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1999 GMC Jimmy car's engine is ok until it warms up

Tiny
DOGJAW
  • MEMBER
  • 1999 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 135,000 MILES
Car's engine is ok until it warms up. Then it stalls when I press on the accelerator, sometimes it comes to a complete stop. Then engine does not die. On occations I hear a click sound when I press the accelerator and sometimes I hear a hiss sound.
Monday, November 24th, 2008 AT 10:29 AM

5 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
First, do you have a "check engine light"? It may be several things such as vacuum leak, throttle position sensor or the mass air. How long has this been going on? Please advise, it will help us narrow it down.
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Monday, November 24th, 2008 AT 11:26 AM
Tiny
DOGJAW
  • MEMBER
  • 3 POSTS
The light has been on for over a year. The accelerator problem has started a week ago as a slight stutter when I pressed on the accelerator. It would pause then I would get power.
I have had a problem that I failed to mention before. For about a month now I would start my car when it's cold and it would start ok. When it warmed up I would have to try to start it about 3 times before it would kick in and start. I blamed it on the ethenol gas I used a couple of times. Maybe this is related?
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Monday, November 24th, 2008 AT 2:40 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
Your check engine light may have been on for a year, but whatever tripped the light may have worsened to the point of affecting performance. There are 2 or 3 sensors that could cause the symtoms you describe. With the information I have to go on, all I can do is guess at the solution, and guessing can get expensive. Please advise.
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Tuesday, November 25th, 2008 AT 6:04 PM
Tiny
DOGJAW
  • MEMBER
  • 3 POSTS
I had a computer check ran at the local auto parts store. Showed a faulty forward oxygen sensor, so I'm replacing it this AM, as well as fuel filter, oil change etc. Should this do the trick?
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Saturday, November 29th, 2008 AT 8:42 AM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
You're on the right track. If that doesn't do it, give us a holler back.
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Monday, December 1st, 2008 AT 6:05 PM

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