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Rough idle and exhaust smell

Tiny
JCAIN
  • MEMBER
  • 1998 PONTIAC SUNFIRE
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 70,000 MILES
I have a 1998 sunfire Gt with 70,000 miles. When I first start up the car two things happen. 1) my idle wants to "serge" between about 700 & 1200 RPM's. 2) at the same time my exhaust sputters and smells like un burnt gas. When I back out of my driveway, sometimes my idle surges and I either have to kick the gas pedal, or put it in neutral. As I drive this stops. It only happens durring the initial start up. What could be the cause of this, and how can I fix it?
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Saturday, November 13th, 2010 AT 6:15 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try cleaning out the idle air control valve and test the throttle position sensor-
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Saturday, November 13th, 2010 AT 6:21 PM
Tiny
JCAIN
  • MEMBER
  • 3 POSTS
Thanks for the advise, I'll try to find the idle control valve. As far as the TPS this has been replaced twice in the last 2 years. Do these things usually go out like this, or is it maybe some other issue?
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Sunday, November 14th, 2010 AT 3:08 AM

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