1994 GMC Jimmy Idles high all the time

1994 GMC JIMMY
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ANTHONY BOWLING
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  • 28 POSTS
Engine Performance problem
1994 GMC Jimmy 6 cyl Two Wheel Drive Automatic

This vehicle has a 4.3 Vortec . Everything seems to be OK except it never Idles down. It doesn't miss or backfire or stutters it's like it never warms up. Could this be an Idle Air control , or the TPS ? Is there a way of checking these, and the check engine light flashes on and off sometimes.
Oct 8, 2010 at 7:25 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Try cleaning out the idle air control valve and pull the code/s from the computer
Oct 8, 2010 at 7:38 AM
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ANTHONY BOWLING
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  • 28 POSTS
Thanks, I'll try anything you suggest.
Oct 8, 2010 at 7:44 AM
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ANTHONY BOWLING
  • MEMBER
  • 28 POSTS
Hey one more thing; can't I use a jumper to check for codes? And unhook the battery to clear them?
Oct 8, 2010 at 7:46 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Yes you can use a jumper on the A to B on the diagnostic link connector to pull the code/s and disconnect to clear it
Oct 8, 2010 at 7:48 AM
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