Need some help

Discussion in 'Engine' started by ALEX-CY, Nov 7, 2016.

  1. EK9 Matt

    EK9 Matt Well-Known Member

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    Possibly the IACV.
     
  2. ALEX-CY

    ALEX-CY Active Member

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    I already replace it with genuine new one
     
  3. EK9 Matt

    EK9 Matt Well-Known Member

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    Ah, that theory is blown out of the water then. Possible vac leak??
     
  4. MotorMo

    MotorMo Active Member

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    About the RPM's going from 2,100-1,900---My RPM's slightly change as well when my car is running in 'closed loop' and up to (or near) operating temp. I narrowed it down to the primary O2 sensor. With a scan tool, I noted the RPM's go up a little when the O2 senor is reading rich, and goes down a little when its reading lean. This is with a new O2 sensor from Honda. If its easy enough for you, you can always unplug the primary O2 sensor, try to duplicate the issue, and compare results. I now call this rhythm 'her heart beat' haha.

    Had a thought about the A/C low idle issue-- I wonder if your ECU is expecting your engine to have a 'Fast Idle Valve' and thus your idle is lower than it should be. DC2 R's never had the Fast Idle Valve here in America, but we also never saw them until 1997-2001. We always seem to get the short end of the stick. Another example is the older 'GSR' (94-97) came equipped with the Fast Idle Valve, but the 98-01 GSR's didn't- and the ECU was programed for this change.
     
  5. ALEX-CY

    ALEX-CY Active Member

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    if you mean vacuum leak I already check this
     
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  6. ALEX-CY

    ALEX-CY Active Member

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    my car has jdm itr b18cr engine and ecu, so only one o2 sensor and not fast idle valve/ just ab idle valve which is genuine new
     
  7. MotorMo

    MotorMo Active Member

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    Sounds like every thing should be talking to each other properly and 'as designed' then. Does anyone know what octane rating they have in Japan? I heard it was close to 100? Perhaps the ignition curves in the JDM ECU are 'off their mark' for the lower rated octane gas in your area?
     
  8. ALEX-CY

    ALEX-CY Active Member

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    I only use 98 octane. so don't think this is the problem
     
  9. MotorMo

    MotorMo Active Member

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    Rodger that.
     
  10. ALEX-CY

    ALEX-CY Active Member

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    now is summer. still have the problem:nono:
     
  11. Leej8

    Leej8 Well-Known Member

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    Swap ecu with known good one
     
  12. ALEX-CY

    ALEX-CY Active Member

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    I already do this
     
  13. ALEX-CY

    ALEX-CY Active Member

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    just check a/f on idle and is about 20-1 . with a/c on its just stay there. replace fuel pump and o2 sensor , still the same. replace ecu still the same. replace ecu from ek9 (b16b) still the same put with a/c on the a/f ratio go to around 14.5 -1 and everything is working perfect. what do you think? I have to check the obd2b to obd2a adaptor. ( I use dc2 p73 ecu)
    anyone from here have any issues with these adaptors?
     
  14. Buckyy

    Buckyy Active Member

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    Have you tried the little sensor on the intake manifold? If that isn't reading properly it might be mis fueling
     
  15. ALEX-CY

    ALEX-CY Active Member

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    with b16b ecu and the a/c on the a/f ratio is perfect so I don't think that I have any problem with the engine or the a/c.
     
  16. that_civic

    that_civic Well-Known Member

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    Did you say you've checked the TPS readings ? closed and open throttle ?
     
  17. ALEX-CY

    ALEX-CY Active Member

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    yes and the readings are perfect
     

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