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1993 Grand Am 3.3L V6 (6-204) - Solved intermittent "Code 42 - electronic spark timing" issue by replacing Mass Air Flow sensor, after checking all wires in harness (and replacing some) between the ECM and ICM, check all connections, and replacing all the other sensors. All work prior to replacing MAF improved performance but did solve intermittent Code 42 problem. Never got a MAF sensor Code 34.
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what does P0650 mean on a 2001 buick century
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