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Old 06-08-2011, 02:25 PM
1988ranger 1988ranger is offline
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Default need more idle help

i have changed pcv valve , filter on pass side valve cover..
cleaned throttle body and replaced gasket , new plugs, wires, cap, rotor ...
all vacuum hoses checked for leaks ... still have idle 1300
runs strong just to fast idle could it be the timing?
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Old 06-08-2011, 03:20 PM
Psychopete Psychopete is offline
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Default Re: need more idle help

There's a lot of missing info that's in your first post, will get better responses with just one thread that has all of the details.

Does your truck pretty much die when you unhook the iac valve? Could be stuck, if it stays the same it is bad. Did the truck have misfires before? Timing is easy enough to check, can't hurt, just pull the SPOUT so the computer isn't advancing the timing. Pulling code might give you some insight, too. Get some vacuum readings if you have a gauge. Still think it's awfully strange that this started happening after a plug change, bet it's something simple,

Last edited by Psychopete; 06-08-2011 at 03:22 PM.
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Old 06-08-2011, 04:11 PM
1988ranger 1988ranger is offline
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Default Re: need more idle help

i think it started after i unbolted throttle body and sprayed with carb and choke cleaner to get the oil out of throttle body and intake was gunked up pretty good ... replaced throttle body gasket ... new vacuum hoses for pcv and filter to valve covers ....the truck does die when i unplug the vacuum to the iac valve.. what spout are you taking about before timing i know on gm's you disconnection vac line going to carb but dont know where it is on ford is the distribubtor vacum advance the way i read it ford is electronic ...
thanks scott

Last edited by 1988ranger; 06-08-2011 at 04:16 PM.
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Old 06-09-2011, 05:11 AM
Psychopete Psychopete is offline
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Default Re: need more idle help

Quote:
Originally Posted by 1988ranger View Post
i think it started after i unbolted throttle body and sprayed with carb and choke cleaner to get the oil out of throttle body and intake was gunked up pretty good ... replaced throttle body gasket ... new vacuum hoses for pcv and filter to valve covers ....the truck does die when i unplug the vacuum to the iac valve.. what spout are you taking about before timing i know on gm's you disconnection vac line going to carb but dont know where it is on ford is the distribubtor vacum advance the way i read it ford is electronic ...
thanks scott
iac valve, did you unplug a vacuum line or a electrical connector? IAC is the cylinder shaped solenoid on the top passenger side of the upper intake plenum. It just has an electrical connector, computer turns it on and off to bypass air to control the idle speed. Not sure if that was just a mix up.

Yes, computer controls the timing advance. The SPOUT is a little jumper you pull near the distributor. Pulling it out would be the same as pulling the vacuum line off a carb to a vac advance dist.

This thing -
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