Engine rattling is never a good sign. However, there can be many different causes. If it rattles when idle, it can mean something completely different than engine rattle while accelerating.

Depending on the cause, repair costs can shoot through the roof. Read more below to find out what the problem could be. Get paid quick in as little as hours! An engine rattling noise, or a clicking sound in an engine, can spring up from a number of sources. There are a whole bunch of reasons you might be hearing your car engine making noise. 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.

Engine damage costs are among the highest when it comes to automotive repair. We buy cars with major mechanical damage, such as engine issues, every day. Find out how much you can get for your damaged car now. As the engine spins inside, the timing belt or chain needs some guidance, especially as the engine revs climb. Engine rattling when accelerating can be a symptom of a problem with this timing belt.

There are guides for engines with a timing chain. Both vehicles with a timing belt or a chain have a tensioning system to keep it snug and centered.

Q: My car is making a loud rattle sound when idling and in neutral

This causes engine clatter when accelerating and the engine clicks as it hits the guides. This will definitely be a loud engine noise when accelerating, so it should be easy to notice.

Left alone, the timing belt could skip or break, causing your engine to not run due to engine failure. Plus, who would suspect the out-of-sight flywheel or flexplate would be the issue? The flywheel is fastened firm to the engine crankshaft, and the transmission engages it as you begin to drive. If the flywheel or flexplate is cracked, it bends slightly as you accelerate due to torque. It strangely disappears as soon as you let off the gas, and you might not hear it at all on light acceleration.

If the flexplate is cracked, the transmission needs to be removed to replace it. You may need to sell a car with a blown engine at this point. The catalytic converter is an emissions control component in your exhaust system.

Its honeycomb-style core superheats unburned gases in the exhaust before it leaves the tailpipe. When it begins to break down, little chunks break off and rattle around inside. What is spark knock?I recently fixed the brakes on my car, and now my car is making a loud rattle sound when I am idling, and also when in neutral.

The car hasmiles on it. The RPMs also drop while it is rattling. When I shift into first gear, the RPMs pick back up and the rattle goes away.

I have heard that this model has a heat shield rattle, but it is winter where I live. I am assuming since it is affected while idling, it is related to the engine or transmission. Any thoughts? There are several causes for the engine to rattle while idling.

With your car, the heat shield or an under engine shield is most likely. The other causes are the AC compressor clutch, idler pulley, or belt tensioner. The heat shields are used between the exhaust and the underside of the vehicle to keep the vehicle cool and the heat from the exhaust directed out of the tailpipe.

When the heat shields become loose, they can make a flapping noise when the vehicle is moving. To verify this, a qualified technician, like one from YourMechanic, will be able to diagnose the rattle and replace your heat shield if necessary.

Q: My car is making a loud rattle sound when idling and in neutral asked by Liam B. Spencer Clayton Automotive Mechanic. Thank Spencer. Was this answer helpful? Thank you for your feedback! Sorry about that. Why wasn't this information helpful?

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loud engine noise idle

Please see our terms of service for more details. Related Questions. Same suspension part keeps breaking by Alexandra R. Won't start. Replaced starter and relay switch, still won't start. Tested battery and it's good. Home Questions. Year I don't know. What others are asking Is a clunking noise at 20 mph a sign that a mount is broken?

Thank you for writing it. A clunking noise can absolutely be a transmission mount that has failed.East Frontage Rd. I SturtevantWI I apprec They purchased my junk car and I could not be happier with the prompt, professional sevice. They mad Strange engine noises are bad news.

Do not ignore them—get it fixed or try to make DIY repairs. The unfortunate truth is that engine noises can mean anything from a simple quick-fix, to a complete engine overhaul that may not be worth the money if your car has some gnarls in its beard. This quick guide seeks to point out some of the most common engine noises and explain what causes them.

You may simply need to make an adjustment or two without ever having to take your vehicle into an overpriced mechanic. There are several different car makes and models that are renowned for having engine issues. Aside from engine issues, we also accept cars that are:. Auto issues got you downright frustrated? Don't wait another day - call our vehicle parts dealer at Sturtevant Auto today!

You may be able to pick up some cheap engine parts from Sturtevant Auto near Milwaukee, WI and make some simple repairs on your own. When you accelerate and hear a squeal, a squeak, or a whine, odds are the cause is a worn belt. Your timing belt might whine while idling, and actually stop whining after you continue accelerating, only to return once you slow down.

It can be caused by:. A quick stop to the mechanic should easily clarify the cause of the problem. They might offer to fix it then and there, but you can save yourself money by fixing it yourself. Replacing a timing belt is pretty straightforward in most models, but depending on what you see under the hood, it could be problematic.

If your engine makes a pinging or knocking noise it is likely caused by an ignition problem.Eddie spent 35 years in the automotive business with Honda. Some engines have a normal ticking noise caused by electrical components like injectors, relays, and solenoids, and also the engine itself makes some noise turning thousands of RPM's revolutions per minutebut for the most part, engines should generally have only a very soft ticking noise with no knocking noise.

If your engine develops a knocking noise while driving, usually it's quickly followed by a red or amber warning light on the dash notifying the driver there is a problem. If the light is amber, I recommend taking it easy until you reach a garage or service station, amber means CAUTION and the noise and light should be checked very soon by a reputable mechanic not your cousin, unless they have a mechanical background.

If your engine develops a ticking or knocking noise in a short period, the first thing you should do is shut off the engine and check the oil level. You'll need to find the engine oil dipstick and see if you need to add oil or if the oil level is up to the full line.

If you cannot find the dipstick, ask for help; don't chance driving without checking the oil level first. There are several reasons the oil level in your engine may be low. The most common cause is an oil leak. If you suspect you have an oil leak, check the ground where you usually park your car: most often you will find several drips or small puddles of oil on the ground or garage floor.

Q: My car is making a loud rattle sound when idling and in neutral

If you cannot see any signs of leaks on the ground or garage floor, try placing a large piece of cardboard under the engine overnight and check for leaks in the morning. This method usually verifies an oil leak clearly without any questions.

I created this video below of some typical engine ticking and knocking noises. Deeper knocking noises are from below where the crankshaft is located.

Worn crankshaft and connecting rod bearings are the usual cause of lower-pitched, deep knocking noises but are not the only parts that can cause these types of noises. I had a vehicle in the shop that had a blown timing belt tensioner see aboveand this was a very heavy deep noise, so you just never know what is making the noise until you have a knowledgeable mechanic check it out. Below the video are some pictures of a normal camshaft and another one that is worn causing some noise.

How to Fix Engine Noises

If you don't see any visible external engine oil leaks, it's possible you are leaking oil internally. There are lots of possible sources of internal engine oil leaks like piston rings, valve guide seals, gaskets, and o-rings. If your engine is burning oil past the piston rings or valve guide seals, the usual sign is blue smoke exiting the exhaust pipe, some when the engine is idling and more when the engine is accelerating.

There is another type of internal engine oil leak called a head gasket leak. In some cases, the head gasket can leak engine oil into a cylinder, again causing blue smoke out the exhaust; it can also leak coolant into a cylinder and cause thick white smoke out the exhaust.

One other possibility is coolant and oil mixed together internally causing a milky mess either in the oil pan or radiator.

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This type of leak is very noticeable: just pull the oil dipstick, or look in the coolant overflow tank, and if you see any contamination that looks like chocolate milk, you have found your problem. If your oil is dark brown or amber, and your coolant shows no signs of oil mixing, but you still think you may have a possible internal engine oil leak, top off the oil to the full line on the dipstick, then check your oil level every miles and document your findings.

Note: If the oil level is low when checking it after miles, top it off again and recheck it in another miles, this will give you an idea of how much oil you're losing or burning. Once an engine develops a noise like this, there is no easy fix. Typically, you'll need to dig deep into the engine to either fix the noise by replacing internal engine parts camshaft or crankshaft or replacing the complete engine.

Once an engine runs low on oil to the point where the engine makes noise, it's usually too late; the damage is done.Doesn't seem to be exhaust Ptcruise answered 4 years ago. Kelly answered 4 years ago. I thought maybe it was just at startup in the morning, as its been pretty cool the last few days. No need for new or more oil, oil levels at max. Exhaust noise doesnt sound louder when idle or driving.

Not sure what other info to give.

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GuruL3X49 answered 11 months ago. Car idles good and runs well but it's just kind of loud and noisy on acceleration. Car engine noise is extremely loud especially after reaching 50 mph. What should I get checked? My pt cruiser suddenly started to run rough. The engine light came on and started flashing.

Then it died and would not turn over or start. I replaced a broken fuse for the fuel pump and insta I hit a deer and now the engine has a rough idle. Ive changed right motor mount, spark plugs, alternator, and fixed air leaks. I have a PT Cruiser and I can not get it to idle.

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I have checked wires, plugs. Cleaned the throttle body still no luck. I replaced the Cam sensor about a year ago. I am looking for ideas. Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus.

Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies. Loud Idle, not roughHome Articles Engine Noises How to Fix Engine Noises Abnormal engine noises are trying to tell you there is a problem Today's car engines are designed with more complexity and moving parts than ever before.

When you hear abnormal noises there is something wrong. Some high output engines have short skirt pistons or roller valve trains so a minimal amount of ticking is normal when the engine is at idle.

Fuel injectors also make a slight clicking noise when the engine is idling as well.

loud engine noise idle

These noises are normal and no repair is required. If unexplained noises exist the steps below are the most common causes. Abnormal engine noise is due to excessive clearance between two internal metal parts that should have little to no clearance. This clearance can be due to many things from a broken valve spring to a crankshaft bearing that has failed. The first step is to identify where the engine noise is being generated.

With the engine running isolate where the noise is coming from in either the the upper half, lower half, front half or rear half. Listen from above and below the engine as this will help determine where to start looking for the cause of the noise. An engine depends on clean oil to lubricate the internal moving parts.

When the oil level is low or dirty it can cause the lifter to malfunction which will allow excess valve train clearance creating a tapping or clicking noise. For example: A valve lifter is responsible for holding valve train clearance to a minimum. In extreme cases it can cause one of the many bearing surfaces to fail causing permanent engine damage. An engine making a slight noise changing the engine oil and filter with the manufacturers recommended weight oil will help.

A squeaking noise is generally created by the engine accessories, accessory mounts, serpentine belt or drive pulleys. When an accessory such as the water pumpalternatorpower steering pumpserpentine beltserpentine belt tensioner or idler pulley has failed it can make a rattlingsqueaking or tapping noise.

These sounds are centrally located near the front of the engine. With the engine off check the tension of the serpentine belt. It should be at medium tension. A loose or worn belt can make a loud squealing or chirping noise.

Check the belt tensioner and the size of the belt to make sure the right belt is installed. To isolate the origin of the noise remove the serpentine belt and start the engine to see if the noise is still there.

If the sound disappears one of the above items has failed.

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With a flashlight inspect the brackets and pulleys that connect the alternator, air conditioner compressor, power steering pump, and alternator.Just out of curiosity, why do some cars idle so much more loudly than others? I have a neighbor who has been idling his car for over an hour at a time recently, though since I complained to the association, he has idled it only for 10 minutes once.

I am pretty sensitive to noise and this car is really loud. Some people idle their cars in cold weather for a few different reasons. They may simply want to bring the vehicle up to temperature so they have cabin heat when they drive off. They may be too lazy to scrape frost off their windows, so they warm the car up so the frost melts and they can see without having to spend two minutes scraping frost off their windows before leaving.

Extended idle time will not ruin an engine in the short term, although it could dilute the oil with gasoline, causing ring and bearing damage in the days before electronic fuel injection. As to why some cars idle louder than others, a couple of explanations come to mind.

Some cheap compact cars had rather gritty sounding engines older Escorts and Accents come to mindand this grittiness is often considered noisy. If this is an old junker, the car could also have a broken exhaust pipe, causing a leak and a lot of noise. The HOA will often also have rules prohibiting residents from owning vehicles that are not in good repair.

More than likely, you have a neighbor who owns a sports car with an aftermarket performance exhaust system on it.

loud engine noise idle

These systems are frequently designed to produce more sound than the original system, which is considered a good thing by the people who buy and install them. As far as talking to your neighbor about it, they may actually appreciate you dealing with them directly rather than going over their head and trying to get them in trouble with the HOA, as long as you are polite and civil about it.

Driving a loud car does not mean the owner is dangerous, or even inconsiderate. There is a My truck is pretty loud since I just installed an aftermarket muffler on it, but the only reason I could be dangerous to someone is if they are posing a direct threat to my well-being or the well-being of my family, certainly not for someone complaining to me that my truck is too loud.

Loud Idling? I dont really know that idling has any affect on the tone of the exhaust… Does the car have a loud exhaust to begin with? It must as idling would be no louder than the cars normal sound emissions when running.

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Who knows what you may be describing…sometimes the buildings that the car is in or around may amplify the sound of the vehicle at idle…like some sort of harmonics issue at idle…but like I said the car prob has a loud exhaust system to begin with methinks…. While there are a lot of design variants that go into how an idling engine sounds, there are Department Of Transportation regulations governing the noise levels of over-the-road vehicles.

Loud vehicles are generally the result of a worn out or modified exhaust system, sometimes in conjunction with a modified engine. Regarding idling damaging a modern engine, it will not.

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This was necessary because carburators have a difficult tine creating a sufficient surface-area -to-volume ratio, and good surface area to volume of gas is important for effectively accessing the power contained in the gas with minimum emissions In addition, engines ran colder, exascerbating the problem. Thermostats used to be typically F, about 30 degrees colder than they run now. Thus, engines put out a lot more gas that wasn;t fully burned.

The not fully burned gas became carbon deposits and could build up on valves, piston heads, and cylinder head surfaces. In addition to affecting the ability of valves to close fully, and causing spark plugs to not fire properly, these carbon deposits could retain heat, causing preignition problems.