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  1. #1
    Biodiesel Purrrr

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    what is 50A fuse next to ECU?

    further to this post about poor cold-starting
    TDi (not so cold) starting problems...

    I was checking connections and wiring...
    Looking inside the ECU box there are 3 relays and 4 fuses - 2 of them mega-fuses, 50A and 80A

    Anyone know what the 50A fuse is linked to?

    the 50A fuse was not blown but the plastic and the fuse and holder was slightly melted in some areas

    I have cleaned the contacts, used semiconductor paste and replaced with new fuse...
    will be keeping an eye on the new one to see if it overheats too -
    I'm hoping the melting was caused by a poor contact or badly made fuse?

    P)
    TDi Biodiesel sippin' A4 Avant - EGR blanked
    "Cars are good but Jeremy Clarkson is a dick."



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  3. #2
    "Stick a V8 in it!"

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    As far as i can see, the 80A fuse is for the glow plugs, and the 50A one and the 25A one next to it is for some sort of electric coolant heater?

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
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  4. #3
    Biodiesel Purrrr

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    thanks,
    electric coolant heater? how odd...
    was hoping it was something to do with glowplugs
    but 80A fuse seems fine
    back to head-scratching...
    P)
    TDi Biodiesel sippin' A4 Avant - EGR blanked
    "Cars are good but Jeremy Clarkson is a dick."



  5. #4
    Biodiesel Purrrr

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    UPDATE:
    the odd thing is - when I replaced this fuse with a new one and cleaned + silicon semiconductor pasted the contacts...
    the car starts fine, and sounds smoother whilst engine is cold!
    less vibration or run-on when turning the ignition off too.

    I did also put silicon semiconductor paste onto the contacts of the relays in the ECU box,

    but all seems ok for the last few days

    worth checking if you have starting issues on a TDi AFN I'd say...
    TDi Biodiesel sippin' A4 Avant - EGR blanked
    "Cars are good but Jeremy Clarkson is a dick."



 

 

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