deceiver

Got a 1990 mustang ECU (a9p) / harness in my 95 F150. Ran fine for a year after the swap. I recently had some down time with it (3 months) to install a new transmission / control module and a full lightning suspension. Problems started after the downtime.

It runs so rich that it will not start unless the tbody is cracked open a good 3 turns, hunts for idle and stalls after that. of course I can drive it power brakeing and runs good, just lacks power for obvious reasons.

Here is a list of non stock parts on the motor:
RPM heads
270/270 cam
#30 injectors
75mm MAF / t-body
performer 5.0 intake
EGR delete
351w bottom end
165 degree tstat
heavy duty clutch fan
2 core radiator

Checked so far:
vacuum - 15 inches on idle (once it settles down enough)
Fuel pressure regulator
ACT
ECT - changed
MAP
MAF
Cap / rotor / plugs (it was over due and the plugs were fouled black)
TPS

At a loss as to what to check next, if you tell me to revisit something I will, because I must have missed something.

5.0stang123

Your thermostat is too low stock is 192 F

deceiver

I was having problems with overheating last summer, 192 was too close to the hot side of the gauge.

I plan on putting in a 180 now that I have a good cooling system that can keep up.

I know that the 165 tstat will cause it to run a little rich, this problem happens as soon as I crank the motor, so it should be unrelated.

mattdel

You probably just need a tune. #1 you dont have enough motor to justify 30lb injectors, im surprised you said it used to run good.

mjr46

maybe so but not gonna cause his issue......................OP what control module did you install?? and what prompted this mod???

deceiver

I blew up the AOD over drive and trashed the stock converter with my super powerful engine

becontrols TCS 4r70w edge converter.. lots of time and money and now it's poop..

Bubba 95SN

Low as you can go is 180* or will be rich.

deceiver

I understand that, as posted previously, but the engine is not getting to 70 degrees much less 160 before having problems.

deceiver

This problem is solved, had voltage backfeeding from the controller into pin 7 instead of pin 26 on the ecu.

Timspony

^^ Cool ... I was going to ask you what your fuel pressure is/was!?