There is a rattling noise that is getting louder coming from the motor area of the car at lower speeds what could it be?
It was soft at first but got louder. Our local mechanic replaced a piece of the exhaust system and it seemed to get less noticeable but now it is getting louder again. It's like a piece of metal is loose or something. Any clues?
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Re: There is a rattling noise that is getting louder...
IF this is occurring on light acceleration or when the motor is under load then it may be detonation in the combustion chambers . IT is from air/fuel ratio incorrect and ignition timing incorrect. Run the fault codes to check for codes associated with the air flow and the exhaust as the ECM is having difficulty adjusting the settings for the engine.
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it could be a wrist pin, and im not sure if those amc's had hydraulic lifters but sometimes with old lifters when the oil pressure is lower at an idle the lifters arnt filling up all the way so they develope a little valve lash, and when the rpms are raised the oil pressure raises and fills the lifters. you could try chasing the noise down with an automotive stethoscope.
You need to try and localize the area the noise is coming from, engine area, underneath of car or in the rear. Does the noise happen when car is standing still and gas is pressed? This kind of noise could come from a worn wheel bearing or differential.
i have the exact same problem ive got 2001 honda civic and have an annoying rattle from the wheel area. i have replaced cv joint, ball joint, sway bar drop links, strut, and suspension bushing and arm....but still rattle noise is there. dnt have a clue what it could be, from looking on the internet i have found few possibilities.....lower control arm/bushin...motor mounts....gear box mounts....strut rod bushing....axle....inner/outer cv joint....calliper pins......shock/shock bushing...or wheel bearing. im hoping tio get all this checked out its got to be able to be fixed somehow!
Check all the bolts and fastenings for the heat shrouds around the exhaust manifold to make sure they are there (and firm). If you can undo them without snapping them, take the shrouds off to check for gravel trapped in that area. It could also be a failing cat converter, but a lot less likely. My next step would be to remove the rocker cover and have a look......
Could be carbon build-up on the pistons, causing erratic flame travel in the combustion chamber... 'pinging'...... Decarbon the engine and use a high grade fuel for a few tanks.... also an octane booster can help