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Idle 1000 - 2000. No vacuum Leak. WTF

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    #1

    Idle 1000 - 2000. No vacuum Leak. WTF

    the idle revs up and down up and down from 1G to 2G. NEVER STOPS. i can't find any vacuum leak at all. Any ideas?
    Tags: None
    #2
    idle air control valve is stuck
    miss my turbo cb7
    moved onto volvos. dont know how that happened, just did

    Comment

      #3
      i replaced the IAC and tryed blocking it with a card. Still revs crazy. Anything else u think?

      Comment

        #4
        fast idle thermal valve...(FITV)

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          #5
          Did you just do any work on the intake manifold? An H23 swap per chance?

          Try blocking the air intake entirely while the car is running. Does it still run? If it does, obviously you have a fairly significant leak between the air filter and intake manifold gasket. I had this problem and it turned out to be the starting air valve, which I forgot to connect back up; if no vacuum is applied, it essentially creates a giant leak.

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            #6
            Change the sensor behind the throtttle body idk the namwe i think its the pcv valve or something like that but my car is doing it now and i got alot of friends that work in advance auto parts thats wat they told me to fix...

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              #7
              How did you determine you don't have a vacuum leak, btw? The more information you provide, the better the responses you'll get.

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                #8
                adjust the fitv like cb7 ex coupe said


                h22a4+p2u5 trans+8000rpm= 135mph in 4 gear

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                  #9
                  well i checked every vacuum line on the manifold and all are connected or plugged. i sprayed starter fluid around manifold and didn't get any rpm change. I changed the IAC today and tryed blocking it off. nothing. even tried reseting ECU. Having same problem. i have a f22a1. auto to manual swap. i just put a new block in. new head gasket, timing belt, rear main seal, oil pan gasket, valve cover gasket. Will mess with FITV tomorrow i guess.

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                    #10
                    Check your MAP sensor as well, it is common that idles up and down when MAp sensor is messed up or somthing is wrong.

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                      #11
                      Fixed it!! the FITV was the problem. I took it off and replaced it with another one. idles fine. thanks guys. BIG help

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