INSTRUCTIONS ON HOW TO
RESET THE LS1 ECM
This is intended to reset that aggravating 'Service Engine
Soon' light so many of us seem to see. The light is normally set due to a loose
gas cap or a high frequency error on the mass air flow sensor in front of the
intake manifold. If the light persists, you may want to have you car checked by
a GM dealer. It may be a good idea to remove your KandN air filter, and replace it
with the stock filter or equivalent before your visit to the dealer. Dealers, in
the past, have been known to blame the MAS error on excessive oil in the KandN
leaking onto the MAS. If the fuses aren't removed in this procedure, the codes
will be stored in the ECM until the fuses are removed, or the dealer clears them
with a scan tool. Rumors have it that stored codes retard timing and spark
ignition which will hinder the performance of you LS1.
1. Turn key on but don't start car.
It will take the car a while to relearn the fuel and timing
curves so don't worry about a temporary performance loss.
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