Results 1 to 5 of 5

Thread: Excessive leaness

  1. #1
    Join Date
    May 2003
    Location
    Sunny Coast QLD
    Posts
    25,495

    Excessive leaness

    sigh,
    4.6 seq LPG inj. OMLV dream 21?

    car stalled on take off (LPG) a couple of times lately,,
    car has ERRORS excessive leaness on both banks,(ASSUMING LPG)
    car sometimes flutters on highway,, (funny that--)

    Please dont tell me to get it Dyno'd,,
    'Cos I can tell you it makes more HP on LPG than PULP,,
    Dyno guy says LPG is mimiking PULP properly,,


    but it cant be,, right?
    PULP LTFT's are single figures ALL the time,,,
    LPG LTFT's down the highway go to max 25+,,


    28 pulls on the dyno over two visits and two fuels,,
    I have complete confidence in the Dyno Guy,,

    sigh,,
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to ???
    Its a gas gas gas Tug?


    Golf GTX Tourer MKIII 19' of Heaven


  2. #2
    Join Date
    May 2003
    Location
    Sunny Coast QLD
    Posts
    25,495
    I havent serviced the LPG system,, and its been with me for 100K,,

    I sometimes get a LPG wiff out the back,, sometimes,,
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to ???
    Its a gas gas gas Tug?


    Golf GTX Tourer MKIII 19' of Heaven


  3. #3
    Join Date
    Apr 2009
    Location
    Crafers West South Australia
    Posts
    9,893
    Without a laptop plugged into the LPG ECU you're wasting your time. When I tune injected LPG I massage the LPG map to reduce fuel trims to the absolute minimum. I do this during a road trip, not on a dyno, and stop occasionally to adjust the map. Usually this process takes me 1/2 an hour or so. A poorly adjusted map may well run just fine but as you have found out the fuel trims will get a workout.

    On the mechanical side it's possible your OMVL regulator is boggered, I never had much time for those things as they are difficult to service and have no easy adjuster for the pressure. With the software connected you would be able to see a pressure drop.

    LPG whiff is unburnt fuel, both rich and lean can cause that due to incomplete combustion.

  4. #4
    Join Date
    May 2003
    Location
    Sunny Coast QLD
    Posts
    25,495
    Thanks Bee utey,,
    those 28 dyno runs had a laptop plugged in,,
    I can only ASSUME Rob had it plugged in on his road trip down the Highway,,
    I can only ASSUME the laptop would show LTFT's,, (but maybe not otherwise???) mixture--
    The regulator is less than 40K old,, replaced it on our trip,,
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to ???
    Its a gas gas gas Tug?


    Golf GTX Tourer MKIII 19' of Heaven


  5. #5
    Join Date
    Apr 2009
    Location
    Crafers West South Australia
    Posts
    9,893
    Quote Originally Posted by Pedro_The_Swift View Post
    Thanks Bee utey,,
    those 28 dyno runs had a laptop plugged in,,
    I can only ASSUME Rob had it plugged in on his road trip down the Highway,,
    I can only ASSUME the laptop would show LTFT's,, (but maybe not otherwise???) mixture--
    The regulator is less than 40K old,, replaced it on our trip,,
    It depends on the connection of the LPG ECU to the vehicle diagnostic port, OBD2 wiring didn't really get fitted to them before 2010 or so. Nothing stopping the mechanic from using a separate plug in tester though. Early systems had the ability to read the O2 sensors although they weren't used for adjustment, just display. Not all fitters bothered though as other tuning methods can be used. Testing can of course be done the old fashioned way by watching the petrol injector times when you swap fuels. If your engine ECU needs to change the times by a significant amount when LPG is running then the mapping is poor.

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Search AULRO.com ONLY!
Search All the Web!