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Re: 97 2.4 cav sounds like a diesel engine
Is it actually dieseling (pre-ignition), or is it just the higher pitched part of the sound? Kinda like the tapping/ticking/rattling? I have a 98 G/A with the same engine/problem, and I'm pretty sure it's a problem with the intake camshaft/bearing(s)/tappet. Listen around with a stethoscope (or lacking one, a screwdriver) and see where the noise is the loudest. In my searching, I found that a cracked flexplate/flywheel can make a similarly described sound, should check that out too.
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'04 Cavalier coupe M/T 2.2 Ecotec
Supercharged 14 PSI boost, charge air cooler, 42# injectors
Tuned with HP Tuners
Poly engine/trans/control arm bushings
Self built and self programmed progressive methanol injection system
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