[Shotimes] Leaning out @ part throttle - opinions please

[Timothy Tyner]

Here is a brief history: When I first got the car running, my 90mm MAF was 
wired backward. So the EEC was reding a full voltage at all times. CE lights 
on, MAF codes, etc, but the car ran decently enough, so that I drove it on a 
140mile trip, and got 20mpg. Still, it was far from perfect, and I knew it 
needed some changes. Well, once I datalogged it and saw my MAF values 
(DOH!), I wired it up right and took it for a spin. WOT was AMAZING, car was 
very quick, all readings looked spot on and no CE lights, no codes.

But for some reason, I could not drive the car part throttle. Try and cruise 
for 5 seconds and my WB was looking like an oscilliscope (sp?), car would 
lean out and try to die. Well, it seemed my old fix to a HEGO was no longer 
working (wire had melted once, I rewired it, but it needed a new one). Well, 
I had a new harness, wired it in, got two new HEGO's, and went to town. Now 
the HEGO readings were where they should be. A full datalog showed my LAMBSE 
and KAMRF values were what you would expect, all other values good as well, 
but still the part throttle leaning out.

This is what I know, MAF read correctly, TPS is new and reads correctly, car 
has the air/spark/fuel to make made power, and runs awesome once in WOT, but 
awful in closed loop. This is what has been replaced with the last turbo 
swap: turbo, BOV, WG, trans, halfshafts etc. All of those of course not 
having an affect on my problem. BUT, I also removed the FMU, added the FPR 
(and yes, fp checked out great), removed CC, and rerouted a number of vacuum 
lines.

So, cliff notes: WOT = great, part throttle = crap - car leans out and dies 
within seconds. No CE lights, no codes. Idles good (though it take a while 
for it to drop below 17:1, is this normal?), datalogs from Tweecer give no 
evidence of a problem. My question to the forum, what is the problem? What 
would only present itself @ part throttle, but let the car run amazing @ 
WOT? I await your answers (and as always, a prize for the problem solver, 
how does driving the turbo at Memphis for a few laps sound?).

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