97 grand prix gtp wont start

Asked by Jan 29, 2014 at 11:48 PM about the 1997 Pontiac Grand Prix 4 Dr GTP Supercharged Sedan

Question type: Maintenance & Repair

I have a 97 gtp that instantly died on the highway going 70
mph. The steering went tight along with the breaks being
harder to press down. It had a half a tank of gas. Car has
175k miles. Ive checked for fuel which its getting. The fuel
pressure was 60 psi on first crank then lowered down to 55
psi. A mechanic had told me it was probably a fuel pressure
regulator before I tested the pressure an since there not to
expensive I bought one an put it on. Well the car still wont
start so I tested my plugs and coils for spark which they all
have. Before the car died there was a code thrown for a faulty
o2 sensor but ive heard that an o2 sensor wont cause a no
start issue. Im leaning towards possibly a bad injector or bad
throttle positioning sensor? I had to replace the tps about 6
months ago an when I installed it something went wrong an
it was catching inside at the wrong moment so it was taking
an extra long time for my car to shift so I took it off an put it
back on correctly an has been working since but im
wondering if I ruined the spring an the tps failed early. I just
dont understand how it was running fine on the interstate for
an hour an a half an it just died? Any ideas would be very
greatly appreciated. Thank you

4 Answers

68,375

Check the crankshaft position sensor and the camshaft position sensor. These are known trouble spots on these cars and if one or the other fails the car won't run. Also run a compression test. If all cylinders test low it's jumped timing. A real possibility for an engine with 175,000 miles on it. As for the steering and brakes, when the engine stalled you lost power assist for the power steering and the power brakes. That's normal and nothing to worry about. HTH. -Jim

Ive heard that if the crankshaft position sensor is bad the car wont have any spark at the plugs? Is that not true. Thats the only reason I havnt checked it because my car has good spark plus brand new plugs an wires as of 6 months ago

4,645

You can have spark, but if the spark isn't happening near TDC or the cam has jumped timing, the engine won't run. Jim (Js08016) suggested the right things to check. Good luck!

1 of 1 people found this helpful.
Best Answer
68,375

Norn is right as well. For an engine to run you need air, fuel, spark, and compression. Those are the basics. Sounds like you know you have air, fuel, and spark. Since it won't run you need to determine if you have compression. I'm betting you don't. I once had a '68 Cadillac that jumped timing while I was waiting for a traffic light. No noises or anything, it just stalled and wouldn't restart. I checked that I had fuel and spark. I did. So I ran a compression test. Then the tale was told. All cylinders tested below 100 PSI. so I knew it had jumped timing. HTH. -Jim

1 of 1 people found this helpful.

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