horhay1946

I have a 93 FD with a relative new engine. When the engine is cold and when coming up to a stop the engine will stall. After the engine warms up and the whole engine is heat soaked the stalling goes away. I am wondering if this could be a sticky idle air control valve or is it tuning. I recently put a new dashpot on and that helped some but the part when the engine is cold. Anybody have a suggestion.

FDAUTO

iTrader: (4)

Stock ecu?

horhay1946

Nope Apexi FC with commander and data logit

FDAUTO

iTrader: (4)

From the home screen on the commander...
setting--->rev/idle---->f/c a.e 1800

All the f/c values you will change to 1800. It will fix your problem

horhay1946

Thanks for the suggestion. I changed the values and saw a little improvement. The problem is only when the engine is cold but when it warms up there are no problems. The problem seems to be a sticky IAC which cannot open the flow fast enough to keep the engine running when coming to a stop. Before I spring for another IAC are there any more parameters that affect idle or something like a choke setting.

Thanks

DaveW

Wild guess, but...
If the secondary throttle plates are not closing all the way (or there is a vacuum leak), that can cause a lean idle condition which would be more obvious cold and could cause stalling.

gracer7-rx7

iTrader: (16)

Have you checked engagement of the wax rod and related idle screws on the throttle body?

FDAUTO

iTrader: (4)

another issue could be the could be the fuel correction for that temperature range could need adjustment. it would depend on what afr you were seeing though. before searching for a mechanical issue, it would be best to all the way rule out the possibility of simply needing a correction in the map. since turning the fuel cut restore to be higher had an impact, there's a chance that it simply needs more fuel in the colder temp range