Diagnose This: Episode 1

[johncworden at verizon.net (John C. Worden)]

>Eric, I have had clogged cats in two vehicles and this sounds like what
you have. I would definitely check that out, especially since it's is acting
the same with a different motor.

John




>>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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>>Scirocco-l mailing list
>>Scirocco-l@scirocco.org
>>http://neubayern.net/mailman/listinfo/scirocco-l
>
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