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Thread: MK1 Audi A3 1.9 TDi not starting

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  1. MK1 Audi A3 1.9 TDi not starting 
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    Hi Guys,

    I've got a 1983 VW T25 Westfalia with a Mk1 Audi A3 1.9TDi engine dropped into her - its an AHU 39 engine.



    She turns over a good'en, but will not fire up.


    AA man said it was possibly the Potentiometer or the EGR valve. As its old, it has no diagnostic socket to plug into.


    Just had a couple of guys I know take a look. Its getting fuel, injectors bled, its getting air, glow plugs are getting power.....just wont fire up. They played around with it for nearly 2 hours.

    Is it what the AA man said or is it something else?

    Please help.


     
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  2. Re: MK1 Audi A3 1.9 TDi not starting 
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    The AHU ECU has good diagnostic abilities, these have not been made available which is a common transplant problem as most mechanics can do the spanner work but the electrics get bodged, the vast majority cannot read a VAG current flow diagram even if they could get their hands on one. If I was doing it the first step would be to get comms with the ECU as it could be something really simple upsetting it, you need someone who can deal with the wiring side to get things working, make comms, eliminate all error codes and go from there using measuring block info if a code read does not help, the first one would be cranking RPM.
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  3. Re: MK1 Audi A3 1.9 TDi not starting 
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    Thanks, sounds like a good place to start.
     
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