Diagnose This: Episode 1

[pats16v at columbus.rr.com (Erik Patterson)]

Clooged Cat would be my vote.

E
----- Original Message ----- 
From: "Eric S" <scirocco@vintagewatercooleds.com>
To: <scirocco-l@scirocco.org>
Sent: Saturday, May 20, 2006 3:30 PM
Subject: Diagnose This: Episode 1


>
> On this episode of Diagnose This we bring to you one sluggish VW Fox.
>
> Patient details:
>
> 1990 VW Fox Wagon
> 1.6 liter, Heron Head 8v, 9.5:1 compression
> Stock CIS-E
> Stock Exhaust
> Iginition timing at 8 degrees
> Cam timing advanced 1 tooth, this rasied our compression to 160 psi a cyl!
>
> Symptoms:
>
> 1. Slow to rev even just idling and bliping the throttle
> 2. Super slow, can barley maintain 80 mph, making maybe 60-70 hp on the
> butt dyno
> 3. Runs excellent, idle smooth, a soft miss when under load, more of a
> surging really
> 4. Plugs show proper mixture, O2 system not having to do any adjustments,
> and confirmed its operating correctly (ground the O2 wire, it idles up,
> then loads up and starts to falter, give it 12vs it dies, no change in
> idle speed with O2 unhooked or hooked)
> 5. Car just feels like it can't breath, similar to how the previous 1.8
> acted, but now much more pronounced with the 1.6
>
> Possible causes (feel free to add on here and "vote" for your diagnosis):
>
> 1. Cam timing? I am already 1 tooth advanced, this got me to the proper
> comression
>
> 2. Cat clogged? This could explain why I hated the 1.8 so much, and the
> sluggishness to rev
>
> 3. Intake/Injection issues?  Fox intake is one of the best flowing from
> what I have heard?  Its all the stock Fox CIS-E stuff, just with the
> shrouds knocked off the injectors.   Cannot check DPR current (don't have
> the harness).
>
>
> -- 
> Eric
> www.vintagewatercooleds.com
>
> 1979 Dasher Coupe 2.0 8v
> 1981 Scirocco S (TDI swap project)
> 1990 Corrado TDI
> 1990 Fox Wagon 1.6 Heron Head 8v
> 1991 Cabriolet (2.0 crossflow 8v project)
>
>
>
>
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