Can somebody ID this new idle quirk?, starts & runs well -- until warm Options

[Prospectfarms]

(IMG:style_emoticons/default/beer3.gif) (IMG:style_emoticons/default/beer3.gif) (IMG:style_emoticons/default/beer3.gif)

O.K., I'm better now... D-jet is driving me to drink.

The 1.7 starts and runs well until it warms up. After 10 min. idling smoothly @ 900 it hesitates two or three times and stops idling at all, which means I can't keep it running long enough to set the timing. I can keep it going by feathering the throttle, but my nice smooth idle is gone. I reproduced the symptom three times in a row today.

By clamping off the Vac hoses one-by-one it appears the FI components seem to be doing what they're supposed to. No other vacuum or capacitance probs. found so far. Haven't checked the injectors.

This started after I repaired the ground strap on my distributor -- must have bumped something else. CHT?

I have the FI diagnostic checklists and am working on them. If this was a carburetor I'd say it was running with a clogged idle jet (IMG:style_emoticons/default/wacko.gif) . These symptoms seem specific and uncommon. At least I've not seen others posts that describe the same thing. Did I miss one?

[Tom]

From above;
Great info! thanks. Assumed incorrectly that without extra fuel delivery, an open AAR would over lean the idle mixture -- ECU must adjust for proper mixture some other way.
The ECU adjusts fuel mixture based on several inputs, one of which is RPM's.

I think vsg914 has a good test for you, although I would do it a little differently. Start car normally when cold, after about one min, close off the hose to the AAR from the air cleaner by pinching it with some pliers. If the engins stalls, you have the idle set too low. As others have said, with the AAR operating and open, your idle should be 1500 or so.
Tom