93 302 idles good when cold

once warm won't idle,engine misses,while driving if i let go of throtle idle
drops so low it stalls

changed plugs,rotor,cap,o2 sensor
any ideas please

been reading forum for 4 months very helpful

 

...Welcome to Ford Truck Enthusiasts!
Stick around someone will be by shortly to answer your question.
We are pleased you have chosen the best source for Fords!

Enjoy FTE
…..See you on the boards.

 

Welcome to FTE.

I dont wanna sound like a jerk, but if youve been reading for 4 months, I msure you know the first thing you should have done is to run an EEC self test, what codes do you have? post up your codes and lets go from there.

 

Check out the Idle Air Control valve, that could be your problem. That or a vacuum leak.

 

I've been having this problem since the last subzero temp period. When starting cold, I've had extremely rich conditions. Engine lopes bad when warming up. I replaced; Heated Oxegen Sensor, Fuel filter, spark plugs, air filter, IAC, MAP. I've cleaned the throttle body, cleaned and tested EGR, tested ECT, IAT, EVP. I am still getting a rich lopeing condition at cold startup and it takes it much longer to warm than it used to. I got me a code reader and checked codes; KOEO I got (11) system passed, In memory I got (33) EGR fault/ not closing (34) EVAP control fault, (41) No HEGO switching detected. next ran KOER test, results; (42) HEGO sensor voltage high/ system rich, (18) Spout circuit open - Spark Angle Word (SAW) failure.

All I can think is to test the HEGO, but my Chilton book says how to check, but tells me the voltage values are on a table that is not there! I also have a miniscule coolant leak that I can not locate.

anyone help this poorboy out?