Re: VR6 oil leaks:[Was] Synthetic trans oil

[ANDREW_ATWELL@HP-PaloAlto-om20.om.hp.com]

     I've heard this too.  My main problem turned out to be a bad wiring 
     harness that was droping a volt along the way to the ECU causing the 
     car to de-tune it's self.  Once this was fixed the idle was back to 
     its "normal" lopy idle.
     andy


______________________________ Reply Separator _________________________________
Subject: Re: VR6 oil leaks:[Was] Synthetic trans oil
Author:  Non-HP-cmorgan02 (cmorgan02@sprynet.com) at HP-PaloAlto,mimegw6
Date:    10/1/97 10:34 PM


> From: ANDREW_ATWELL@HP-PaloAlto-om20.om.hp.com 
> ...mysterious rough engine idle...
     
My '93 Passat (and most of the '96 and earlier VR6 cars I've driven) had an 
intermittent rough idle that was never cured.  Surprisingly, not too many 
people complainted about it, and one magazine even thought the motor was 
cool because of its "cammy" idle.  I found it annoying, especially when my 
mom's '94 4cyl Jetta GLS idled perfectly.  Anyway, I've been thinking it 
has something to do with the different intake/exhaust tract shapes (and 
maybe the relative injector placement, too) of the front cylinders vs. the 
rears, causing a minor difference in power output between the front and 
rear cylinders, combined with the firing order (1-5-3-2-6-4, I think, front 
three cylinders fire and then rear three fire, etc.), which causes slight 
idle speed fluctuations that the idle stabilizer valve plays catch-up with.
 Am I making any sense?  I could be completely wrong, but I do know that
the '97s and their new IS system are much better than before.
     
- -Chris