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Thread: leaning out on warm idle and off accelerator pedal

  1. #21
    adaxo's Avatar

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    Correct me if im wrong but fassi1 and rest give different values as you measure it in different part of plenum? IE all readings via boost controllers are AFTER TB and actually vacuum should be measured before? it may be not the case al all, not sure
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  2. #22

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    Depemds on what do you understand by before or after throttle body. You know exactly Adam what meassurement I have in mind.
    Meassurement has to be taken somewhere next to the brake servo connection to the plenum.

  3. #23
    Confused's Avatar

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    I saw around 18-20 inHg on my Anglia last night at idle. This is around 8.8-9.8 psi, 0.60-0.67 bar.

    Taken from the usual place - on the plenum, between the throttlebody and the valves!

    On deceleration this goes to around 23 inHg - about 12.3 psi, 0.84 bar.

  4. #24

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    Quote Originally Posted by Confused View Post
    I saw around 18-20 inHg on my Anglia last night at idle. This is around 8.8-9.8 psi, 0.60-0.67 bar.

    Taken from the usual place - on the plenum, between the throttlebody and the valves!

    On deceleration this goes to around 23 inHg - about 12.3 psi, 0.84 bar.
    On deceleration ( CUT OFF ) sounds about right but if idle was with no load at all, sounds too high to me.

  5. #25
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    Quote Originally Posted by fassi1 View Post
    On deceleration ( CUT OFF ) sounds about right but if idle was with no load at all, sounds too high to me.
    is this before or after you did all you inlet pipework modifications.

    Bye for Now!

  6. #26

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    Quote Originally Posted by Davezj View Post
    is this before or after you did all you inlet pipework modifications.
    That was after.
    This is screen shot from LPG software live data which has its own MAP sensor. This is from almost fully warm engine.
    MAP 0.28bar
    Attached Images Attached Images

  7. #27
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    i understand what you are talking about with regard to the MAP sensor in the LPG system.

    one of the sensors must not be operating correctly at the bottom end of its range. if my memory is correct my map sensor in the LPG system reads about the same as yours but my boost gauge reads the vacuum measurement i referenced in mmHg above, both being connected to the plenum chamber at the back.
    It would be interesting to see what happens if i disconnect both of mine and put a vacuum gauge pump on each and measure the reading. or put both on the vacuum pump at the same time.

    maybe this weekend.

  8. #28

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    They must be out like you are saying Dave.
    I do trust lpg MAP sensor. My Outback H6 has factory MAP sensor and its readings are identical to lpg MAP sensor.

  9. #29
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    I will have to try it.

    Sent from my MI 5s using Tapatalk

  10. #30
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    So guys. I have the first results. I guess my issue is due to a faulty ICV. At least you cannot hear it moving with IGN on before actually turning over the engine.

    Yesterday I cleaned the ICV and put it back in before actually starting the engine. I also had the PLX wideband heating up the O2 sensor until it detected air.

    Since then, car runs and idles fine. The actual idle RPM's are at around 800-900 once warmed up and during warming up the RPMs are on the higher side as well - again, due to the ICV me thinks. I have to find the replacement one I keep in the shed and this will then show if it was that. AFR's stay close to or around 14.7 mark now. On idle it is going eventually to 17 but not leaner.

    Other than that, I do not seem to have any boost leak. @foxdie -> Now it actually goes up to close to 1 bar of boost when pushed. Remember your comments from the RR?

    My vacuum readings are (taken from the intake manifold to stepmotor gauge):
    - idle warm = approx 0.72 bar
    - deceleration = up to 0.9 bar

    I will post again, once ICV has been replaced. But my other conclusion is, that - even if not needed - recalibrating the O2 sensor from time to time even on the PLX cannot harm.
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  11. #31

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    Sounds good Stefan, glad you managed to find the reason of your problem.
    Vacuum sounds ok. Idle rpm on warm sounds bit too high, it should be around 700rpm.

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