dave wrote:
> Try turning the CO adjustment screw for best idle and see what that does.
> Then turning that screw out (CCW) should lean the CO and the engine should
> become more responsive.
> Adjusting that screw should have an effect on off-idle response too AFAIK.

This is the 3mm screw below the hole by the fuel distributor, right?
So screwing it in (CW) should richen the mixture?

> Do you have a CO analyzer at your shop?

No.

> Do you analyzer how rich the engine is running by examining the spark plugs
> at different times, like after a WOT run then turning the engine off to see
> what color the spark plug tips are, or after a cruise down the expressway,
> etc.?

I do read the plugs occasionally, but it hasn't run well enough so far.
I'm in the "rough" tuning stage now.

> You can, or should be able to, hook your VOM in series up to the Fuel
> Pressure Regulator to read it's voltage.

I was told by a VW tech that the O2 sensor wasn't getting hot enough to
do that, due to a convertor whose guts were gone. O2 sensor is in the
cat convertor shell, shielded from direct exhaust flow. So I haven't
done that.

>
>
> "Rex B" > wrote in message
> ...
>
>>OK guys, here's where I'm at now with this (formerly) dead VW:
>>
>>After going through everything from air cleaner to intake, repairing what
>>little I could find wrong, replacing all suspect vac hoses, and fixing one
>>vacuum leak, I got it where I could drive it - barely. It's obviously
>>running way lean, because once I get the throttle into the WOT enrichment,
>>it wakes up immediately.
>> I know the rice-rocket shop turned the fuel distributor adjustment
>>screw a bunch, not knowing what they were doing. My question is, does that
>>have an effect on the basic running mixture (as opposed to idle only)?
>>Can I expect to crank the 3mm adjustment screw a little at a time and
>>bring the mixture into a drivable range?
>> I know the correct way to do this is with an ammeter reading the o2
>>sensor circuit, but the o2 sensor does not get hot enough to operate for
>>this purpose. Remember this is a race car, and most people racing these
>>effectively bypass the o2 sensor and treat it as a straight CIS system.
>>--
>>- -
>>Rex Burkheimer
>>WM Automotive
>>Fort Worth TX
>
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