Weird MC engine problem

james accordino ssgacc at
Fri Aug 9 16:46:10 EDT 2002

It took me 8 days to finally figure out/get running my
current 89 200q (junkyard edition) that had been
sitting for at least a year after it was repo'd.
Almost 100k since, and I wouldn't have it any other
way.  Very satisfying when you finally figure it out.

Jim Accordino

--- Phil Payne <quattro at> wrote:
> Before I start - this car is a dog.
> It's an Audi 200TQ (5000) with an MC engine run by a
> MAC14.  It was off the road for an
> unspecified period, believed to be long, and then
> had some kind of electrical event.
> Basically every component on the auxiliary relay
> panel with a transistor in it was fried.
> So were a few other things - like the central
> locking pump ...
> The ignition switch is also extremely suspect and
> the tachometer and trip computer are dead.
> Anyway - I've gutted and rebuilt the electrics.  The
> diagnostics run and the ECU stores no
> codes.  The car will start and idle from cold - duty
> cycle is 50%ish at idle, ISV current 440
> milliamps.
> If you try and put any appreciable load on the car,
> it dies instantly and won't restart.  At
> this time, an attached code-pulling LED illuminates
> permanently.  If you cycle the ignition,
> it comes back on with ECU power.
> I've swapped the ECU and coil pack for known good
> ones and tested the swapped ones in another
> car.  Also the control pressure regulator.  The fuel
> pump has been swapped - pressures and
> flows are within specification.
> --
>   Phil Payne
>   +44 7785 302 803
>   +49 173 6242039

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