muffler rattling around. If it only rattle when cold it is more likely that it is tapping sound from the hydraulic valve lifters. As soon as I shift to neutral or park it goes away. hey fellas i know this is an old thread but i figure someone might benifit, i just had the same problem with my xr6 ba mk2, the noise i was getting was a rattle/boing with a sqeak if that makes sense? well it kind of sounded like if you put a metal ruler over the edge of a desk and held one half on the desk and flicked the other. I had it checked while it was at the dealer for some work and they claimed that the glass beads in the cats can come loose and they wanted to replace the cats on my dimeNeedless to say I decided to live with it for a while. I took the car to Auto Zone and they said the code was P0420 & P0430. The front catalytic converter’s guts might deteriorate and start to rattle causing a distinctive sound (listen to the video courtesy of Toyo. The rattling noise will get worse the longer the problem isn’t addressed. The internals breaks apart and will rattle on acceleration. It has done about 168,000km and I did have to replace the catalytic converter recently which might have something to do with the rattling noise. Last weekend I was under the truck with a rubber malet banging around trying to reproduce the noise. Things to check; The metal cover to the catalytic converter. there is a rattling sound that i hear while driving that appears to come from the engine compartment, when the car is warmed up and occurs during acceleration. I had about the same problem. On the plus side, you live in Hawaii and take great photos, so all is well. Additionally, the rattling occurs on startup, however it doesn't occur if I rev the engine in neutral. car starts and drives fine, I can even rev it up and all fine in park but the moment i switch it to neutral or drive (no gas or with gas), this loud ticking sound goes off and its driving me crazy!! any idea what would cause this?. Instead it’s caused by excessive rotation of the engine, leading to the flex joint (manifold to catalytic converter) opening more than it should. So, a high level of carbon emission is the obvious consequence of a bad exhaust system. Although construction can vary according to engine application, the common three-way catalytic converter contains a reduction and oxidation stage. Inside, a steel or ceramic matrix coated with inert rare-earth metals converts harmful emissions so that they are less toxic. Symptoms of a broken catalytic converter include loss of power, stalling, or poor fuel economy. It is a very brief sound too, I hear it about 3 times in a span of a few seconds and then its gone. rattling noise when accelerating up hill Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine. Took it to the dealer they said it's the catalytic converter, I ask if this could be a warranty item they said no. These noises may be a sign of holes or cracks somewhere in the exhaust system. Hearing a rattling noise from under the vehicle. The problem presents itself while accelerating at low rpms (1200-2000). You didn't state where the rattling sound appeared to be coming from, but one possibility is a failed catalytic converter. 2009 - 2014 F150 - strange noise durring accelerating - This has happened about half a dozen times while accelerating. If I get under the truck and bang my fist on the cat you can hear it make the same rattling noise(you can distinctly hear it is in the cat). The contact owns a 2012 Ford F-150. On one occasion, after changing the spark plugs, i noticed this annoying rattling that occured only during acceleration. I've been concerned it is the torque converter because when driving I often get a smell of a clutch burning up. Re: Sputtering and losing power while accelerating I had almost the exact same problem with my 95 yj, it turned out to be the catalytic converter. Cheapest way to fix catalytic converter rattle? I have a 2000 Ford Expedition Xlt and after it has been running for a few minutes it makes the most awful rattling noise from the cats, when in gear. It only seems to do it when im about 500 miles away from being due for an oil change, being the standard 3,000 miles to an oil change. It doesn't always happen but it's happening more frequently lately. A metallic rattling sound on acceleration. The sound amplifies when the vehicle is accelerating because the airflow out of the exhaust increases with engine speed. There is an exhaust leak where the pipe meets the other part in the lower engine bay, but would that make a rattling noise? What could it be?. Rattling noises are another symptom of a bad or failing catalytic converter. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. The catalytic converter is an emissions control component in your exhaust system. I poked around under the truck; my best guess is that the noise is coming from the area where the exhaust headers come together into a common pipe, before going through the catalytic convertor. The second weld has yet to break loose. When a vehicle is running rich, the catalytic converter is working harder and running hotter than intended. My 04 LSE seems to have come down with a nasty case of rattling from one of the cats. Observed on 2-3000 rpm. Any ideas/help/experience would be much appreciated. If it gets stuck open, it will drag down your O2 level as sensed before your upstream catalytic converter. he said the battery was not a problem and that it might be the alternator (he admitted he was not too car savy though). The Catalytic Converter has specific coverage under the Federal Emissions Control System Warranty. “the speakers will rattle with songs that have deep bass, even with low volume” Leonard O. This is a difficult one to describe - there's some sort of metallic rattle from either underneath the car or near the driver in the engine compartment when: - the car is under medium to heavy acceleration (in low gears) - when the car is in high gears at lower speeds (not by choice!). These problems allow fuel or air into the wrong place at the wrong time. I've regularly changed engine oil according to the schedule. There are many different things that could be the culprit when it comes to answering the question,. It only seems to do it when im about 500 miles away from being due for an oil change, being the standard 3,000 miles to an oil change. Upon looking at the engine when i got home, i noticed that i left the two lines to the DPFE sensor disconnected. Sounds like right under passenger side front floorboard. 5-L V6) “Passenger side, front Bose dash speaker vibrates during heavy. It will be a faint sound when the car is idling in 'park' mode, but the volume and frequency will increase in proportion to acceleration. Stompie wrote:I know my one boost pipe is loose due to not having a bracket in the same place as the oem pipe and this pipe is also very close to the right drive shaft so im thinking that as i boost the pipe pushes back with the boost and either touches the drive shaft because i can see some marks on it or its touching something else. The Honda dealership wanted $1100 (!) saying it was all due to labor since most of the exhaust system would have to come off to get at the shields. Handling feels a little rough too. The sound resembles a can of marbles rattling under the car at start-up or acceleration. This noise is audible between 20 - 60 mph. 01 Forester S. I have a 2008 Grand Prix and I hear a rattling noise when I accelerate 3 Answers One mechanic suspects a loose heat shield on the cataltytic converter. Corolla is a darn reliable car. Few nights ago I noticed it started making a rattling noise on acceleration just as the tach approached 2,000 rpm. Catalytic Converter Heat Shield 9 N. I'd only hear this rattle pinging noise when I'd push on the gas, and it would be really loud when going up hill. CATALYTIC CHEMISTRY The function of the modern three-way catalytic ­converter is to convert the various compounds of HC, O2 and N2 into more environmentally friendly gases. After they replaced it, it starts fine and quiet now, but now when the car is idling, it makes a rattling noise that sounds it is coming from the front of the car somewhere. Like I'm driving a manual transmission that is in a higher gear instead of a lower gear, example tranny is in 5th but should be in 3rd, then it makes a rattling noise. That also should have a check engine light with a code p0420, but not always. It may be most noticeable when you first turn your vehicle on and over time and left unattended it will get worse and worse. Observed on 2-3000 rpm. If your catalytic converter is broken, this rattling should be loudest when the car starts, and should get worse over time. As soon as the vibration starts, you can let off the gas or step on the gas to change the RPMs and it instantly stops. Ignition pinging is often interpreted as a rattle at first because of the metal-on-metal noise it creates, and it is commonly heard only on acceleration. I'll need to have a proper listen when I travel home tonight, but to my very inexperienced ear, it just sounds like the noise an exhaust would make, just a lot, lot noiser. Do Catalytic Converters Go Bad? If the catalytic converter life expectancy is exceeded, then the device would most certainly go bad because of old age. Cheers dudes. The only object that was making noise was that mesh looking flex pipe (not sure if its a cat) after where the y-pipe comes together. connect the gauge to manifold vacuum. When a catalytic converter gets damaged internally from excessively rich fuel mixtures, the coated honeycombs on the inside of the converter often collapse or break apart. I have been hearing this annoying rattle for a very long time now and finally had the chance to check. Eastern Catalytic manufactures catalytic converters, manifold converters and converter components for aftermarket and OEMs. 6 Symptoms of a Bad Catalytic Converter (and Replacement Cost) Last Updated April 26, 2019 by autotechnician Catalytic converters ( not cadillac converters as some like to say) help remove toxic carbon dioxide gasses that a car produces from entering the outside air that we breathe. In addition, a failed oxygen sensor can cause overheating. Increasing emissions is one of the bad catalytic converter symptoms you should notice. Which will lead to a loss in power especially when accelerating. weird rattling sound fg xr6 - Ford Modifications Website. The sound resembles a can of marbles rattling under the car at start-up or acceleration. But no idea. How do I know when to change my. What you'll hear is a clattering, tinny metal noise when you idle. Now it might be possible the sound continues once I've gotten up to speed and I'm just not hearing it, but it doesn't seem that way. I have been thinking about this and I think the reason this is happening while accelerating and not revving the engine is because the noise is not he result of increased pressure due to higher RPMs. Now It is very audible noice. The purpose of one is simply for emission control but they do cause issues from time to time. my car did the exact same thing. So your car or truck. Punto also makes a rattling/creaking noise from the back under acceleration with weight in the back whilst in 1st gear. Bad catalytic converter My 2011 SRT8 has the same issue. Does A Catalytic Converter Improve Performance? A catalytic converter (also called as cats) is an exhaust emission control device. I tested drive a 2000 Taurus 3. If you hear a rattle then it has come apart inside and needs to be replaced. so if i am going 40 and i am going up a hill and give it some gas and the rpm's are at 2000 to 2500 it make the rattle until it downshifts or i let off the gas. Stompie wrote:I know my one boost pipe is loose due to not having a bracket in the same place as the oem pipe and this pipe is also very close to the right drive shaft so im thinking that as i boost the pipe pushes back with the boost and either touches the drive shaft because i can see some marks on it or its touching something else. These noises may be a sign of holes or cracks somewhere in the exhaust system. There are many different things that could be the culprit when it comes to answering the question,. If a piece breaks off, you may hear a rattling in the. The light went off. There Must Be Another Way The easiest test requiring the fewest special tools is simply removing the oxygen sensor or loosening the exhaust pipe connection upwind of the catalytic converter. After my foot goes farther down on the gas pedal the noise goes away. I Have a 2005 F150 V8 FX4 Lately I have been hearing two strange noises from my the undercarriage of my 150 This noise does not happen often but on some occasions (maybe once a week) I hear what sounds like a chain dragging or rattling under the truck. I have 2008 Toyota Camry which has a rattling catalytic converter. Your vehicle may refuse to start. (530i, 530it, 540i, 540it, 740i, 740il) The typical failure mode is the converter substrate breaking apart and rattling. These pieces will rattle around internally causing a noise that will be more noticeable when turning on the car and will also become progressively louder. Anybody have any input on what you think this might be? It has progressively been getting louder the past few days and the more I hit the gas the quicker it "rattles". At least one catalytic converter has been used on cars since 1975; today, cars may have two or more depending on the engine configuration and manufacturer. I know I can either get new cats or just run a straight pipe through there but what is the cheapest way to elimate this noise?. Both stages of the converter are coated with precious metal catalysts that accelerate chemical reactions without themselves being consumed. The catalytic converter is a component of the exhaust system and must be kept free-flowing to allow the easy passage of exhaust. My rattle is when I let off the gas while coasting over 15mph so to have someone rev it while I listen won't do much for me. I can replicate the noise by letting the car coast a little bit and lightly pressing the gas pedal again. 00 Tech Tip Description: Issue 1: When Locating a Vibration, and Rattle Sound Heard and Felt inside vehicle during hard acceleration that sound as if the Internals of the Cat Convertor became loose, check for interference from the Passenger Side Outer Most Transmission Mount Bolt. The catalytic converter overheats because combustion takes place in the converter rather than the engine when a misfire occurs. Most issues stem from temperature changes in the exhaust system. 2012 Chevy Impala has a rattling noise 18 Answers. Took it in to the dealer and apparently the only thing my extended warranty does not cover is the issue. I've heard a few theories like the oil control valve or the catalytic converter. Could this be the catalytic converter? How would I know? Not at idle, just when accel. Replacement of the part at a dealer is. If I get under the truck and bang my fist on the cat you can hear it make the same rattling noise(you can distinctly hear it is in the cat). 2 3 door stilo. My 04 LSE seems to have come down with a nasty case of rattling from one of the cats. The sound resembles a can of marbles rattling under the car at start-up or acceleration. After headers and full exhaust I developed a rattle after several months. There is usually some other reason for their failure. We had the catalytic converter replaced and the rattle was gone. If I was asked to look at the car my first job would be to remove the oxygen sensor and see if the engine power is there with it removed, that would confirm the blocked exhaust. i have since had it replaced and it sounds just perfect now. If a catalytic converter becomes old or damaged internally from excessively rich fuel mixtures, the catalyst coated. Sent from my VS988 using Tapatalk. We recommended changing the catalytic converter on the Sienna. I've been hearing rattling under the ZJ ('93) for a while now but its worsed recently an rattles louder. The 2009 Toyota Camry has 2 problems reported for rattling noise while accelerating. When I accelerate harder, the sound goes away. Sometimes the substrate will become loose. In the comment section the guy said it WAS the catalytic converter #7 Aaron Vitolins, Oct 6, 2016. my car did the exact same thing. Can you guess on the location of the rattle? Front, rear, undercarriage? I have a 2016 unlimited and I get a slight rattle when accelerating coming from my exhaust. The air mixes with the fine spray of fuel inside the engine and is then lit by the spark plug, causing a controlled explosion, which moves the pistons. Learn to recognize the signs of a faulty converter and get your car checked as soon as possible if you suspect that this part is failing. This results in excessive back pressure. The inside breaks and pieces get into the exhaust and rattle. Rattling noises when starting the vehicle or excessive idling may be a sign of failed or broken hangers. he said the battery was not a problem and that it might be the alternator (he admitted he was not too car savy though). I had the catalytic converter changed 9 months ago, oil levels are fine, just had a tune up, and new calipers. The dealer has tried a different oil filter, checking the converter heat shield for vibration and even replacing some spacers, that were not the correct size on the rocker arms, however, that did not work. Replacement of the part at a dealer is. The catalytic converter sits between the exhaust and the engine, and cleans the exhaust gases of harmful pollutants. Engine spark knock is usually heard during moderate to heavy engine acceleration. Engine spark knock sounds like a metallic knocking, pinging or rattling noise coming from your engine. I believe it's the heat shield around the catalytic converter. Nothing is loose under the hood (prop, washer fluid reservoir ect. You hear a rattling noise coming from the exhaust system. As soon as the vibration starts, you can let off the gas or step on the gas to change the RPMs and it instantly stops. I have taken it to my mechanic 5 times and they cannot diagnose it. help with car problem. At home with the motor off, using a rubber mallet I can duplicate the rattling sound I've heard for the past 5-6 years. The sound amplifies when the vehicle is accelerating because the airflow out of the exhaust increases with engine speed. These noises may be a sign of holes or cracks somewhere in the exhaust system. My 2015 Nissan Versa Note has started making rattling noise when accelerating at low speed then the sound dies away when it reaches a certain speed. If you continue to ignore this light, it will ultimately lead to failure of the catalytic converter. Viper Motorsports provides Exhaust System Repair services to Weatherford, TX, Fort Worth, TX, Mineral Wells, TX, and other surrounding areas. If a clogged or damaged converter’s got your emissions system on the fritz, trust CATCO’s direct fit catalytic converters to deliver the right solution. When reconected, the rattle was. Cheapest way to fix catalytic converter rattle? I have a 2000 Ford Expedition Xlt and after it has been running for a few minutes it makes the most awful rattling noise from the cats, when in gear. What I haven’t been able to determine is whether the noise goes away after I reach a higher speed, or whether the sound of the usually loud engine drowns it out. When you accelerate, the rattle will get louder and louder. If a catalytic converter becomes old or damaged internally from excessively rich fuel mixtures, the catalyst coated. when i first bought my car, there was a. Read on and we'll go over the most common annoying rattlers. Your vehicle may refuse to start. Replacement of the part at a dealer is very expensive but replacement at a muffler shop with after market part is somewhat cheaper. Having a sulfuric, rotten egg-like smell coming from the exhaust. Rattling noises when starting the vehicle or excessive idling may be a sign of failed or broken hangers. I poked around under the truck; my best guess is that the noise is coming from the area where the exhaust headers come together into a common pipe, before going through the catalytic convertor. Check your catalytic converter. Now It is very audible noice. A repair service or inspection may be impending if you hear excessively loud noises during acceleration. I am also wondering about your motor mounts as Juan pointed out. When your cat starts rattling inside, it’s only a matter of time before it causes a blockage that makes your engine run poorly. Sent from my VS988 using Tapatalk. I have a rattle that started up recently. It is worth $80-100. I have knocking noise every morning that goes away after 30 seconds. hey fellas i know this is an old thread but i figure someone might benifit, i just had the same problem with my xr6 ba mk2, the noise i was getting was a rattle/boing with a sqeak if that makes sense? well it kind of sounded like if you put a metal ruler over the edge of a desk and held one half on the desk and flicked the other. They did not replace the ECM. But no idea. When a vehicle is running rich, the catalytic converter is working harder and running hotter than intended. Ghetto "workarounds" -- none of which are recommended -- include. I'm posting about my catalytic converter. Symptoms of a bad converter are loss of power, poor fuel mileage, stalling, hard to start, and a bad smell. Does anyone else have this problem? at first i thought i was something with the muffler but i dont think it is. The car has been great, besides the rattling noise when i accelerate. The sound amplifies when the vehicle is accelerating because the airflow out of the exhaust increases with engine speed. I don't think it's a serious problem - but extremely annoying. 23000 miles, heard the rattle, lost power, misfire, check engine lite stayed on. Now has 210k miles. It seems to occur both accelerating and decelerating. Properly installed and maintained exhaust systems help reduce the emission of harmful pollutants into the atmosphere, decrease noise, and provide better fuel economy. 0 auto tranny. It appears when the engine is cold and i'm accelerating. We recommended changing the catalytic converter on the Sienna. Re: marbles in a tin can noise when accelerating I'm an amateur but I read somewhere where that very noise you described was attributed to a catalytic converter gone or GOING bad. The two issues could be linked, the faulty catalytic converter could be touching against the chassis or something similar. This is one of those times where if the warranty doesn't cover it you should purchase a new one (if you want to be rid of the rattle). A bad torque converter could be the origin of rattling sound when accelerating at low speed. The car has been great, besides the rattling noise when i accelerate. If a piece breaks off, you may hear a rattling in the. Sounds like heat shield, but underneath inspection can't find anything loose or worn. CATALYTIC CHEMISTRY The function of the modern three-way catalytic ­converter is to convert the various compounds of HC, O2 and N2 into more environmentally friendly gases. I didn't notice any holes or anything in the muffler or. Tap the catalytic converter gently with a rubber mallet and listen for a rattling noise if you have been hearing noises as a symptom. Does not appear on start up or at idle, only when depressing accelerator. BlueStar gives purchasers peace of mind and confidence in their purchase, and gives sellers of reliable cars the ability to sell faster and at full value by removing uncertainty about the car’s condition. The catalytic converter is an exhaust emissions control device. At this point you should not drive your vehicle to avoid further possible damage, and have your catalytic converter inspected. I don't think it's a serious problem - but extremely annoying. So your car or truck. In business since 1987, Auto Specialty of Lafayette, Inc. The sound of rattling from inside the catalytic converter when it's shaken is also a pretty straightforward indication of failure. These noises may be a sign of holes or cracks somewhere in the exhaust system. Rattling noises when accelerating can also be attributed to broken heat shields. For about a year now it's been making a metal rattling noise when accelerating between 1500 to 2400 rpm. You may have to register before you can post: click the register link above to proceed. I traced it to the rear - approximately inline with the front seats - catalytic converter. i'm additionally balloting for a broken catalytic converter. Tires are being rotated once. When I hit the catalytic converter in the passenger side exhaust while the car's off, I hear a rattle coming from the front area. 2009 - 2014 F150 - strange noise durring accelerating - This has happened about half a dozen times while accelerating. The catalytic converter is an important part because it considerably reduces the harmful gases that your vehicle emits when you drive. Here are five signs that something may be wrong with your catalytic converter: Your vehicle’s fuel efficiency suddenly drops. So I brought into the dealer today, and they said my catalytic converter is shot and that I must have hit something to cause the damage. It is worth $80-100. This heat can damage the substrate and cause it to melt and degrade. Any ideas/help/experience would be much appreciated. Inside, a steel or ceramic matrix coated with inert rare-earth metals converts harmful emissions so that they are less toxic.