Weird MC engine problem
jeg1976 at yahoo.com
Fri Aug 9 11:47:25 EDT 2002
Good to hear from you Phil!
--- Phil Payne <quattro at isham-research.com> 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.
> 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
> 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.
You say you rebuilt the electronics, I know I had one
of my main power relay's go out once, caused all kinds
of problems. The only way I figured it out was it was
hotter than hell when I put my hand on it. It sounds
like something is shorting out. Could be that
ignition switch? I don't know haw that would be load
dependant though. Damn, this is a tough one.
'89 90tq 034EFI, Haltech IG5
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