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  • Re: High EGT's and low RPM

    by » 5 months ago


    Tried again today.  No luck.  Never got the rpms up.  Checking all cables and hoses.


  • Re: High EGT's and low RPM

    by » 5 months ago


    "Paul Wrote:

    ... Thought about the clogged air cleaner, that should cause the mixture to richen up I think.  "

     

    A restricted Air filter would just cause the engine to think it was at a much higher altitude with no faults but with the accompanying lack of power.

    Normally the prop would see the thin air also but in this case, the prop would still be heavily loaded while the intake was being strangled.

     

    I am envisioning a loose engine baffle or something else getting sucked up intermittently against the Air filter and then falling clear when the engine shuts down.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: Paul Depperschmidt

  • Re: High EGT's and low RPM

    by » 5 months ago


    Bill Hertzel wrote:

    "Paul Wrote:

    ... Thought about the clogged air cleaner, that should cause the mixture to richen up I think.  "

     

    A restricted Air filter would just cause the engine to think it was at a much higher altitude with no faults but with the accompanying lack of power.

    Normally the prop would see the thin air also but in this case, the prop would still be heavily loaded while the intake was being strangled.

     

    I am envisioning a loose engine baffle or something else getting sucked up intermittently against the Air filter and then falling clear when the engine shuts down.

    Thanks Bill,

    The idea that the engine thinks it is at a higher altitude makes sense.  Today on ground runs the RPM's would rise to 47-4900 RPM with an inch of throttle left.  Pushing the throttle in completely made no change.  Fuel pressures seemed normal, so it should be receiving enough fuel.  I looked at the air filter and removed it to check.  Nothing seems amiss and there does not seem to be anything around it that is loose that could potentially block it.  

    On advice of the tech I have used in the past I pulled all 4 connectors that go to the air intake manifold and sprayed some deoxit in them.  I fired it up again with no change.  

    I also looked at the Manifold Pressure sensor.  Everything looked ok. Would it be possible for that to fail?

    The plane is currently in Cottonwood, AZ.  There is a Rotax IRMT in Prescott, AZ across the mountain.  It seems like I need a download of the ECU to see what is going on.  

    I was getting a Lane B light, but that has been happening for some time.  It will come on at times when the vibrations are highest.  Simply recycling the switch usually makes it go away.  


  • Re: High EGT's and low RPM

    by » 5 months ago


    Paul Wrote:

    I was getting a Lane B light, but that has been happening for some time. 

    It will come on at times when the vibrations are highest. 

    Simply recycling the switch usually makes it go away.  

     

    Power cycling the ECU will clear the Fault lamp. That's how it's done.

    If the engine is talking to you, you should listen!

    Having access to a BUDS Dongle to query the ECU is NOT a luxury item, it is required.

    By all means, download the fault log from the ECU and then Clear the ECU Faults.

    Any fault that reappears will need your attention.

     

    There are two sensors for most everything.

    If one does match the other, the ECU switches to the good one and lights the Fault lamp to alert you to check the ECU Logs for the problem.

    Many faults will place the engine in a crippled state to assure that you can limp back to a runway.

     


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: Paul Depperschmidt

  • Re: High EGT's and low RPM

    by » 5 months ago


    Bill Hertzel wrote:

    Paul Wrote:

    I was getting a Lane B light, but that has been happening for some time. 

    It will come on at times when the vibrations are highest. 

    Simply recycling the switch usually makes it go away.  

     

    Power cycling the ECU will clear the Fault lamp. That's how it's done.

    If the engine is talking to you, you should listen!

    Having access to a BUDS Dongle to query the ECU is NOT a luxury item, it is required.

    By all means, download the fault log from the ECU and then Clear the ECU Faults.

    Any fault that reappears will need your attention.

     

    There are two sensors for most everything.

    If one does match the other, the ECU switches to the good one and lights the Fault lamp to alert you to check the ECU Logs for the problem.

    Many faults will place the engine in a crippled state to assure that you can limp back to a runway.

     

    Bill,

    I don't have a dongle.  I see there are three levels.  Clearly level 3 is out for me.  But would it be better to get a level 1 or level 2?


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