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Losing power uphill

Discussion in 'Bay Tech Clinic' started by Jenny Frappell, Aug 28, 2019.

  1. Jenny Frappell

    Jenny Frappell Active Member

    Messages:
    245
    Location:
    Bulli Beach
    I am having an issue with my 74 Bay. It is losing power uphills.
    Previously it was not having any problems.
    We have recently put in a new larger battery and electronic ignition. It has new spark plugs, fuses, leads, and fuel filters. The Carbies have been checked and the throttle adjusted.
    It is still not working.
    Any clues? It's very frustrating and I am over handing out cash for it not to be fixed.
    And I want to get to Old Bar......
     
  2. Jenny Frappell

    Jenny Frappell Active Member

    Messages:
    245
    Location:
    Bulli Beach
    I should have added, it is also struggling over 80km and surging.... losing power under load.
     
  3. tintop

    tintop Well-Known Member

    Messages:
    502
    Location:
    Canberra
    Hi Jenny, did the problems start after you did any of the recent maintenance / replacements or was that done because the problem was there? Patrick
     
  4. Jenny Frappell

    Jenny Frappell Active Member

    Messages:
    245
    Location:
    Bulli Beach
    Has happened after electronic ignition and battery was put in. However it ran fine for at least 3 months after.
     
  5. cbus

    cbus Well-Known Member

    Messages:
    11,764
    Location:
    sunshine coast
    Ensure you have good fuel delivery.
    Sounds like fuel starvation.
     
  6. oldman

    oldman Super Moderator Staff Member

    Messages:
    8,531
    Location:
    Avalon Beach NSW
    If EI module is not adjusted properly, it'll not work properly......... a bit like points closed up.
    The air-gap is CRITICAL on these units. I'd be taking it back to whomever did the work.
    Cheers,
    Mark
     
  7. Jenny Frappell

    Jenny Frappell Active Member

    Messages:
    245
    Location:
    Bulli Beach
    Fuel pump?
     
  8. tillis

    tillis Active Member

    Messages:
    202
    Location:
    gold coast
    My Bay was an 1800 and the diaphram on the dizzy developed an airleak and the poor kombi had the symtoms you describe. caused me much frustration til i figured it...just saying...
     
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  9. Luckyphil

    Luckyphil Well-Known Member

    Messages:
    5,992
    Location:
    Gosford
    Isnt it normal for VW's to loose power uphill :)
     
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  10. Barry

    Barry Well-Known Member

    Messages:
    3,661
    Location:
    Abbotsford NSW
    Type 4 twin carb or type 1 single carb or something else?

    More fuel filter and hoses.
    Have you checked or replaced fuel filter?

    Do you have a mechanical pump or electric?

    Do you have access to a timing light?
    Worth checking the timing at idle and full advance.
     
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  11. Barry

    Barry Well-Known Member

    Messages:
    3,661
    Location:
    Abbotsford NSW
    Type 2’s - yes

    :D:D:D:eek::eek::eek:
     
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  12. Wayne murray

    Wayne murray Well-Known Member

    Messages:
    2,931
    Location:
    Seven hills
    type 4 campers yes mine not so much!;)
     
  13. David H

    David H Well-Known Member

    Messages:
    4,831
    Location:
    newcastle
    Okay Jenny,
    I'm with cbus as I was when I read it earlier today. Sounds like not enough fuel. Even tho' you've done all this work when was the last refuel compared to the presentation of the symptoms? A bad dose of fuel can kill a fuel filter real quick. To check take exit hose off fuel filter to see flow rate. Do this into a container & off to one side of you!
    To check Tillis suggestion (which I don't disagree with) blank off dissy diaphragm & drive to see the difference.
    Cheers
     
  14. cbus

    cbus Well-Known Member

    Messages:
    11,764
    Location:
    sunshine coast
    As Barry and Tillis covered.
    First check filter .
    Bad fuel could clog it quickly.?
    Blocked jets possible.
    Pull a hose before pump and check it's flowing ok.
    Although there are situations of blockage that can be missed due to being transitory.
    ie crap in tank over outlet.
    Timing also an easy check and similar symptoms.
    Check that advance is working.

    If lean it will also run hot.

    Is the issue consistant?
    Slow acceleration as well ?

    So , initial checks..
    Fuel hose off pre pump to check fuel flow/ blockage.
    Timing and advance check.
    Check that you are still getting full throttle/ near full opening of carbs via acelerater operation.
    No air leaks on inlet manifolds?

    Read plugs for signs of lean/ hot running directly after hwy run or symptoms exhibiting.

    If you have access to compressed air , use a rag around the air hose to pressurise fuel tank via filler pipe.
    You will get a small blast of air as you release the hose if the pipes are blocked.
    Checking that blocked breather pipes not causing fuel starvation.
    This is usualy shown as poor / lean running on hwy after running some time.
     
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  15. Jenny Frappell

    Jenny Frappell Active Member

    Messages:
    245
    Location:
    Bulli Beach
    I thought that it was a fuel issue because I recently changed garages..... around the same time....
    But all the filters are new and have been checked.
    There was a little sand in the carbs apparently (maybe from the recent sand blasting).
    It is a consistent issue.
    Acceleration is slow. Lucky to get over 80 at present.
    It’s surging. Stalling at lights sometimes, even when warmed up.
    It isn’t running hot.
    Driving me mad because it was running sweet.
     
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  16. Jenny Frappell

    Jenny Frappell Active Member

    Messages:
    245
    Location:
    Bulli Beach
    Not this much.
     
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  17. Jenny Frappell

    Jenny Frappell Active Member

    Messages:
    245
    Location:
    Bulli Beach
    Electric pump.
    Fuel filters replaced, but old ones were ok
     
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  18. cbus

    cbus Well-Known Member

    Messages:
    11,764
    Location:
    sunshine coast
    What media was used in the sand blasting?
    It is illegal to use sand so should be most likely crushed glass,( obvious, ) garnet, (pink coloured,) or black grit.
    If sand , and if sand was not used in blasting, then sand and water usualy gets into fuel when servos fail to allow tanks to settle adequately after a delivery or the tanks are old and need cleaning.
    This is quite common.
    I would check filter again for signs of water or sand. Just in case.
    It could also affect the carbs by blocking jets.

    Check throttle operation yourself.
    Depressed throttle fully and put a brick or old battery etc on it .
    Then in engine bay...attempt to open carb further by hand by pushing on the lever that the cross bar connects to.

    Slow acceleration plus limited top end sounds typical of lack of opening on carbs.

    Establish this first even if garage has said it's ok.
    Same for fuel filter check.
     
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  19. David H

    David H Well-Known Member

    Messages:
    4,831
    Location:
    newcastle
    As cbus says 'only trust what you know'.

    Surge can be spark timing/diaphragm . The lack of 'go' seems to be fuel....not enough. Timing & spark, if they happen any where they need to happen, will still give a 'go forward'.
    Surge = timing/diaphragm leak.
    Lack of go forward= fuel & lack thereof;).
    Never heard of cbus fix before but only thing that runs both symptoms is a tank blockage & fuel starvation randomly. Worth a bit of air pressure to find out/eliminate.
    See you at Old Bar.
    Cheers
     
    Last edited: Aug 29, 2019
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  20. Jenny Frappell

    Jenny Frappell Active Member

    Messages:
    245
    Location:
    Bulli Beach
    Having an air pressure test (compression) on monday.
    Would it be prudent to completely empty the tank?
    I have run it to empty, but haven't completely emptied it, because I still got to the petrol station.
    Hope to get to Old Bar. If I can get up Bulli pass that is.
     
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  21. Barry

    Barry Well-Known Member

    Messages:
    3,661
    Location:
    Abbotsford NSW
    Not in my opinion.
    There will be crap in the base of tank unless you know it’s a new tank.
    Don’t want to be sucking the grunge on the bottom.

    Always best to fill up at the 1/4 tank left
     
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