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Rattling noise when at low revs

When accellarating i get a slight rattle when at low revs but dissappears soon as i reach speed

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The rattling noise most likely will be detonation. That is spontanious combustion before the spark occurs. causes vary but wrong octaine rating is one reason ,spark timing another.if you have an efi car it could be at the timing sensor. or a distributor car the saprk advance is wrong. Some efi engines can't adjust to hot weather to well so the fuel setting go out. however be aware that you have to have this checked out as it can still occur at higher revs it is just that you can't hear it. End result will be holes melted in the top of the pistons

Posted on Jan 09, 2013

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Posted on Jan 02, 2017

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SOURCE: My Peugeot 206 has a rattle

Sound like pre-ignition problem. pre-ignition is caused by running too low an octan fuel in the engine. The way octane works is simply the lower the number the faster the burn. If the fuel burns before the piston gets to the proper position in the cylinder it can cause what is call in the industry a ping. The remedy is to use a highert slower buning octane fuel or change the ignition timing. Mind you some engines with higher compression may not like the lower octane fuel even after adjusting the timing.

Posted on May 05, 2009

  • 82 Answers

SOURCE: Loud rattling noise while accelerating

First thing i would try...... ISOHEET, Red bottle..... allows water to be mixed into the fuel and be burnt out of the tank.
get a good qaulity fuel injection cleaner, if you can locate the brand MALCO, i found it quite succesful..... and go with a full tank of premium fuel such as ammoco or shell......do not use yellow bottle of heet

Posted on Jan 22, 2010

Testimonial: "Might be water in the tank?"

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SOURCE: rattle when accelerating

had the same issue, had someone look and it seems the noise was caused by heat shield being loose covering exhaust system. Have that checked out.

Posted on Feb 07, 2009

  • 2 Answers

SOURCE: 04 Endeavor rattling noise

I had the same problem! I crawled underneath the car and discovered that a heat shield on the exhaust header pipe was corroded and rattling against the exhaust pipe. (Before the muffler)
I removed the portion and clamps and solved the problem. Give it a try.

Posted on Jul 21, 2008

  • 1 Answer

SOURCE: rattling sound in steering (at low speeds)

I sounds like you need to grease the intermediate shaft. GM sells a kit that consists of a plug and a bag of grease for around $18. It has been a few years since I bought it so the price could have went up. They also offer an update shaft for around $100. I am nearly 100% sure this is your problem. I have a 03 Yukon and have done it 3 times in 120,000 miles.

There are a few other posibilities, but they are not so cheap. The next logical problem could be the power steering pump or the valve in the gear box.

Posted on Mar 07, 2009

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1 Answer

Rattling noise , engine noise, that accelerates while increasing speed.


if this is under the hood (front of car), it could be an exhaust heat shield that is either corroded loose or a fastener has come loose. Does it happen when you rev the engine in park? if so, either have someone rev while you watch for whatever is rattling or have them watch while you rev.

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Engine rattle at idle or low revs


What kind of vehicle ? Which engine? Need more info.

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2005 Mercury Grand Marquese accellarator not accellerating motor


Check idle speed, air flow speed, oxygen sensors . Check fuel manifold pressure. If the engine runs ok but will not rev up check the cat converter by hitting with the heel of your hand and listening for rattles as they are prone to failing and blocking up the exhaust system which stops the motor from accelerating

Feb 15, 2013 | 2005 Mercury Grand Marquis

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

98 Ford Explorer engine/exhaust noise


When catalytic converters go bad, the porcelain matrix inside comes loose and is noisy.
But you can just unbolt it, break up the loose chunks, pour out the pieces, and it will run better than ever.
If you don't pass the next emissions test, then replace it.

But it could just be the heat shield rattling instead.
Take the shield off first, to see if it goes away.

Jan 03, 2010 | 1998 Ford Explorer

1 Answer

Loud rattling / buzzing noise from engine when cold not seconday air pump or air valve as already replaced.Timing belt,water pump and aux pullies all checked and ok.The colder the weather the louder the...


If the rattling changes with the revs of the engine, it might be that the valve compensators are either worn or not getting enough lubrication. 20V engines have quite small oil passages travelling to the head. They tend to clog up with gunk if the oil change is not frequent enough.

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My Fiat Brava SX automatic rattles at low revs,


Have the catalytic converter heat shield checked. Sometimes they vibrate loose and caus strange rattles or buzzing noises.

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2 Answers

Same rattle and noise


this is easy one if you put the a/c on do you hear the rattle if yes then shut off the a/c if the noise go away then it is the compressor

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