To change it can get pricey – it could be anywhere from $650 to $1,900 to have a catalytic converter replaced in your car. As the engine spins inside, the timing belt or chain needs some guidance, especially as the engine revs climb. How to replace a water pump. Recently it has started to make a rattling sound; not painfully loud but a clearly noticable and sounds somewhat metalic. Auto repair shop owner and … Its hard to tell exactly where its coming from as sound does sometimes travel through other parts. I read from other board about a loose or worn out heat shield so I went under the car and try to look for a loose of broken parts but I cant find any. In fact, left untreated, this minor noise can cause your engine to fail badly. The engine lifters – small hydraulic parts that open and close the engine valves – need engine oil to do their job. Some modern engines naturally rattle very strongly during a cold start. No. These are commonly known to rattle or vibrate as they become loose and produce a bit of a rattling sound that tends to go away as engine RPM’s increase. Answer. That means it isn’t perfectly lined up, and there’s a rattle or knocking noise that happens under load. the car was idling in D with my foot on the brake and there was a loud rattling coming from under the car. Sometimes it may take a little prying here and there while enlisting the aid of someone to blip the throttle for you. The noise can’t be heard inside the cabin and can only heard outside. I noticed that when I stop for a traffic light, the car idles a little higher than 500rpm (around 550 or less) and the car has a rattle noise. Do you. The repair required is essentially an engine rebuild. Sometimes The Catalyst Material Inside The Catalytic Converter Can Break Up Or Become Loose And Create A Rattle. It’s not usually a good idea to drive a long time after you discover the engine making noise for this reason. On the flip side, a common engine rattling noise when the engine is hot is so very minor. Powered by Discourse, best viewed with JavaScript enabled. The connecting rod slams against the crankshaft every time the piston moves up or down. If I feather the throttle to keep the rpm up it goes way, then back at idle it comes back. When you have rod knock, you’ll need an engine rebuild or replacement. November 22, 2010. Plus, who would suspect the out-of-sight flywheel or flexplate would be the issue? Starting up my car which was not driven for 2 days. However, there can be many different causes. You can expect repairs to be up to $4,500 on most common engines. Read more below to find out what the problem could be. Well, my guess would have been a heat sheild, but it seems that you have eliminated that. old cars rattle, trying to fix it may open a worse can of worms. It’s due to excessive heat, poor fuel delivery, and a bunch of other causes too. Can you say, “bad news”? Again thanks guys and thank you Car Talk. Car seems run normal, I don’t notice any change in performance and no check engine or what so ever. this is the hottest place in the exhaust system. If … These thin metal skins are susceptible to rust and corrosion, though. It’s a sign of oil starvation, which means a simple rod bearing replacement would yield the same result in short order. Yes. Heat shields are inexpensive, usually less than $100. Also, when I give car gas (acceleration on pedal) the noise will stop. The microscopic layer of oil between the crankshaft and the connecting rod bearings has worn wider than its normal half-a-hair width. Simply fill out a request for a quote with your vehicle information. On the exhaust system, heat shields prevent hot exhaust temperatures from affecting nearby parts. It’s because the oil is thinner and doesn’t coat parts as well. What is spark knock? What’s actually happening is measured in thousandths of an inch. If you accept the offer, we’ll put money in your pocket, just like that. You can try kicking the tailpipe a little side-to-side and get it jiggling. As long as the rattle is not coming from the engine and/or transmission or any safety components then I’ll let it go… I’ll just play Metallica on the radio to mask it out :). Lack of oil: Some have reported rattling noises when idling being caused by low engine oil levels. Are you sure it’s not one of the belt driven accessory pulleys? With plenty of moving parts under the bonnet of your car, it’s no surprise that a number of problems in this area of your vehicle can cause issues and rattling sounds: Oil pressure. Get paid quick in as little as 24-48 hours! What you’ll hear is a clattering, tinny metal noise when you idle. It’s not a major issue, but you would want to check it to rule … If your engine has low oil pressure, engine rattling at idle might be present when the engine gets hot. It doesn’t take long until it gets much, much worse. I have an older 2001 Honda accord I4 about 160k miles on it. When it begins to break down, little chunks break off and rattle around inside. try checking the heat shield that sits on top of the exhaust manifold. They’re still important to replace – if not for your mental health, then to protect engine parts from exhaust heat. Either a replacement engine or an engine rebuild – either way, it’s going to cost you big money. The rattling started happening after a road trip from Louisiana to Missouri (670 miles / 10 hours) back in December. So, if you hear rattling when your car is idling, check carefully around the interior, including the trunk or cargo area. It’s fast, it’s easy and it’s free to use CarBrain. Find out how much you can get for your damaged car now. If you don't want to deal expensive repair headaches, you can sell your damaged car & move on. Left unrepaired for some time, the catalytic converter will cause running problems as it gets plugged up, plus you won’t pass a smog test. Engine rattling when you idle? The Transmission Fluid Level. Read why car engines need oil right here. Repairs are measured in thousands, probably from $3,000 to $6,000 on most cars. The cause of a heat shield rattle is not always something that can be found visually. Heat shields are metal plates along the exhaust system of your car that deflect heat away from the floor of your vehicle and other heat-sensitive components like fuel tanks, wiring, and brake lines. Vehicle Pick-up is FREE Nationwide. 1 answer & 0 comments. Left alone, the timing belt could skip or break, causing your engine to not run due to engine failure. If you don’t deal with it, that engine rattling sound will never go away. It strangely disappears as soon as you let off the gas, and you might not hear it at all on light acceleration. There are a whole bunch of reasons you might be hearing your car engine making noise. Low oil pressure can be caused by a failing oil pump but it’s much more likely it’s due to lack of maintenance. Your car is always giving you feedback, but are you listening? … If it rattles when idle, it can mean something completely different than engine rattle while accelerating. Its honeycomb-style core superheats unburned gases in the exhaust before it leaves the tailpipe. The flywheel is fastened firm to the engine crankshaft, and the transmission engages it as you begin to drive. Ticking noises coming from your engine, particularly if they become more audible whilst the car is idling, could be indicative of low oil pressure. The air condition is off. I recently noticed that there’s a rattling sound when the car in in idle (800RPM) but it disappear when I rev it up to higher RPM or while driving. This only happens when it is in gear (Drive or Reverse) and does not occur in Park or Neutral. I attach some video (mostly audio anyway) and the rattles start at about t = 1:20. guide on blown engines for various makes and models, Florida Independent Automobile Dealers Association. It seems to be running well and the loud rattle stops when I am moving. This will definitely be a loud engine noise when accelerating, so it should be easy to notice. No Haggle. In case someone else has same symptoms… The root cause is the bolt securing flange connecting the muffler (tail pipe) and the exhaust pipe (after the cat). If the flywheel or flexplate is cracked, it bends slightly as you accelerate due to torque. Rattling on cold start. An engine ticking noise might seem fairly normal, but it could be an early sign of low oil pressure. See if you hear the rattle up front. On some older vehicles, these lifters have been notorious for collapsing, which prevents the oil from pumping them up to work the valves. Rattling noises can be caused by a variety of issues. The noise also only appears when it is warmed (engine running for about 3 - 5 minutes after cold start). Repair costs vary a lot, from $470 to $2,100, all because engines are so different in their parts and labor processes. The engine is the twin cam. If you fire up the engine and you hear a clack-clack-clack right away, there’s a good chance it’s piston slap. They may occur only when the engine is cold, or when it’s fully warmed up. Usually, piston slap happens on all the cylinders at the same time. You may hear them when you start your car, when you drive it or when you apply the brakes. Both vehicles with a timing belt or a chain have a tensioning system to keep it snug and centered. This causes engine clatter when accelerating and the engine clicks as it hits the guides. Engine Rattling when Idle? I did a 3/4 turn on each bolt and rattling disappear just like that. It only occurs on the first start too. It’s most noticeable at idle. If there’s a little bit of wiggle room, the piston is going to rattle against the side of the cylinder wall. Whether it's engine knocking when accelerating or some kind of spark knock or just a general engine noise, some are more serious than others, but there’s one thing that’s true of them all: it’s never good to leave it alone. I was told it could be that the airflow sensor is not good anymore or the my car is making a rattling noise when idling. If a rattling sound is coming from directly underneath your car, that’s a strong sign that something is wrong with your exhaust system. I just heard your audio and it sounds line a clutch release bearing. But that core isn’t going to last forever. The good news is that yours is doing it at idle and those are relatively easy to find. We buy cars with major mechanical damage, such as engine issues, every day. It does not appear to get louder … You may need to sell a car with a blown engine at this point. 1 Reply. lovethosechips in Kansas City, MO on . Started getting this pesky rattle at idle. With the rattling noise comes additional vibration in the car. The catalytic converter is an emissions control component in your exhaust system. The sound had me checking the engine in fear of something serious. A basic oil change is the main prevention method. Here's What That Means. I don’t know how long its been rattling but I just noticed it the other day. Fixing your car may not always be the best option. If you have an engine pinging noise, it’s caused by engine detonation. Instead of trying to scrape together thousands of dollars for a fix, why not sell your car as it is? What are you waiting for? Obviously hard to explain what sort of rattle it is, but I get it once the car is warm and sits at a lower idle rpm. The noise sounds like it is coming from the top of the engine. The other main potential explanation is that your car has a cracked flywheel. ” If your car engine is making a rattling noise on startup, idle or when accelerating you could have a faulty serpentine belt tensioner, a loose bolt on the mounting bracket, loose timing belt, rusty or broken flexplate, faulty harmonic balancer, loose fan … Find out how much you can get for your damaged car now. It’s going to cost around $500 to $1,500 to replace the timing chain or timing belt tensioner. If the timing belt or chain tensioner loses its strength, the belt/chain has more movement than it should have. A loose center console cover, broken glove box hinge, or even an item resting in the door panel pocket or cup holder can suddenly start rattling at idle. The noise also only appears when it is warmed (engine running for about 3 - 5 minutes after cold start). Don’t get the stethescope probe caught up in anything spinning, and don’t lean on the exhaust manifold. The noise is present at the same rpm range regardless of gear (park/neutral, reverse, drive). Again, repair costs are varied depending on the size, style, and purpose for the engine, as well as the extent of the damage. Problem found and been corrected… Thanks guys for the feedbacks. No engine codes, no powerloss. as for the rattling sound have you checked the heat shield on the catalytic converter, mine was loose and was causing a rattling sound when it was at idle, and would go away as the rpm's increased. It’ll amplify the sound when you hit the right spot. There are guides for engines with a timing chain. The noise you hear is like a ball peen hammer tapping on a steel plate repeatedly. Accelerating? If they begin to rust away, they can rattle and tap, driving you to the mad house. We’ll give you a guaranteed offer. If something under the bonnet is rattling, it could be anything from problems with oil level to a bad fan clutch, so if the noise persists check the car into a garage. A hissing noise is another common sound drivers hear … It was loud and sudden but no effect on performance or feel. Get your guaranteed offer now. 1997 Grand AM, I have a rattle noise in the engine at idle. There is no difference between driving and standstill. Then, we’ll come get your car from where it sits, and we’ll take care of the towing costs. It's simple and it takes less than 90 seconds... click the button below to get started and find out how much your junk vehicle is worth! You may stay on top of engine oil fill ups and changes, but if a leak develops, it could reach a low level unexpectedly. Engine rattling when accelerating can be a symptom of a problem with this timing belt. It could be a couple hundred dollars of several thousand to fix it. The impact makes the wear worse too, coincidentally. If you want to know more about blown engines, we have an in-depth guide on blown engines for various makes and models throughout the years. Engine Knocking – Pinging – Rattling Noise – Common Causes January 5, 2020 Noises And Vibrations , Poor Performance Is your engine making an annoying knocking, pinging or rattling sound when you accelerate. Bolts are loose enough for the flange to move and hit each other and resonate at idle but tight enough and hard to notice when shaking it by hand or by kicking it. Rattling under car in idle / drive My 1993 190E has started to make some nasty rattling noises I noticed it tonight after dropping off a friend and my door was open. If I turn on the head light with D gear, the idle speed also becomes higher and the rattle sound is gone. Replacing an engine is nearly as expensive, so often it isn’t worth it to do either. An engine rattling noise, or a clicking sound in an engine, can spring up from a number of sources. Get an Instant Quote for Your Car. I’ve tried looking for loose components/screws/tubes, exhaustpipes etc. For the last two months my 2003 ford Taurus SE,makes a grinding noise while the car is idle,like while waiting at the stop light or while in park when the car is running. What happens is that fuel is igniting before the spark plug fires off. Be careful under the hood. Belt Tensioner Replacement. The most common engine rattling at idle isn’t an engine problem at all. If your car engine sounds like the bottom end is going to fall off, it’s probably engine rod knock. Re: Rattling/clicking sound at idle under car... (Audifollow) dosent matter what temp, the sound is from under the pass side seat area, I cant imagine thats the water pump, forgot to mention you cannot hear the noise from under the hood. I recently noticed that there’s a rattling sound when the car in in idle (800RPM) but it disappear when I rev it up to higher RPM or while driving. Hi There, Depending on the sound of the noise and where it is coming from, this may be something like a heat shield underneath the vehicle which is a part of the exhaust system. Engine makes rattling noise when car is at idle or when I make turns. Friday, December 23rd, 2016 AT 12:51 AM. SOURCE: 1999 Ford SVT Mustang Cobra and a rattling sound. CarBrain will give you a guaranteed offer for your less-than-perfect fcar, engine rattling and all. Depending on the cause, repair costs can shoot through the roof. Check out these reasons you could be hearing an engine rattling noise and what you can expect for repairs with these engine problems and diagnosis. Car makes rattling sound when idling (2000 Mercedes-Benz E320) my car makes a rattling sound when idling and it keeps get louder. It’s most alarming when the sound resembles a box of rocks shaking underneath your car when you’re idling at a traffic light or a stop sign. AC Hissing When the Car Shuts Off. 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