[OAC_Sparky]

NefCanuck,Jun 13 2007, 07:15 PM Wrote:Detonation is caused by either gas whose octane rating is too low for the engine (and which in this case the computer can't retard the timing far enough back to compensate for) or the engine computer itself is whack and isn't doing its job (A problem I had on an '85 K-car years ago, the engine computer was pooched and so the car wouldn't start w/o a boost and deiseled like crazy for up to a minute after shutdown :ph34r:)[right][snapback]241309[/snapback][/right]

Detonation can also be caused by running too lean, if the MAF sensor is dirty (and reports less airflow than actual) or the TPS is defective (showing a throttle position less than what it actually is).