have a 1992 3.0 aerostar. 90k miles. Was running great until about two months ago. When in the morning I would start it an it would surge from stalling to idle. If I accelerated for 10 seconds it would run fine the rest of the day. Last Sunday I started it
It stalled out and wouldn’t start. It starts now but the engine runs really
Rich. Black smoke out the exhaust. Does anyone know if there is a common?
Problem like this out there, that usually turns out to be the some switch.
I changed the oxygen sensor, throttle position, fuel reg value. When I start it cold
runs not bad for a minute or so then starts with the rich mixture. running out of things to
replace.

I would like to narrow it down to a few things if possible anyone have any Idea
Its a good van but has a senor or something screwing things up.

thanks

 

Try to check for codes on the ECU. If it only seem to be something about the cold start, then try replacing the ECT sensor, it near the thremostat.