Pontiac Repair: 1999 pontiac grandam 3400ho engine, pontiac grandam, water corrosion

Question
eng. will start, but will not continue to run after releasing
key from start position.

Answer
Hi Garry;

when it stalls out does the security lamp on the dash start to flash or stay on steady? If so the factory anti-theft syetm has a fault in it. If that is the case it's usually 1 of 2 things either the sensor in the ignition lock housing failed or the BCM (body control module) has water/corrosion in it. My guess would be the housing is bad. when it stalls out and the light flashes (if that is the case) leave the key in the run position for 10 minutes untill the lmap stops flashing and or goes out. then turn the key off wait 1 minute. then try to restart the car. if it starts anf runs it need the housing. when your in that 10 minute wait period make sure all the accy's are off like blower motor and radio and leave the car doors shut to make sure the battery doesn't die. good luck :-}