1991 Pontiac Grand Prix help!

IZZYSBACK2007

MEMBER
1991 PONTIAC GRAND PRIX
6 CYL
FWD
AUTOMATIC
170,000 MILES

I am having a really hard time getting my preowned 1991 pontiac grand prix se 3.1 liter running and on the road! It would run for about five minutes and stop as of a day ago. I read an article about replacing the crankshaft position sensor which ive done!The old sensor is cracked and no good!Now it barely even starts!I have replaced plugs, wires, air filter, ecm was checked, coils where checked, ignition module was replaced before the CPS was switched, I put a new gas filter, main gas line from tank to filter and I replaced the old fuel pump! I have also put in both a new battery and a new alternator. Is there another sensor or related wire that could be the problem? PLEASE HELP ME SOMEONE! IVE SPENT 2000 ALREADY ON THIS PROJECT AND RIGHT NOW ITS SCRAP METAL!

3 Replies

MMPRINCE4000

MECHANIC
8,548 POSTS

Are you getting any error codes (check engine light)?

If so get the codes and post, if not then start with basics, check fuel pressure with mechanical gauge and test spark with spark tester, also check injectors with a noid light.

Also make sure you replaced the crank sensor with correct one, and remove connector to CS (disconnect negative battery cable first) and clean with electronics cleaner (comes in spray can).

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Sunday, April 19th, 2009 AT 7:58 AM

IZZYSBACK2007

MEMBER
1 POST

Part of this journey includes a 300 dollar bill to a guy who said he worked 8.5 hours. He said he swapped out the ecm and that the car ran different but not right so he put the original back in. He said he replaced a coil pack. He said he checked the wiring to the injectors and that the injectors where okay. But his conclusion was that it was something in the wiring and that it would take quite a few hours to try to fix it! Which I wasnt willing to pay for him to hope to fix it. He said it gave off a bunch of codes but needless to say he wasnt kind enough to write them down for me. Is there a place (auto zone maybe) that would have a free tool rental service so I could get the tools you mentioned and do this myself?

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Sunday, April 19th, 2009 AT 6:17 PM

MMPRINCE4000

MECHANIC
8,548 POSTS

My best advice (if you intend to work on car yourself) is use car repair manual link in this thread or get a Haynes manual.

You can retrieve the codes yourself, by shorting terminals A and B of the diagnostic port (called ALDL).

The check engine light will flash the codes.

Autoparts stores will scan OBDII codes (96 and newer). This is an OBDI ECM.

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Monday, April 20th, 2009 AT 7:59 AM