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www.cargurus.com > Questions > Chevrolet > Cavalier
CarGurusDec 19, 2012 - And while driving loud thump when car motor shifts th... ... Bad throttle position sensor can trip both lights and make the transmission shift at high rpms and shift hard even under light acceleration. .... the transmission will shift hard when firstput into reverse or drive ... 2004 Chevrolet Cavalier LS For Sale.Missing: mitsubishi eclipse
Not sure on model but to me sounds like its a dodgey valve lifter when the seals start to go they cannot hold the oil and when there under pressure they basically empty them selves hence when you turn the engine off and restart you get a rattle sound untill the valve fills again as long as the cars running ok leave it untill you have to replace them unless there easy to do sone are sone are a pain
If it is indeed the pulley and not the compressor itself than all you have to do is pry slightly against the A/C clutchplate at equal and opposite spots( 3:00 and 9:00) this will bring the plate back to where it was upon assembly. Thank you, Dana P.S. if the clutch is making noise while the compressor is running than you've got to address that by replacing the compressor.
4.0l's are notorious for valve rattle on cold start-up. There is really nothing you can do to make it go away short of completely replacing the valve train in the top end, and that isn't a permanent fix. It's is an top end oiling issue from the factory. Just don't race your engine on cold start-up until the rattle stops.
The rattle in the transmission sounds to me to be more of a loose dust shield/heat shield around the transmission or exhaust than a mechanical issue.