Re: Diagnosis - Check Engine???? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Diagnosis - Check Engine????
Posted by Gforce (more from Gforce) on Tue, 21 May 2002 16:24:22
In Reply to: Diagnosis - Check Engine????, Theo, Tue, 21 May 2002 15:19:43
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Sounds like your engine entered over boost. Most likley caused by a defective BPC valve. The roughness you encountered was the ecm shutting off fuel to the injectors due to too much boost pressure. The flashing check engine lamp came on because the computer detected a cat damaging misfire caused by the fuel shut off. The light came on steady after everthing returned to normal. The control unit cannot determine what caused the misfire,(spark, air or fuel) only that one or several have occured. BTW, OBDII regulations determine when and how the check engine lamp comes on, and goes out.
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