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

6 Answers

79,135

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

5,115

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 people found this helpful.
Best Answer Mark helpful
79,135

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 people found this helpful.

I just don't know what to do

15

The problem on my 2003 Grand Prix GTP was the Camshaft Position Sensor. The engine was dying in stop and go traffic. It also died when I'd come up on a red light and take my foot off the gas. The CPS degrades over time from heat issues. It doesn't throw codes when the car dies. There is no test for it. The car runs after a restart but can die in traffic without warning. I had the CPS replaced at an independent shop because the dealership couldn't see it throwing codes, which it doesn't. I basically had to tell them I had already determined what the problem was and I just wanted them to replace the sensor for me. They did and it has run like it's brand new ever since. Best guess I ever made with a car. It was mentioned on another string on this site but I don't remember where I saw it. Good luck.

Your Answer:

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 1,756 nationwide Grand Prix listings starting at $800.

ZIP:

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,710
  • #2
    Tom Demyan
    Reputation
    3,290
  • #3
    munron
    Reputation
    2,830
View All

Related Models For Sale

Used Chevrolet Impala
375 Great Deals out of 25,636 listings starting at $950
Used Pontiac Bonneville
324 listings starting at $1,900
Used Chevrolet Monte Carlo
4 Great Deals out of 940 listings starting at $2,950
Used Pontiac Grand Am
719 listings starting at $1,900
Used Ford Mustang
266 Great Deals out of 37,717 listings starting at $1,350
Used Chevrolet Camaro
237 Great Deals out of 27,288 listings starting at $2,077
Used Chevrolet Malibu
489 Great Deals out of 51,427 listings starting at $1,995
Used Pontiac Firebird
6 Great Deals out of 682 listings starting at $4,700
Used Buick Regal
85 Great Deals out of 3,942 listings starting at $5,300
Used Nissan Altima
741 Great Deals out of 66,559 listings starting at $1,499

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
272 listings starting at $3,995
2007 Pontiac Grand Prix For Sale
257 listings starting at $2,000
2006 Pontiac Grand Prix For Sale
6 Great Deals out of 295 listings starting at $1,495
2005 Pontiac Grand Prix For Sale
3 Great Deals out of 223 listings starting at $1,500
2004 Pontiac Grand Prix For Sale
262 listings starting at $950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.