TB and IAC (idle air control) valve cleaning - Page 3
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Cadillac Tech Tips - How to fix it Discussion, TB and IAC (idle air control) valve cleaning in Item Specific Cadillac Discussion; Ern, Most of us think you have CKP problems - but if you want to clean the IAC, in your ...
  1. #31
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: TB and IAC (idle air control) valve cleaning

    Ern, Most of us think you have CKP problems - but if you want to clean the IAC, in your car it's held by 2 Philips or Torx machine screws into the left (front) side of the TB. The screws are easy to drop - careful. Remove the IAC and clean the top hat plunger with a bit of TB spray but be careful not to let much/any run into the solenoid body itself. Also clean out the bore and passage in the TB with a fuzzy pipe cleaner - packs of them from craft stores. Rub a drop of engine oil on the O-ring and replace the IAC.

  2. #32
    BigErn23's Avatar
    BigErn23 is offline Cadillac Owners Member
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    Re: TB and IAC (idle air control) valve cleaning

    Thanks for the illustration.
    ....not sure about the butt plug, though.

    I figured I'll give it a shot. I understand its likely going to come down to the CKP, but I wont have time for that for a week or two.
    But thanks for all your time/help. I'll check the IAC tomorrow just to see if it makes any difference.
    If it is CKP for certain, think that would cause poor idle at standstill?

    Anyway.....if none of this works I'll just get a couple of them chrome fender louvers and be done with it.

  3. #33
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: TB and IAC (idle air control) valve cleaning

    My bad CKP sensor never caused an idle problem and I can't recall ever hearing of that. When they go bad they cause a longer than normal crank time and/or a stall at idle or sometimes a stumble or stall at cruise.

  4. #34
    DEVILMANMN is offline Cadillac Owners Member
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    On my 2000 deville base model the vacuum port in this picture has a plug on it. I see in his picture it goes to something?
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  5. #35
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    Re: TB and IAC (idle air control) valve cleaning

    Of course it does - remove the beauty cover and trace the plastic line - or are you talking about the MAP sensor on top ?

  6. #36
    01SevilleSTSSpeeder's Avatar
    01SevilleSTSSpeeder is offline Cadillac Owners Member
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    Hi there, I read first page and cleaned my throttle body and iac best of my ability, only had carb cleaner and tooth brus and shop towels, went to start car after all was cleanecleaned and now it high idles at like 1500 or even 2000 rpms, what happened, I'm not putting it in gear like that, that would deviate my transmission, it has 224000. The only reason I wanted to clean iac was cause it had rough low idle and misfire that occurs only at idle, hit gas and runs on all eight whole time not idling, but that's besides point now. How do I fix this, New/used iac, they have them on ebay for 15 bucks aftermarket? Thoughts and ideas. Need my car and can't drive it like that,
    p.s., silly me being cureous sometimes, I pushed and pulled on valve while cleaning it to see if it would move more freely, not knowing what I was getting into, put it in clamped everything back up, over rev, shut down, remove, figure if it sticks out and revs up, we'll I'll just push it in and idle down, put it back in and start, revs higher and more erratic, PLEASE HELP, loved my car till iidle issues started.

  7. #37
    Ranger's Avatar
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    Re: TB and IAC (idle air control) valve cleaning

    Quote Originally Posted by 01SevilleSTSSpeeder View Post
    p.s., silly me being cureous sometimes, I pushed and pulled on valve while cleaning it to see if it would move more freely
    That may be your problem. You could try pulling both battery cables and touch them together. If that doesn't help, you might try the idle learn procedure. If all else fails, you may have to replace the IAC valve.

    Have you pulled the DTC's?

  8. #38
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    Re: TB and IAC (idle air control) valve cleaning

    Quote Originally Posted by Ranger View Post
    That may be your problem. You could try pulling both battery cables and touch them together. If that doesn't help, you might try the idle learn procedure. If all else fails, you may have to replace the IAC valve.

    Have you pulled the DTC's?
    All I have is rough idle, with random misfire code, got it scanned, p0303, but car only shows p0300 and I know car wont show specific cylinder, but have replaced iac valve just cause was 15 bucks on ebay. Now it idles bit better, but also cleaned egr valve, inside of throttle body and removed and reinstalled tps, now it idles better but while warming up after 1100rpm high idle it surges till fully warm and idles around 650-700 but sill rough. Put it in gear and of course idle drops to about 550-600 and check engine light starts flashing, idle gets rougher, hit gas and stops misfiring and runs on all eight, can floor it and it goes like it should. So dunfounded, don't know what to do next. how do I relearn idle procedure, and what does touching cables together do? Also with removing and reinstalling tps it didn't go back on exactly how it was, slightly turned a tad. now throttle is touchier and when its warming up and go to hit gas, it wants to take off a bit on its own like it revs up, but once warm it acts normal. Thinking I might need to replace tps, but hat wont fix idle issue. And wouldn't i have to have tps relearn or something.But car hast been right since idle issue started. At least I can drive it now. Any more advice, lol?

  9. #39
    Submariner409's Avatar
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    Re: TB and IAC (idle air control) valve cleaning

    For that car the

    TPS relearn is - turn the key ON (no start) for one minute, turn it OFF for at least 30 seconds.

    IAC relearn is - START and idle for 15 seconds, engine OFF for at least 15 seconds. Restart and check idle speed at about 650, in P, N, or D and with A/C ON or OFF - all 650 rpm.

    (2002 Seville service manual set, powertrain management, fuel/air and sensor(s))

  10. #40
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    Re: TB and IAC (idle air control) valve cleaning

    Quote Originally Posted by 01SevilleSTSSpeeder View Post
    what does touching cables together do?
    Think of it sort of like a computer reboot.

  11. #41
    teeluv31 is offline Cadillac Owners Member
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    Didnt drive my car for about 2 days because of low idling issues. So cleaned the TB and the IAC port. (Have cleaned the TB before but not the IAC or port) When I took the IAC out the plugger was wide open. I could see the spring and all. So is my IAC bad?

  12. #42
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: Cleaning the TB & IAC valve on a 2000+ Northstar

    Here's what your 2002 IAC should look like. The black "top hat" pintle is attached to a motor that moves it in and out to control airflow around the throttle blade.

    RockAuto - and not cheap. Maybe there are a few decent junkyards in your area - any 2000 - 2003 Northstar engine.
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