[s-cars] Cleaned cats, stumble and cut-out

[djdawson2 at aol.com]

Jim,

Having driven your car, I seriously doubt that your issue is coil or plug related.  Your car is exhibiting the complete shutdown symptoms of an ECU sensing overboost.  It isn't a misfire, it isn't one or two cylinders... it's a full shutdown.

IMO, you're probably looking in the wrong place.

I do wonder about the WGFV.  Can they fail to the point where they respond too slow?  I don't know the answer, but that is what ultimately controls max boost.

You could get your little vice grips back out and clamp the WG line again.  Typically, the WG spring alone won't allow much more than 15psi.  I would not be surprised that if you clamped it off, you would avoid reaching overboost and/or shutdown.

I truly believe your fuel pump is being shut off by the ECU.

Dave

 

 

 

-----Original Message-----
From: Jim Fleischer <jim at almgt.com>
To: s-car-list <s-car-list at audifans.com>
Sent: Tue, Sep 18, 2012 12:00 pm
Subject: [s-cars] Cleaned cats, stumble and cut-out


Thanks all who have helped me out with their suggestions......here's a response 
that hopefully addresses all points.....

As far as emissions is concerned, I have Montana permanent plates, and don't 
require emissions testing.  That said, my environmental conscience will dictate 
getting new cats eventually.

I've checked all boost hoses, cleaned the MAF and other assorted sensors as 
blinked codes have dictated. Currently throwing no codes, but still 
stumbling/cutting out.

I've been pulling the ECU fuses to clear the codes each time I mess with stuff.

I have yet to check into the ignition wires, etc. Hopefully will get to that 
this week (maybe today).  At 140K miles and original coils, odds are that might 
be my issue.  Does any of the diagnostic software address the ignition system?

Is there any way, besides pulling the injectors, to test the coils?  My problem 
seems to be only on full boost, so I don't think the injector test is going to 
help me out. Thoughts?

Thanks again all.....I truly appreciate the thoughtful suggestions that have me 
boosting at the moment.

Best regards,

Jim Fleischer
'95 urS6 avant, getting out of it's own way
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