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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 K&N 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 K&N 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. Return to NFTAC Tech Tips Page
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