8v running rich?

[Kylemoos1]

Hello purchased a non running 93 8v. It will start if I hold it to the floor. Will only rev up to about 1500 rpm, runs extremely rich then it dies. Every once and awhile it will start and idle perfectly for about 5 seconds before it starts to run rough misfire then stall. I’m at a loss. Swapped map sensor, ect, iat, and TPs. No change. It will flash a 44 code. Have tired multiple TPs, and tried to calibrate but apparently can’t get the procedure correct? Reading about a “backup” condition from the ecm? Fuel injector has a nice spray pattern, doesn’t seem to slobber.Compression cold is around 145. Ecm looks good internally. Any suggestions?

[fixkick]

code 44 meANS IDLE SWITCH SET WRONG (TPS NOT CALIBRATED CORRECTLY IS CAUSE)
first off 145psi at x4 ?, 150 to 170 psi is spec, cold to hot.
The IAC loves to fail this old (in the base of the Tbody TB) to see if true. use 5% throttle and crank it. this adds air so the engine can run.
barn find cars, have bad fuel, so that must not be kept in the tank, as it will clog the injector.
yes the TPS calibration is tricky on 8v the most.
that is because of that DASH pot fast idle, device on top of TB. it must be retracted to set the TPS.
14 steps, less at 10 if you skip the Go/NOGO steps.
https://fixkick.com/tps-testing#8V_Calibration

the ECU caps may be bad (dried out inside it) or just that large one in the corner (25uf at 50v?) read the side of cap, it's a $1 fix. and polarized pins, do not reverse it.
https://fixkick.com/ECU/hell/html/image_4.html
check fuel pressure at the test port on the fuel filter. , a bad FPR this old is super common.


keyon, 3 times no start 31 to 41 psi
same running, it does not vary at all like 16valve engine does
the only variance is with altitude. higher the altitude the lower the fuel pressure

[fixkick]

backup mode ECU is bad caps, mostly
engine run super super rich and floods fuel , spark plugs drip fuel ,pulled.
no new spark plugs and wire sets,? (cap /rotor)

44 is for sure TPS set wrong,. takes a DMM set to ohms to set it.

[fixkick]

THE IAC under TB is a thermal fast idle device, uses a wax pellet just like the engine coolant thermstat does.
it closed the IAC at 150f and above. when cold and open the IAC it lets in start up air and the fast cold idle air for about 1500 rpm, (more higher say in Alaska)
when it fails closed , there is way too little start up air to run the engine. (there is some but is small)