Diagnostic Aids
WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
Check if fuel pressure is too high. PCM can compensate for some increase; however, if fuel pressure is too high, DTC will set. Check for leaking injector(s) or faulty fuel pressure regulator. See appropriate SYSTEM & COMPONENT TESTING article.
Check EVAP system for fuel saturation. Check MAF sensor. Disconnect MAF harness connector and see if rich condition is corrected. If rich condition is corrected, check for incorrectly installed MAF sensor or faulty MAF sensor. Check HO2S wires for breaks or contamination. Check TP sensor. See appropriate SYSTEM & COMPONENT TESTING article.