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Thread: Mk4 1.9TDI Auto difficult to start then loses power until I rev it hard

  1. #1
    Junior Member
    Join Date
    Feb 2020
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    Mk4 1.9TDI Auto difficult to start then loses power until I rev it hard

    Good evening,

    I've been given this car as a bit of project. I've never owned a diesel and my other car is LPG.

    The key problem is this. Takes 8-10 turnovers to start. Then I get a plume of smoke after it starts. When I pull off the power is low. If I put it into neutral then rev it (5000rpm) I then get good power and runs well.

    Things I have have tried so far;

    New glow plugs (they were all over on the multi-meter)
    New air and fuel filters

    No change to problem.

    Can't see any fuel leaks.

    No fault light on the dash

    It feels to me something like fuel starvation/fuel not pressuring? Should I be thinking of diesel pump.

    Any advice guidance would be gratefully received.

  2. #2
    Administrator Crasher's Avatar
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    Apr 2006
    Nottingham, England
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    So you have thrown parts and money at it but not had a fault code read done just because the engine management warning light is not on?
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (28 September 1868 13 April 1956)

  3. #3
    Administrator Keithuk's Avatar
    Join Date
    Jun 2012
    Stoke on Trent
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    First posts normally go in introductions else you could get a free fix and we never see you again!!!

    As suggested: You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.

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