Question about 1989 Honda Prelude

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Idle irratic the car has irratic idle when the temp. of outside air is cold summer time it is ok . no intake leaks so what can I do?

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  • cowboy5717 Nov 07, 2008

    so is thier a way to check the iac valve? or do you just replace and hope? thanks

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Could be the IAC (Idle Air Control) valve. I had a similar problem on my old integra in the winter and that was the problem. It's on the intake manifold and for the older integras i know is kinda common.

Posted on Nov 06, 2008

  • Steve N
    Steve N Nov 07, 2008

    What I have done before is taken the intake tube off and opened up the throttle plate and sprayed carb cleaner or brake cleaner in there aimed at the IAC valves to try and free them up and sometimes it works, sometimes it doesn't. The unit has little valves in there and over time carbon deposits build up and can cause the valves to stick or clog up a little restricting air and whatnot. It's worth a try for only the price of the can of carb cleaner. Just don't spray way to much in at once. The car may also take a couple crank over's to start, that's normal...that just is when the carb cleaner is working its way through. Hope this helps

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you skipped the #1 fact, hot or cold or both?
EFI runs in MODES. cold is one , hot is another.
if coolant fails to reach proper temp, the thermostat is bad.
or installed wrong.!
I'll toss dice and land on HOT.

idle controls, are out of control. for sure. if really HOT.
This car has EFI,
EFI has many jobs but one is idle control
the ECU does that. (PCM)
if idle surges, it is , then its out of control
here is a list of things( my full list exceeds 26)
1: thermostat (coolant) is bad and wont hold 180 to 200F temps.
2: ISC (idle speed controller, dirty and sticks)
3: IAC (some cars have this and it can stick open0
4: throttle cables set wrong.
5: Air leaks so large to the plenum the ISC loses control.
6: spark or cam timing why off , poor service .
pause.
there are others, but the above covers the top ones.
there are a number of simple tests to do , that solve this riddle.
a: motor good, check compresion.
b; timing of cam good and spark?
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I know for sure you have air leaks.
the lists for finding air leaks in the induction system (intake and plenum) is huge.
Using a smoke machine takes a very skilled mechanic.
one safe way is to use a rubber tube to your ear and listen
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Buy a can of spray throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional

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don

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