Turned out it was the module! All three of them!

I borrwed one from a friend and tried it out on the remote chance that all three of mine were "bad". Looks like mine were bad. I can only think that my earlier grounding issue (during which time all three of these modules were run) somehow caused a malfunction in them. When I put a fresh one in, the code didn't reappear. So I gave my friend's module back, went out and bought a new one and problem solved. Man, I hate crap like that!

Now, for the question. I have my ilde damn near perfect. It pulls a nice 13-14 inHg and is smooth as silk. No bucking or jerking during low speed crawling. BUT, it only lasts when the engine just goes into closed loop (after a cold start) and about five to ten minutes after that.

After driving around a while and heating the engine up, the idle deteriorates a little to some roughness (enough to annoy me) and loses about 1" of vacuum.

I'm looking through the Tunercat program and can't find a whole heck of a lot having do to with coolant temperature vs any steady-state-operation parameter in closed loop. Is there something else not in Tunercat I should be paying attention to that could cause the above issue?

 

Try adding a lil fuel.
As the chambers get hotter, they *need* more fuel.
Too much timing can do it, thou usually, it's a matter of just being a lil lean.

 

Grumpy,

Aside from playing around with the O2 centering voltage, doesn't the fuel trim work the fueling? I'm showing a 128 BLM value during idle. If I "add fuel", the ECM is simply going to remove it.