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1991 Buick Century with 3.3L V-6 wont start after it gets hot. After it cools off it will start again.

Tiny
SPIRITWOLF522
  • MEMBER
  • 1991 BUICK CENTURY
  • 135,000 MILES
Starts fine when cold but after driving awhile and shut off, it wont start again. Sometimes it starts to run rough after warmed up. Replaced spark plugs, ignition module and coil packs are good.
Wednesday, November 30th, 2011 AT 9:50 PM

10 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Do you have any codes?Have you checked for codes?Also when it dies and wont start what dont you have spark or no fuel pressure?
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Wednesday, November 30th, 2011 AT 10:02 PM
Tiny
SPIRITWOLF522
  • MEMBER
  • 6 POSTS
No codes come up, and not sure about fuel pressure, haven`t checked that yet. I`m reading some posts that a weak fuel pump could cause it after it warms up. I hope thats not it as its a pain to replace. Could a plugged pcv valve do that? Thanks
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Wednesday, November 30th, 2011 AT 10:24 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Have you checked for spark when it doesnt start?Also you can rent a fuel pressure tester at auto zone.
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+1
Wednesday, November 30th, 2011 AT 10:29 PM
Tiny
SPIRITWOLF522
  • MEMBER
  • 6 POSTS
I have a fuel pressure gauge, just haven`t checked it yet. I`ll check it and for spark and let you know what I find.
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Wednesday, November 30th, 2011 AT 10:33 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Let me know about the fuel pressure and spark when it doesnt start?
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Wednesday, November 30th, 2011 AT 10:36 PM
Tiny
SPIRITWOLF522
  • MEMBER
  • 6 POSTS
I will keep you posted. Thanks.
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Wednesday, November 30th, 2011 AT 10:47 PM
Tiny
SPIRITWOLF522
  • MEMBER
  • 6 POSTS
I checked the fuel pressure under no start condition and its within spec and am getting spark also. I`m now thinking partially plugged cat or muffler.
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Monday, December 5th, 2011 AT 2:02 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Also when it wont start check for injector pluse. The strange part is if it was a cat you should lose power and then die not run good then not start after shutting it off. Next time it wont start try holding your gas pedal all the way to floor while cranking it. Could be a bad coolant temp sensor.
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Monday, December 5th, 2011 AT 4:08 AM
Tiny
SPIRITWOLF522
  • MEMBER
  • 6 POSTS
It did seem a bit doggy after it warmed up some. It did die once and started again but died. I also held the throttle wide open to try to start it and it wouldn`t start.
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Monday, December 5th, 2011 AT 4:26 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
To check for a clogged cat you need to have a back pressure test done on the exhaust when its acting up.
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Monday, December 5th, 2011 AT 4:46 AM

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