[V8] Who Works on ECUs?

[Coleman, David]

I should second Steve's statement about the complexity of changing chips
in these motronic ECUs.  My 5-speed ECU got drenched and was, as far as
I was concerned, unfixable.  Luckily Audi Connection hooked me up with a
replacement for a great price, and I was off and running.   But just for
the halibut I dis/re-assembled my old one, and I wouldn't do it again --
not on one I plan to actually use.

After all the trouble of finding a fix for yours (not to mention the
unsure-ness of whether or not it's actually fixed right), I think the
safe money is with a used one.  And if a 5-speed version is unavailable,
perhaps AC or someone can put you on a "waiting list", and use the auto
version in the interim.   I believe Keith et al has made the
determination that there is different mapping between the 5-speed and
automatic ECUs, and it's possible (probable?) that that's where your
high idle comes from.

DaveC.




> ... when you do get to swapping chips, make sure you know how 
> to get the circuit boards apart ... the upper circuit board 
> holds one row of pins for the external interface connector, 
> and you've got to do some fancy footwork to disengage the 
> pins from the connector ...
> 
> Steve B
> San Jose, CA (USA)
> 
> ----- Original Message -----
> Bad back has forced me to take it into a reputable shop (not 
> sure which hurts more), so I don't have all answers at my 
> fingertips.  They did look for vacuum leaks and checked the 
> cruise control.  Accelerator cable was binding slightly and 
> has been replaced.  The ISV is new; old one was throwing a 
> code (short to ground) and had about 70k miles on it, and 
> cleaning had no effect.  Speed sensor is also new.
> 
> I'll ask whether idle changed when unplugging ISV but assume 
> that it did.
> It really sounds like when the speed sensor input gets 
> screwed up, the ECU clamps the idle output.
> 
> So does anyone know who works on these (my soldering skills 
> are mediocre, and the shop has the car) or what is a 
> reasonable price from a yard?  Sounds like a computer from an 
> automatic should be ok, and I should be able to swap the chips.
> 
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