idling problem

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Sep 11, 2009 | 02:49 PM

ndanl

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From: Timisoara, Romania

idling problem

hi,

my '91 engine dies in idle, I have ~45 psi on the fuel ramp, put new injectors, new spark wires, new fuel pump+filters and check the injectors with light, all seems to be ok, any hints ? may be a problem with the idle senesor or any sensors ?

thanks,
Dan

Sep 11, 2009 | 02:56 PM

0Paul Ruggeri

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From: Carmichael ca

Does it run OK otherwise? Probbably an idle air valve. But check for vacuum leaks and do a search of setting basic idle speed.

Sep 11, 2009 | 02:58 PM

ndanl

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From: Timisoara, Romania

sometimes it runs perfectly in idle, and yes otherwise runs great, as much as I can say

Sep 11, 2009 | 04:47 PM

94z07fx3

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Vacuum leak or EGR stuck open?

Sep 11, 2009 | 04:56 PM

WW7

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From: WV

Quote:

Originally Posted by Paul Ruggeri

Does it run OK otherwise? Probbably an idle air valve. But check for vacuum leaks and do a search of setting basic idle speed.

Sounds like the IAC is gummed up. Take it out and clean it and the channels that feed it. Carb cleaner works, and you will also need new gaskets. Check for vacuam leaks first...WW

Sep 12, 2009 | 07:51 AM

ndanl

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From: Timisoara, Romania

new gaskets for what ? what do I need to dismount to get the IAC out ?

Sep 12, 2009 | 09:41 AM

ndanl

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From: Timisoara, Romania

Quote:

Originally Posted by 94z07fx3

Vacuum leak or EGR stuck open?

I dont think EGR have something to do with idling, or ?

Sep 12, 2009 | 11:03 AM

94z07fx3

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Quote:

Originally Posted by ndanl

I dont think EGR have something to do with idling, or ?

As others mentioned, the IAC should be your first check. I was tossing vacuum and EGR valve into the mix because they too can cause an engine, even a strong V8, to die at idle. If an EGR valve is sticking in the open position due to carbon build up, for example, then it will act like a big vacuum leak and the engine will die.