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1990 Pontiac Grand Prix engine stalls

Tiny
HAYLUCKMANME
  • MEMBER
  • 1990 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 117,636 MILES
Replaced radiator waterpump thermostat temp sensor throttle position sensor maf sensor idle air sensor plugs & wires fuel filter air filter changed oil & oil filter replaced all vacuum hoses fuel pressure checked & good. Check engine light was on b4 all this now it isnt & no trouble codes now. Car drives perfect for about 20 minutes then starts running rough & dies stalls will restart but idles rough & dies unless it sits for few hours then runs good for 20 & same thing. Very frustrated
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Monday, August 30th, 2010 AT 12:54 PM

8 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Is your car losing coolant?
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Monday, August 30th, 2010 AT 12:58 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Is your car losing coolant?
Any white smoke?
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Monday, August 30th, 2010 AT 12:58 PM
Tiny
HAYLUCKMANME
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  • 5 POSTS
First of all the car had radiator leak so replaced it along with waterpump & thermostat. Car sat all winter & when we went to drive again the fuel was rusty color & fuel filter kept getting clogged so dropped tank to empty completely & replaced filter. A mechanic friend thinks it may be EGR valve?
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Monday, August 30th, 2010 AT 2:09 PM
Tiny
HAYLUCKMANME
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Im being told now that a lil white smoke when started
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Monday, August 30th, 2010 AT 2:11 PM
Tiny
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  • MECHANIC
  • 20,761 POSTS
These engines are notorious for intake manifold gasket leaks and will suck coolant into the combustion chamber and both consume coolant and cause misfires.
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Monday, August 30th, 2010 AT 2:28 PM
Tiny
HAYLUCKMANME
  • MEMBER
  • 5 POSTS
Yeah I know about intake gaskets on my 96 grandam but it did overheat & antifreeze was mixing n2 oil but this car hasnt ever ran hot the oil looks good & no coolant loss. How would we know if its the intake gaskets 4sure? Other than white smoke which is only when 1st started & coolant loss which we r not noticing any?
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Tuesday, August 31st, 2010 AT 7:57 PM
Tiny
HAYLUCKMANME
  • MEMBER
  • 5 POSTS
Intake manifold gaskets? The car runs perfect until it reaches normal temperature then it dies or idles real rough when u go to give it gas tryn to rev it up it does opposite & kills it.
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Wednesday, September 1st, 2010 AT 1:47 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Your going to have to use a scan tool to diagnose it. You need to look at all the sensor data when the problem occurs so you can see what's out of spec at the time.
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Wednesday, September 1st, 2010 AT 1:57 PM

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