Question about 1991 Buick Park Avenue

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Check engine light

1991 Buick Park Avenue-replaced ECM then Crank Position Sensor. Solved starting problem but now check engine light is on. Is this just a reset due to these repairs or is there a potential problem. Car seems to be running fine.

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Check all of the connections to the ECM--twice.

Be sure the four-letter code on your replacement ECM matches the one you removed.

The ECM relies on calibrations performed on some sensors while at the factory. For that reason there may be a switch or a sensor that is reading out of range.

If it seems to be running fine, drive it for a while and get an accurate measurement of MPG. Poor MPG will indicate that things like O2 sensor, MAP/MAF, TPS, IAC, IAT are not reading properly. Check for codes with a OBD-I reader.

Posted on Sep 29, 2008

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