Question about 2004 Toyota Corolla

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Rattling, vibrating noise emitting from under the hood when cold, gets less as car warms up, but is still there.

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The bearing on the idler/tensioner is bad. Replace it and you be OK.

Posted on Dec 14, 2009

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1 Answer

When I first start my 2008 Honda Accord I hear a rattle sound under the hood after a few minute it stop


There are some good suggestions made on the Honda Accord forum: http://honda-tech.com/forums/honda-s2000-5/engine-rattling-when-cold-2444799/ Some say it could be chain tension and some say related to exhaust since the noise goes away when the car warms up.

I hope I have helped you!

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Rattling/groaning noise when cold in reverse


Motor or transmission mount/s may be bad .

Sep 03, 2017 | 1997 Toyota Corolla

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When I first start my truck I can hear a loud rattling sound coming from the back. Hear this sound also when I am in idle. Don't notice it when I pick up speed.


Check to see if one of your brackets holding the exhaust pipe has come loose. That'll make a rattling sound - especially if it towards the end by the tailpipe. When you're accelerating - more air is forced thru your exhaust at a faster rate, so it's not moving as much as when you're sitting still and the truck is just at an idle with less air/exhaust moving thru the tailpipe. If it's only making the noise while the truck is stationary & the noise stops one the truck is moving - that pretty much rules out anything to do withe the drive-train or suspension. You are sure the noise is from the back & not coming from under the hood? If under the hood - check your oil level ASAP.

Jul 29, 2011 | 2004 Ford Ranger

1 Answer

My Audi A4 2009 makes a rattling noise on cold starts which resolves in less than 30 seconds. Dealer says its an air pump. This doesn't seem correct. The noise comes from the front of the care. Does not...


READ THIS (happy ending so far...):
audi a4 2L turbo quattro, manual transmission with 98,000 KM. Perfect conditions, no oil leaks whatsoever.

Left the car off for two weeks in very cold weather (-10C down to -25C). When I restarted, it started immediately but with heavy rattling noise due to camshaft adjuster not getting enough oil pressure. After 3 minutes of warming up (outside temp.: -12C) at very low rpm (below 2,000rpm), I start moving the car. Still hearing heavy rattle noise. As soon as I pass 2,000 rpm, I get a scary red warning, low oil pressure. Turn off the engine immediately. In 1 minute, I re-start the car and the engine lights check ok, so I drive in first gear super slow (1,200rpm) hearing the same rattling noise. After another minute, finally the noise all the sudden disappears and the car starts running just fine.

Called Audi dealer and they told me that in extreme weather conditions, I should warm the engine for 10-15 minutes if necessary before start moving.
Take away: luckily, I didn't screw up the engine since I was using it at extremely low rpm (easy to do with clutch and manual transmission) until the oil reached full pressure. I am pretty sure now that the problem was leaving the car off for such a long time in freezing weather. All the oil flows back to the bottom, and when I restarted it, the cold oil with high viscosity took a long time to reach all the parts of the engine, specially the camshaft adjusters that are actuated by using oil pressure. Next day, the car started at -9C perfectly without making any noise (as usual). Basically, the longer you leave your audi in cold weather, the longer you might hear the rattling noise until the oil reach full pressure inside the engine. My car took 6 minutes to fix it after couple of weeks in cold weather. This makes sense to me; in fact, in the past I only heard the rattling noise after leaving the car off for a couple of days in the winter.
So far, this has had an happy ending....

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Dec 19, 2010 | 2009 Audi A4

1 Answer

I hear a rattling noise from the engine every time I start my 2006 Murano. The noise will disappear after a couple of minutes.


Quite often after a car has a couple of years on it, a piece sheet-metal, like a cowling, will work loose. The reason it quits is because your car warms up and starts to run smooth. To see what it is, you need to open the hood and then start the car and look and listen under the hood for what is rattling. Carefully push on each thing that you suspect is causing the noise. It will quit or change the noise when you find it. Remember your car is RUNNING and has spinning parts like the Fan Blade and Pulleys and Belts. Its starting to get cold outside so watch any loose clothing you are wearing when you
lean across the engine. If you find what is, shut the engine OFF, and see if it is something you can tighten or maybe replace. It is sometimes a very tedious task finding what's making the noise. Some times it is the engine itself that is the culprit. If you deduce that it is the engine it surely wouldn't hurt to have it looked at by a Pro.
Hope This Helps,
RSMITH972278

Oct 13, 2009 | 2007 Nissan Murano SE

1 Answer

A rattling noise from the engine bay


Check the heat shields on the exhaust system. They get loose from the extreme heat fluctuations work loose and rattle. Especially the one between the engine and firewall where the 02 sensor screws in. It probably rattles less after warm up because heat causes expansion which makes it tighter. Hope this helps.

Apr 05, 2009 | 2003 Toyota Corolla

1 Answer

Noise under hood like rattling sound


Try checking the heat shields on the exhaust pipe up front under the car. Alot of times they will loosen up, and begin to rattle. You can ither remove them, or try to clamp them.
Hope this helps!

Dec 17, 2008 | 1998 Hyundai Elantra

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