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Re: 2004 cavalier - Please Help
You'll need something more advanced than a simple code reader to diagnose a problem like this. Even something like a scan gauge (scangauge.com) is better than what you have. I don't really care for it as a diagnostic tool, I only bought it for the extra gauges (but they're cheap). It has a limited datastream that will show about 1/16 of all the info available from the PCM, and can be programmed to read anything in the PCM (but isn't capable of any other modules). It comes programmed with ECT, IAT, RPM, TPS, vehicle speed, MAP, timing advance, and maybe a dozen other things that I've never had a use for using it only for the gauges.
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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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