1998 Pontiac Grand Prix car just stalls

Tiny
FALAYME
  • MEMBER
  • 1998 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 205,000 MILES
I recently had my car stall on me while driving. When u would try to start it, it would turn over then die. I replaced the mass air flow sensor, throttle position sensor and idle control sensor. The car worked fine for about a week but has begun to do the same thing again. Sometimes it will turn right over and stay running but other times u have to wait a few minutes before it will stay running. Sometimes it will run fine after that other times it will only make it a few blocks. Not sure what else to change or what else to check. In order to get it to stay on sometimes u have to keep your foot on the gas
Friday, July 2nd, 2010 AT 7:31 PM

16 Replies

Tiny
INTERNETMECHANIC
  • MECHANIC
  • 700 POSTS
Any applicable trouble codes? Take the throttle-body off and clean it, check the iac, idle air control. Use a gage and check fuel pressure.
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Friday, July 2nd, 2010 AT 8:42 PM
Tiny
FALAYME
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Just placed iac and mass air flow and throttle position already checked fuel pressure and there are no codes as I dont get a service engine light
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Saturday, July 3rd, 2010 AT 7:30 AM
Tiny
INTERNETMECHANIC
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Maybe your security system? Do you have passlock? If you have to hold the throttle open a little to get it to idle, sounds like the idle system?

I always check for codes, even if the lite isn't on, probably because that is the first thing listed on my scanner index. Does that lite ever come on? It should when you first turn the key on. Any sensor/s you suspect, you should check the wiring circuits, first.
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Saturday, July 3rd, 2010 AT 8:11 AM
Tiny
FALAYME
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  • 9 POSTS
I do not have a security system so I dont think its that. What should I check in the idle system? And how many rpms should my car be reading at idle because its believed to be low but dont know what its supposed to idle at. And no the check engine light never comes on. When it dies I only get a oil light and a battery light and I got an oil change just a week ago
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Saturday, July 3rd, 2010 AT 8:49 AM
Tiny
INTERNETMECHANIC
  • MECHANIC
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I'd have to communicate with the pcm. If the mil/ses isn't operating, how do you know if there is a code or not? If nothing else, use an obd2 code reader, if you can't communicate, I'd want to know why?
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Saturday, July 3rd, 2010 AT 10:09 AM
Tiny
FALAYME
  • MEMBER
  • 9 POSTS
I tried all the things u have said and gone front to back in a car manual book it just keeps sayin to check all the things I have already checked im really at a loss here any other things I should check and try or could u suggest a place that can find it easier cause me and my mechanic got nothing
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Saturday, July 3rd, 2010 AT 2:05 PM
Tiny
INTERNETMECHANIC
  • MECHANIC
  • 700 POSTS
Your mechanic can't communicate with the computer? How come?
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Saturday, July 3rd, 2010 AT 2:08 PM
Tiny
FALAYME
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  • 9 POSTS
His scanners are not reading any codes to communicate thats why its getting frustrating
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Saturday, July 3rd, 2010 AT 2:23 PM
Tiny
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If the scanner will show live engine data, it doesn't matter about the codes. I can't tell if your computer is alive? Because you said the ses lite doesn't work. Key on, no crank, do you have ref voltage at any sensor that uses ref voltage?
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Saturday, July 3rd, 2010 AT 2:47 PM
Tiny
FALAYME
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Ok so what should the voltage read at and what sensors should I check
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Saturday, July 3rd, 2010 AT 3:54 PM
Tiny
FALAYME
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  • 9 POSTS
To correct what I previously said the ses/mil light does come on when u turn the key, it just isnt coming on to show a defect and still reads no codes
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Saturday, July 3rd, 2010 AT 3:58 PM
Tiny
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You got me confused, I don't know which way to turn. Good luck.
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Saturday, July 3rd, 2010 AT 4:21 PM
Tiny
FALAYME
  • MEMBER
  • 9 POSTS
Thanks for your help anyways, ill try someone else
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Saturday, July 3rd, 2010 AT 4:47 PM
Tiny
INTERNETMECHANIC
  • MECHANIC
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As far as no code diagnostics, the list of possibilities is as long as your arm. Listed below.


https://www.2carpros.com/forum/automotive_pictures/512072_no_code_diagnostics_1_1.jpg



https://www.2carpros.com/forum/automotive_pictures/512072_no_code_diagnostics_2_1.jpg



https://www.2carpros.com/forum/automotive_pictures/512072_no_code_diagnostics_3_1.jpg

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Sunday, July 4th, 2010 AT 1:28 PM
Tiny
FALAYME
  • MEMBER
  • 9 POSTS
Thanks alot for the list I will check each one of these things one at a time until I get it.
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Sunday, July 4th, 2010 AT 7:05 PM
Tiny
MCHL1KIM
  • MEMBER
  • 1 POST
What if it was a passtime or passcode on the car?
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Friday, August 27th, 2010 AT 3:01 PM

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