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OK, took off the throttle body to replace the fuel charge harness today. "While I was in there", cleaned the throttle body with copious spray solvent. Coating of black gunk disappears from throttle body and butterfly valve. Put it back together and it won't start.
Three tries, then I push the gas pedal while cranking and it catches, runs, as long as I have the gas downn, dies when I let it up.
Searched on IAC, sounds like the proper symptoms. However I ran the code scan and got a 'system passed' - no active codes.
SO the question: Could the gunk from the TB be washed down and gum up the IAC? (not sure where the IAC is located relative to the TB).
Also the Ford manual says DANGER DON"T CLEAN YOUR IAC WITH SOLVENTS! Could the TB spraying have washed down into the IAC and killed it? (BTW is that warning hogwash?)
Or is the IAC completely isolated from the TB.
Also, the FAQ for TB cleaning says you may have to start with the throttle pusehd down until it settles down, if I've run it like that for 4 or 5 seconds and it still died, should I assume there's a larger problem?
Thanks!
'95 Contour GL, Zetec/ATX
Repairs: * wheel bearings * sway bar stop * CV joint * alternator * shift interlock * heater tube * VSS * tensioner * ingition coil * wire harnesses * ball joint *
Why do I still love it?
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Originally posted by pangloss:
OK, took off the throttle body to replace the fuel charge harness today. "While I was in there", cleaned the throttle body with copious spray solvent. Coating of black gunk disappears from throttle body and butterfly valve. ...
SO the question: Could the gunk from the TB be washed down and gum up the IAC? (not sure where the IAC is located relative to the TB).
Also the Ford manual says DANGER DON"T CLEAN YOUR IAC WITH SOLVENTS! Could the TB spraying have washed down into the IAC and killed it? (BTW is that warning hogwash?)
Or is the IAC completely isolated from the TB.
Also, the FAQ for TB cleaning says you may have to start with the throttle pusehd down until it settles down, if I've run it like that for 4 or 5 seconds and it still died, should I assume there's a larger problem?
Thanks!
http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=v6maint&Number=931756&page=0&view=collapsed&sb=5&o=186&fpart=1
If you look at the UIM/LIM cleaning in the thread above, you will see that IAC is way off from the TB. You can clean the IAC valve. Disregard the Ford warning.
Some gunk might have gone into the UIM. Might be good to remove and clean the UIM.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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Check the rubber "elbow" hose that runs from the intake back towards the IAC.. if removed, it will cause the car to start, but not hold ANY idle.
Also, you could have had too much solvent/liquid run in to the engine, and you could have created vaporlock.
then, again, the chance that the IAC isn't hooked up(wiring) or is bad is remote but possible.
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Originally posted by Ray:
..... isn't hooked up(wiring) ..
Ray
Ray reminded me. Also check the connector next to the TB.
http://img256.echo.cx/my.php?image=throttlebodycutaway6qo.jpg
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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Originally posted by Tony2005:
Originally posted by Ray:
..... isn't hooked up(wiring) ..
Ray
Ray reminded me. Also check the connector next to the TB.
http://img256.echo.cx/my.php?image=throttlebodycutaway6qo.jpg
TPS? Shouldn't cause a no-run condition. I've removed mine (had TH and it wasn't the IAC.. was troubleshooting a potential faulty TPS reading) and it ran fine for 5 minutes or more.
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Originally posted by Ray:
TPS? Shouldn't cause a no-run condition. I've removed mine (had TH and it wasn't the IAC.. was troubleshooting a potential faulty TPS reading) and it ran fine for 5 minutes or more.
Ray
Humor me. Just unplug it and then plug it back in  .
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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Alright, you guys clearly need something to do on a Saturday night but thanks for your responses.
Ran it again for ~30 seconds holding gas pedal, was able once to ease it down to an idle (rough) but next time I tried just letting off the gas and it died.
Removed plenum again - when I open the butterfly it smells strongly of solvent down there. So I wedged it open to leave for the night so the stuff has a chance to evaporate.
TOmorrow if still problems will remove and clean IAC - is there any way to test the operation of it? BTW it looks to be a royal pain to get at in the Zetec, first time I am jealous of the V6 for a maintenance job, yours looks rigth on top from the pix. Ours is under the intake manifold. I had to unbolt a fuel line bracket just to make room for 2 fingers to remove & replace the connector. Not sure if I should go at it from the top or bottom, anybody tried this?
Checked the vac lines and connectors, Tony.
Thanks guys, I'll update tomorrow.
'95 Contour GL, Zetec/ATX
Repairs: * wheel bearings * sway bar stop * CV joint * alternator * shift interlock * heater tube * VSS * tensioner * ingition coil * wire harnesses * ball joint *
Why do I still love it?
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Well it seems everything is working fine now but I'm still not sure what the problem was. Here's what I did:
-- Left the throttle valve wedged open ~24 hours.
-- Removed throttle body and checked gasket installation, reinstalled. Was worried I put gasket on backwards and blocked the air bypass channel for the IAC. Har. I didn't.
-- Pushed some more on the IAC connector (with no apparent movement).
-- Turned engine on with the entire air box/intake duct/plenum removed (so no MAF or IAT sensor). Started fine, idled fine (considering no MAF), CELs of cours.e
-- Put everything back on, started fine and idled fine. No CELS. Test drive ~10 minutes, no problems.
So maybe it was just not happy about ingesting so much cleaning spray. Next time I clean the TB I'll just take it off, it's only 4 screws, and then you can avoid sprayign the solvent and the gunk you've washed off into the manifold.
Planning to also adjust the throttle cable, maybe it got out of whack when I took off the TB first time and got back into whack when I took it off the second time. I never disconnected the cable, jjust removed the TB from manifold with the cable bracket still mounted.
Should I check the plugs since it was running crappy for a while presuming it was choking on solvent?
'95 Contour GL, Zetec/ATX
Repairs: * wheel bearings * sway bar stop * CV joint * alternator * shift interlock * heater tube * VSS * tensioner * ingition coil * wire harnesses * ball joint *
Why do I still love it?
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I'd have to double check, but I'm pretty sure the throttle body is coated and is not supposed to be cleaned with chemicals. I don't believe this is your no start, but it will affect driveability. The air does not come in smooth anymore, and the fuel/air doesn't mix as it should. I also seem to remember the same for the IAC. I just logged in to Alldata and it verifies what I thought. You may have damaged the IAC, and likely disturbed the coated surface of the throttle body. Unless you have access to a bi-directional scanner and can check the operation of the IAC, I'd replace the IAC.
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Branchingout:
While I won't argue what the warnings SAY...
I will say that realworld data and use have proven, at least in my (and many others) experience that the TB can indeed be cleaned, as well as the IAC.
Your thoughts are much appreciated, though.
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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