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#1
10-29-2006, 08:21 PM
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thumping sound
When I crank my 93 vr4 and let it warm up, if I get behind the car near the muffler i hear a thumping sound. Its as if I have a subwoofer on in my car, but its coming from the muffler. Its kinda like a backfire but just a thump. no cel comes on? been doing this since i bought it
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#2
10-30-2006, 12:12 AM
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Re: thumping sound
does it backfire at all when you rev it up?
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#3
10-30-2006, 12:31 PM
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Re: thumping sound
If it's just happens every so often at idle I wouldn't worry about it... Every engine misfires a certain percentage of the ignition... That is actually why all cat converters are 3 stage and how the bulk of the hydrocarbons end up on the exhaust...
You can help to eliminating it (in no particular order) by: 1) playing with your spark plug gap 2) buying better wires 3) buying new injectors 4) buying an aftermarket multi-spark ignition system But even then it potentially will not eliminate the "thump"... It really depends on how bad the misfire is...
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