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99 grand prix gtp stalls


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wellsey006
New User

Dec 12, 2009, 11:29 AM

Post #1 of 5 (2430 views)
99 grand prix gtp stalls Sign In

99 grand prix gtp 3.8 sc,car will start and run when cold as soon as it get to operating temp it stalls and will not start again till it cools down,have done the fuel pump resistor bypass test with no results,no codes are showing up to read ,did a fuel pump pressure test and checks out normal,anyone have any idea?Thanks


(This post was edited by wellsey006 on Dec 13, 2009, 12:58 AM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 12, 2009, 12:43 PM

Post #2 of 5 (2425 views)
Re: 99 grand prix gtp stalls Sign In

  All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.



Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.


2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.


3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



gmcnabb
New User

Aug 9, 2010, 12:39 PM

Post #3 of 5 (2337 views)
Re: 99 grand prix gtp stalls Sign In

Maybe the Idle Air Control valve is malfuntioning.


re-tired
Veteran / Moderator
re-tired profile image

Aug 9, 2010, 12:49 PM

Post #4 of 5 (2334 views)
Re: 99 grand prix gtp stalls Sign In

The maybe game can get expensive quick. Maybe this maybe that. Do as HT has recommended . A set by step peocess of elimination.


LIFE'S SHORT GO FISH


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 9, 2010, 1:43 PM

Post #5 of 5 (2328 views)
Re: 99 grand prix gtp stalls Sign In


Quote
Maybe the Idle Air Control valve is malfuntioning.


That will not prevent the car from starting.
As you were advised in the last post you made blaming the IAC for a "no start", this question is nearly a year old. Please stop posting to old questions.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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