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1991 s-10 4x4 4.3 pickup

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cunfused marvin
New User

Apr 8, 2011, 4:00 AM

Post #1 of 4 (1932 views)
  post locked   1991 s-10 4x4 4.3 pickup  
what will casue it to start but not idle


zmame
Veteran / Moderator
zmame profile image

Apr 8, 2011, 4:44 AM

Post #2 of 4 (1927 views)
  post locked   Re: 1991 s-10 4x4 4.3 pickup  
many things it could be.

vacuum leaks
IAC (idle air control valve)
Air restriction (gummed up thorrotle body, plugged filter)
EGR stuck partially open
... could be more things

Is check engine light on, if so what codes are you getting?.


Doggers
New User

Jan 7, 2012, 3:05 PM

Post #3 of 4 (1471 views)
  post locked   Re: 1991 s-10 4x4 4.3 pickup  
I had the same problem, with no codes. I pulled the fuel line off and it worked fine, but I did not check fuel pressure.
When I unplugged the temp sensor on the front of the engine, it ran at a crazy high idle.
Well, it turns out it was a 2 inch hose, inside the fuel tank was split. It went from the fuel pump to the housing. When the pump began to build up pressure, the line opened up and shot fuel BACK into the tank.
That caused the throttle body to starve for fuel, thus running like crap, then running great, then running like crap again.
It was a 1 dollar fix, but i had to drop the tank to access the pump.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 7, 2012, 3:36 PM

Post #4 of 4 (1469 views)
  post locked   Re: 1991 s-10 4x4 4.3 pickup  
Again........ old thread Doggers



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