Hi,
I have a 99 E350 V10. Runs great but when I kick on the A/C the van will die when I slow down or come to a stop. Only happens when the A/C is running. Anyone else run into this problem?
Thanks for any help.

 

There's only one thing that controls the idle. the IAC, ob the back of the throttle assembly. Do you have access to a scan tool to make sure the PCM is seeing that the air is on? Ususally dont by one of the pressure switches, since you have no problems at any other time i doubt the IAC is the problem, I would think the ECM is not seeing the signal the A/C is on, you have to check your pressure switches or the wiring coming from them.

 

The PCM closes the ground on the A/C clutch relay ~ so It SHOULD know It's "On"... : ?

Also consider:

Is the A/C Compressor draggin' or trying to SEIZE-UP : ?

Is the A/C system OVERCHARGED and being operated in a HOT ENVIRONMENT : ?

Is the MAF contaminated (and therefore Out-of-range) just enough to cause the Stalling under loading of the A/C : ?