Re: Coupe won't start :-(

[Huw Powell <human@nh.ultranet.com>]

> I may take a look at the ecu ground at the intake.  I took a cue from you
> and had it powder coated, so I may not be getting a good ground there

Important note regarding fancy painting... make sure your grounds remain
intact!  As such I had to dremel off a bit of paint from my alternator
housing, and at the mounting bolt surfaces for the infold manitake so
the bolts would actually ground it to the block.  Ditto the exh manifold
to make sure the OXS was grounded too.


> I haven't looked at the wiring schematics yet, but is the ecu independent of
> the fpr?

No, it's power supply is coming from the fpr.

> 
> I didn't disconnect anything in the interior when I dropped the engine so
> hopefully nothing in there is hooked up wrong
> 
> The mystery harness may be to the 3 wire oxs.  I think that it came out of
> the loom next to the oxs single wire (green)

Yup, that's it.

> 
> Any idea of the two wires on the drivers floor coming from the general area
> of the fuse box?

the brown/grey one will be some sort of switched ground, the red/blue,
um, that's usually an ignition on wire I think.  Unless it's a lighting
wire.  It may not go to anything, these cars have lots of "spare" wiring
usually.  Could be for an entry light?  been meaning to add some of
those to my car.

> 
> One more thing that I can't seem to find is the vacuum line that goes
> through the firewall to the air plenum.  any idea where this hooks up to the
> engine?

On CIS-E I think it comes from the little outlet on the pipe from the
manifold to the ISV.  This supplies vacuum to the recirculation flap
which is electrically switched but vacuum powered.

On my 82 it used to tap off the side of one of the brake booster vac
lines at the manifold.

-- 
Huw Powell

http://www.humanspeakers.com/audi/

82 Audi Coupe; 84 4kq; 85 Coupe GT