National Firebird and Trans Am Club
North America's Oldest and Largest Club for all year Firebirds and Trans Ams including Formulas, GTAs and Firehawks!!                Established in 1984.

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Instructions on How to Reset the LS1 ECM
by Scott Haroff
this is an excerpt from the articles appearing in the EAGLE

also see upkeep and performance hints on our message board





This is intended to reset that aggravating ĎService Engine Sooní 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 arenít 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 hinder the performance of you LS1.

1. Turn key on but donít start car.

2. Pull PCM BAT and PCM IGN fuses in engine compartment.

3. Wait a few minutes.

4. Turn ignition off.

5. Replace fuses.

It will take the car a while to relearn the fuel and timing curves so donít worry about a temporary performance loss. Use these at your own risk as all disclaimers are in effect here.

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