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F20 Idle problem after h23 intake swap

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    #1

    F20 Idle problem after h23 intake swap

    Hello everyone I'm new and not from around so my english may be little bad...
    So I decided to tune my F20 engine, and put an h23 intake/exhaust 4-2-1 to the engine,new air intake, down pipes and so on, but after the swap my car does idle poorly on cold, I checked the fast idle valve, it was ok I change it yesterday just in case, and nothing changed. I put an plate on the air boost valve, same old song... and I'm running out of ideas how to make this intake work does someone know how to fix this problem?
    By the way, when cold the fast idle thermo valve does not suck air, when I remove the cover plate then I push with finger air rushes in the valve and the RPM goes high, I try to loosen the cap of the valve to reduse presure from the spring in it but still nothing. I Have an idea that the FITV and the air boost valve work together somehow,and this problem is with both tuned p28 ECU and the factory one so I'm gesing this is mechanical ussue. But as I say I'm running out of ideas how to make this work.
    Best regards
    Tags: None
    #2
    If you're sure the IACV and FITV are working correctly, and that you have no vacuum leaks, my next thought is that there could be air in your cooling system. That can cause idle issues. Bleed the system to get all air out. If that doesn't fix it, we can dig deeper.

    Your English is better than many people here, by the way. Perfectly easy to follow! Welcome to the site! Are you from Bulgaria?






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      #3
      Thank you, yes I'm from Bulgaria.
      The IACV, is from my last intake, and I did not have any problem with idle but when I unplug the IACV cables the rps go down to 500-600 so it has to be working. The FITV I have 3 now, and they work in the same order as the on in my throttle body of the intake. I tested them in this order: Firs in room temperature I try to breathe through the coolant openings to see if the coolant path is blocked, then I do the same with the openings that the air travels and I adjust it so I can breathe easy from the FITV (I adjust it when I screw it down to the end, and then I make one revolution contrariwise) Then I flow hot water in it (50-60 deg C) and check if the valve is closed I do this with my mouth and I cannot blow air through the valve, so from that I assume that the valve is working properly.
      I make some tests today, at first I blocked all not working and not needed vacuum lines and I only let the MAP sensor hooked up, and nothing happens... Then I put a direct vacuum line in the Air Boost Valve, and in the start the RPM go as 1800, then they go back to normal, when I looked on the throttle body the Air Boost Valve somehow bypass the FITV and lets air in the intake from the hole in the bottom of the throttle body, that ordinary the FITV takes air from it. I tare the FITV down again, and when I pressed it the Idle comes to what it should be, and I assume somehow there is not enough back pressure from the intake to the FITV to open the FITV so the air can go through it.

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        #4
        Hello,
        So the problem is solved and it took me some time to fix it. The problem with the FITV and the idling was because of faulty throttle body gasket. I made an custom one for my car from klingerit because from Honda dealer were not able to find throttle body gasket for h22/h23 in Europe or Japan for me (that was weird by the way). So that fixed the low RPMs on cold, but the idle problem was not solved until now, it was because of a brand new Denso spark plugs that leaked compression out of the cylinder from the ceramic body and that was even more strange for me because they were not cheap, so that is how I fixed the Idling problems.
        Best regards from me and thank you for the help.

        Comment

          #5
          Wow. I never even thought of the throttle body gasket. I'm glad you figured it out! The H23 was probably more popular in the US than anywhere else in the world. Shipping may be expensive from the US to Bulgaria, though.
          I'm surprised the Denso plug had a problem. Those are supposed to be among the best you can get! I suppose even the best have problems sometimes.

          Thanks for sharing your solution. Someone with the same problem may find it useful in the future!






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