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Car wont stay running
1991 Pontiac Firebird

Car wont stay running

(1991 Pontiac Firebird)
car wont run have changed all the sencors under the hood and the fuel pump and it wont stay running
2 answers & 0 comments
Popular Answer
on June 20, 2010
There is a Crank Sensor that has to be 'seen' by the Engine Computer, or it will not turn on the fuel pump, there is also a low oil fuel pump cut off switch on the oil pan, ( on some Firebirds of this era ) so if that is defective it will not allow the fuel pump relay to energize the fuel pump. Best to check for codes, do a data scan of your ECM to see what is working and what is not when you are cranking the Engine. Do you have Spark and Injector pulse? If not, this could also be the Crank Sensor or RPM Sensor.
here is a link to the Repair Information for your car:
http://bit.ly/mitchell_repair_manuals_online Go over the fuel system schematic carefully.
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General Diagnosis
$88 - $111 Learn More
on June 20, 2010
There is a Crank Sensor that has to be 'seen' by the Engine Computer, or it will not turn on the fuel pump, there is also a low oil fuel pump cut off switch on the oil pan, ( on some Firebirds of this era ) so if that is defective it will not allow the fuel pump relay to energize the fuel pump. Best to check for codes, do a data scan of your ECM to see what is working and what is not when you are cranking the Engine. Do you have Spark and Injector pulse? If not, this could also be the Crank Sensor or RPM Sensor.
here is a link to the Repair Information for your car:
http://bit.ly/mitchell_repair_manuals_online Go over the fuel system schematic carefully.
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I had this same problem, it turned out to be the ( VATS SYSTEM) Vechile antitheft system. replaced it .
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