koolone
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Joined:
May 2005
Pitts,Pa USA
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Well I swapped the IAC from my 90 Bronco...Same symtoms... I ran KOEO,and KOER test again hoping something would show-up..No codes... I'm lost...Watch for a very clean bird for sale (comes wth a rough idle problem)soon..Thanks Jeff for ur help and the parts link...
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turbocoupes
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Joined:
Jul 2003
Aberdeen,Maryland
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When engine is cold unplug the vacuum line going to the EGR valve and leave in disconnected...just try it for "giggles" and see if it makes a differences...
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Garry McVey "BIRDS OF A FEATHER" Birdoprey always in flight... TBird TC owners are usually wingin' it
TC's 83 project, 86 donor for 83, 86 FUN street car,87 RIP, 87 blue to be stock street car, 87 red donor for blue and others, 87 red daily driver, 88 street and strip HALF WICKED right now, 87 XR4ti project,80 pinto wgn project
Garry McVey "BIRDS OF A FEATHER" TBird TC owners are usually wingin' it
TC's 83 project, 86 donor for 83, 86 FUN street car daily driver with speed equipment from Red 88 donor, 87 blue to be stock street car, 87 red donor for blue and others, 87 red donor, 88 street and strip(now a donor) 14.01 chasin 13.0's, 87 XR4ti project,
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koolone
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Joined:
May 2005
Pitts,Pa USA
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Quote:Originally posted by turbocoupes:
When engine is cold unplug the vacuum line going to the EGR valve and leave in disconnected...just try it for "giggles" and see if it makes a differences...
Ok if we're looking for a "giggle' we have one. I tried it...Same problem...Now my car has had the catalyst modified as per a recall. They added a vacuum delay valve in-line wth the EGR vacuum line. It happens whenever (so it seems) the t-stat opens..It's like clock wrk. Something must be changing at that time???
Thank you
[This message has been edited by koolone (edited 05-16-2005).]
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turbocoupes
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Joined:
Jul 2003
Aberdeen,Maryland
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Maybe base throttle blade setting ? Unplugging the IAC...idle drops & smooths out...maybe a vacuum leak somewhere? With idle drop and smoothing sounds to me that you basicly made it go rich...(less air) I would look for a vacuum leak...pinching or plugging lines...
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Garry McVey "BIRDS OF A FEATHER" Birdoprey always in flight... TBird TC owners are usually wingin' it
TC's 83 project, 86 donor for 83, 86 FUN street car,87 RIP, 87 blue to be stock street car, 87 red donor for blue and others, 87 red daily driver, 88 street and strip HALF WICKED right now, 87 XR4ti project,80 pinto wgn project
Garry McVey "BIRDS OF A FEATHER" TBird TC owners are usually wingin' it
TC's 83 project, 86 donor for 83, 86 FUN street car daily driver with speed equipment from Red 88 donor, 87 blue to be stock street car, 87 red donor for blue and others, 87 red donor, 88 street and strip(now a donor) 14.01 chasin 13.0's, 87 XR4ti project,
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koolone
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Joined:
May 2005
Pitts,Pa USA
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You know I keep thinking it might be a vacuum leak!!! I've alway's had good luck sraying starting fluid all around the hoses, ect, ect, with the motor running. I about used 2 cans and I can't locate a leak... I'm still trying to figure out what changes at about the time the t-stat opens??? I have a OTC scanner and unlike GM, Ford does not trigger the lights on it when there is a transition frm open to closed loop. Thank you very much for ur reply.
[This message has been edited by koolone (edited 05-16-2005).]
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koolone
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Joined:
May 2005
Pitts,Pa USA
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Quote:Originally posted by koolone:
You know I keep thinking it might be a vacuum leak!!! I've alway's had good luck sraying starting fluid all around the hoses, ect, ect, with the motor running. I about used 2 cans and I can't locate a leak... I'm still trying to figure out what changes at about the time the t-stat opens??? I have a OTC scanner and unlike GM, Ford does not trigger the lights on it when there is a transition frm open to closed loop. Thank you very much for ur reply.
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powered by turbo
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Joined:
Apr 2003
Boise, ID
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Sounds pretty much like the normal idle problems to me. Have you set your base idle? What voltage did you set your TPS to?
[This message has been edited by powered by turbo (edited 05-17-2005).]
1986 Mustang SVO
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Keith Nubel
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Joined:
Apr 2001
Liberty Township, OH
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One problem that's over looked is the intake manifold gasket(s). The lower one to the head fails and causes a vacuum leak. It's a major pain to get the lower bolts out but might be worth the effort. I have had similar idle problems for a long time and have never found the solution. When I clear the EEC and disconnect the battery for 10-15 minutes the idle is perfect for a while and then acts up again. I think there is a problem with our EEC's that cause this issue.
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85.5 TC 5 speed, Ranger Roller cam, 3" exhaust system, manual boost valve, large VAM, SVO PE computer, front mount Motorsport intercooler & sport grille, ported upper and lower intakes,flow matched injectors, ported E6 manifold, 245/45/17 wheels & Tires,Motorsport 140 mph speedometer,Motorsport lowering springs, Kenwood EZ500 200 watt receiver with Cerwin Vega speakers sound system, air conditioning converted to R134A and Sanden compressor retrofit kit installed, under restoration
1985 TC
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Pete D
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Joined:
Apr 2001
Northern OH
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One book I'm reading mentions that poor grounds can cause/contribute to all kinds of problems including idle problems
Pete Dunham
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koolone
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Joined:
May 2005
Pitts,Pa USA
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Ok I know this is getting old for you .....However, I really appreciate all ur input..! Base idle= 760, TPS did not like anything under .98. Mine is set at 1.00 I've always had the normal idle problems. But this is ab-normal...Keith I followed ur instrutions to a t..and set base idle and Tps.Same problem???? Pete if it was a ground problem.....I think it would show up a all times??????? Still searching for wht changes when it goes frm cold to hot??? Thank you all for taking ur valuable time to try and help me...
Jim
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