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Car idles really rough at start up until warmed up

Tiny
GRANDAMKC
  • MEMBER
  • 1999 PONTIAC GRAND AM
  • 113,000 MILES
My 99 grand am runs really rough until it warms up and then is fine. Lately when I start it, it sputters and dies. If I punch the gas quickly it comes to life. There is a fuel smell with the exhaust. I have unplugged the maf sensor and there is no change and it is clean. Egr valve seems to be ok and the passages are not blocked. I have sprayed all over with carb cleaner and haven't found any vacuum leaks. I'm at a loss! It's the 3400 engine.
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Saturday, November 9th, 2013 AT 5:43 AM

6 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Pull the vacuum line off the fuel pressure regulator with the engine running and see if any fuel comes out of the regulator port.
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Saturday, November 9th, 2013 AT 6:06 AM
Tiny
GRANDAMKC
  • MEMBER
  • 4 POSTS
Pulled the vacuum line from regulator and ran for five minutes. No fuel coming out
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Saturday, November 9th, 2013 AT 7:08 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
OK, that means it's good. You are going to need a high end scan tool to analyze the sensor data when this is happening to paint a picture of what is happening inside the engine before you can determine why it's happening.
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Saturday, November 9th, 2013 AT 7:23 AM
Tiny
GRANDAMKC
  • MEMBER
  • 4 POSTS
Ok this time it threw another code. A po0133 for 02 sensor bank 1. Any ideas?
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Saturday, November 9th, 2013 AT 7:26 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
That slow response in that sensor and it should be replaced but I expect you have more problems than that.
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Saturday, November 9th, 2013 AT 7:29 AM
Tiny
GRANDAMKC
  • MEMBER
  • 4 POSTS
Got it fixed! Put a match in the gas tank and now no more problem! Lol
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Saturday, November 9th, 2013 AT 7:49 AM

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