Question about Chevrolet S 10

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My 1995 Chevy S10 sparks knock really bad.I have added some octane booster, but it still knocks badly.How can I adjust the ignition timing? I swaped the engine from a 2000 S10.I used the head off of the 1995 engine.Could changing the head make it spark knock? The truck runs good at idle.I am puzzled at this point!

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Did you upgrade or change your computer? ECM has a plate, I am a loss for the name, but that is programed to your old motor. You might check into that I can't think of anything else would cause that. Darrell S

Posted on May 30, 2010


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