I removed the temp sensor and the van ran wicked rich. I believe the
resistance of the temp sender drops from around 3000 cold to around 300 ohms
when the engine is at temp. I checked it while cold and read 3K ohms. I'll
have to go back and take another look at it.

The O2 voltages I measured were made with the O2 sensor disconnected causing
the FI to stay open loop.

Gary

Gary McEachern, Reading Ma.

Remove the coolant temp sensor for the ECU - does the idle smooth out?
Seeing how you replaced the AFM and still have the problems this is one of
the other "influential" items for the ECU - better yet, get a 15K Ohm
resistor and install this across the terminals of the coolant temp sensor -
this will make the ECU think the engine coolant is warm and everything is
fine.

The O2 sensor should be 0.7V and fluctuating up and down 0.2V or so - this
could be the source of the problem, however, unplug the O2 sensor and see if
the idle smoothes out.

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