update on project 4ktq

[Huw Powell]

> I finally figured out that the engine was starving for fuel so I have
> been slowly turning in the CO screw and things keep getting better.

Uh, yeah, ok.  Are you measuring the control actuator current at "idle" 
yet?  I put idle in quotes, because your ecu does not know it's supposed 
to be idling...

> Timing is at 6 degrees and the vacuum advance is plugged off for now.

Well, that's half right.  You should hook up that advance line.

> At idle the 02 voltmeter is reading from .39-.59  I am not sure what
> it should be...  

It should be cycling, roughly over a .2 to .7 volt range, over a couple 
of seconds per cycle.  If it is steady, the "system" is not working right.

>   I have noticed that the idle doesn't want to come
> down after the engine is revved - it comes down real slow, but that
> is probably due to the closed throttle and wot switches not being
> there. 

Without the closed throttle switch, the ECU does not even know you are 
idling, when it does know, it does a few things - one is to cut the fuel 
radically over about 1400 rpms, to bring the revs down.  Another is to 
run the ISV to maintain idle rpms.

> the other problem I have is massive hesitation if I try to
> drive it. 

Well, yes, I wouldn't expect it to "work" as currently set up.  You need 
to get that CIS-E system all the signals it needs, and hook up all its 
outputs correctly.  Surely you can make some brackets for the idle and 
WOT switches?

> I also noticed that as soon as I try to drive it the o2
> volts fall to .0x-.1x instead of being .5 or whatever it should be.
> I think I may possibly have a bad o2 sensor but not sure...

It could be, but with the CIS-E not being all connected, and the static 
mixture setting perhaps still being wrong, there's no way to know yet. 
You could still be way too lean or rich.

> It is getting closer but I could use some input on what to look for
> next.  I can't hear any more vacuum leaks and I couldn't find any
> with starting fluid, and the idle is pretty solid but a little too
> high...

Treat the car as if you are simply running a stock engine with CIS-E - 
ie, get the CIS-E "troubleshooted" and running properly first.  Then 
worry about any other factors that may be due to your having added a 
turbocharger.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/