Question about 1998 Pontiac Grand Prix

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My 1999 Pontiac Grand Prix GTP is not starting, the fuel pomp is working and you can hear it go on when you insert the key, my key does no have the chip in it, so im guessing is the anti theft, i replaced the crank sensor and the spark plug module and i also took the computer of the car to get tested and they said it was working properly so my only other option is the anti theft, i wil like to know where de module is located and how to disable it. THANKS!

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If you replaced the crank sensor and it will not start then your car needs a CASE learn. Once the crank sensor is removed and a new one is installed, without a lot of luck it is highly likely that the sensor will be out of range to properly detect your crank position and send the info to the PCM so proper ignition timing can be calculated and executed from any given piston position left at vehicle shutoff. A CASE learn is a procedure that will calibrate the new sensor to correlate with crank position. Without it, your car will not run. It can be done with most TechII compliant scan tools with the capability. You may be able to rent or buy a used one to get you up and running again, it's a simple procedure it should take only about ten minutes.

Posted on Apr 23, 2011

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Posted on Jan 02, 2017

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Are all fuel pumps from 97 Pontiac grand prix compatible with fuel pump for a 97 Pontiac grand prix GTP super


No.
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1998 Pontiac Grand Prix GTP Starts and turns off approx 5-10 seconds after starting.


I would replace the TPS sensor. If you have fuel pressure enough to start the car, then you probably have pressure always. Before turning the key to start, turn to ON. You should hear the fuel pump pressurizing the lines. Turn the car back off. Go under the hood and remove the cap to the Schrader Valve. Use a rag to catch any fuel when you depress the valve stem. If fuel comes out into your rag, you should have pressure. Try this a second time to be sure. I had this issue with my car shutting down. TPS sensor replacement fixed it. BUT...it could be vacuum lines, or another sensor fault. The TPS is a common issue. You may also want to clean your Mass Air Flow sensor with the proper solvent and technique.

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1 Answer

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Jul 27, 2010 | 1999 Pontiac Grand Prix

1 Answer

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May 09, 2010 | 1999 Pontiac Grand Prix

1 Answer

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Maybe weak fuel pump. It pumps when you turn the key on (fills fuel lines) but it dosn't pump enough to keep the car running. Could also be a partially cloged inline fuel filter.

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