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Idle

Tiny
JJKENJO
  • MEMBER
  • 2003 GMC SIERRA
  • 132,100 MILES
When im sitting at a redlight the truck idles at 300 rpm when I touch the gas it will die. I have replaced throttle position sensor, mass air flow sensor. Found no vacuum leaks no service engine light. What could cause the truck to do this
Saturday, April 27th, 2013 AT 3:18 PM

4 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Base idle is way to low, have you checked the IAC as yet? That is the idle control motor.
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Saturday, April 27th, 2013 AT 4:51 PM
Tiny
JJKENJO
  • MEMBER
  • 4 POSTS
It's made into the throttle body my truck has a 5.3 v8 t model no egr valve
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Saturday, April 27th, 2013 AT 6:37 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Have you checked it yet?
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Sunday, April 28th, 2013 AT 12:35 AM
Tiny
JJKENJO
  • MEMBER
  • 4 POSTS
Its good checked the fuel pressure it is at 30 psi
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Sunday, April 28th, 2013 AT 9:16 AM

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