[mark houghton]

Hey, we all like simple fixes....glad yours was as easy as a bad connection. I need people like Ronnie to keep me from over diagnosing...but wtf, here goes anyway.

So, bad connections at the coil.....what, = poor spark? Trying to understand why this caused and fixed your problem. Bad spark would mean poor combustion, which would leave un-burned O2, which would cause a high AFR reading out the tail pipe (that's how these AFR gauges work, they look at oxygen content and can be misleading when it comes to poor ignition).

Plus, I don't understand the comment "as it went to closed loop". I believe the Lambda system is always in closed loop, and adjustments to the AFR are the result of the computer (for lack of a better word) sensing the O2 in the exhaust via the O2 sensor and adjusting the frequency valve duty cycle accordingly. Open loop would happen only when the O2 sensor is unplugged and the frequency valve defaults to 50% duty cycle. Admittedly, I haven't run with the Lambda system for years and am probably forgetting something about it.

After the first few minutes of warmup, the WUR control pressure changes (increases) and your mixture will lean out (AFR's go up). I don't think there's any active temperature feedback to the Lambda circuits, though.

Just doing a random mind dump here, clouding the obvious and confusing the issue I'm sure!!!