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high idle after IAC cleaning 700 1992

posted by  someone claiming to be Robb Mc on  Sat Oct 8 11:57 CST 2011 [RELATED]

Hi All,
Stumped on this one. Insanely high idle (like 3000rpms)= double checked all the hoses and clamps. Swapped out the IAC for a known good one off the shelf - same thing. Disconnnected cruise cable in case it had gone bonkers - same thing. Then I took the IAC out of the loop by disconnecting it at the intake bellows and at the intake manifold and plugging every thing up - same thing. How could air be getting in there? Throttle plate is closed and TPS is clicking properly. I didn't even touch the TB, just the IAC. I noticed the vacuum line had fallen off the back of the Cruise control activator and I plugged that back in and other than that all I touched was the IAC and the hoses. How is this racing happening? Any ideas welcome. This is a turbo btw.








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    high idle after IAC cleaning - problem gone 700 1992

    posted by  someone claiming to be Robb Mc on  Sat Oct 8 14:06 CST 2011 [RELATED]

    I hate to say this but it just stopped doing it. I was removing and plugging all the vacuum lines in the manifold, confinced that one of them was pouring air in somehow. Was making no progress and I just plugged them all back in and it stopped doing it. Put the IAC back in the loop - still normal so I don't know. I hate these kind of resolutions. Buttoned it back up went for a ride - there is definitely a "learn mode" on these ECUs because for a few miles the idle was too high and when I put in park it would lope up and down but after about 30 minutes it returned to normal. Thanks all for the input. Now on to winterizing the boat...








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    high idle after IAC cleaning 700 1992

    posted by  Steve on  Sat Oct 8 12:43 CST 2011
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    last visit: Fri Oct 24 07:16 CST 2014
    [RELATED]

    Check the TPS for proper operation. It is essentially a switch that has continuity at the stops. Instructions in the FAQ.
    --
    See the 700/900 "FAQ" at the menu bar top screen left side.








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    high idle after IAC cleaning 700 1992

    posted by  aleekat on  Sat Oct 8 12:11 CST 2011
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    last visit: Fri Oct 24 13:19 CST 2014
    [RELATED]

    Only two suggestions I can give:
    Check your throttle cable is routed correctly.
    I would pull that vacuum line that you plugged back into the cruise. Maybe it doesn't go there? I do recall a blocked nipple on the cruise that serves no purpose. It looks like it should have a hose connected, but it doesn't.
    --
    Post Back. That's whats makes this forum work.







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