Pulled Codes, Replaced Sensors, Need Help...

[afast93stang]

Im not sure what else to do at this point.

I parked my car on a Friday evening and it was running just fine. I didn't drive for 2 days, when i started it up it idles and runs like crap. No power at all. The engine is an 89 5.0, body is a 93. It has 230k + miles on it.

I pulled the codes and got:

22 - MAP (vacuum) or BARO signal out of range -
So I replace it.


35 - EVP - Engine RPM's too low to test EGR system - EVP
Not sure what to do...


51 - Engine Coolant Temperature (ECT) sensor signal is/was too high - ECT
So I replace it (the one on the heater core lines)


53 - Throttle Position sensor too high - TPS
So I replace it.

After replacing those sensors it progressively got better but it still in the low RPMs it struggles or studders. Ive also checked the timing which is set to 10*. Ive used different kinds of gas thinking it could be that.


Some days it runs rougher than others, in the morning when its cool it runs fine like normal for about 5 minutes and then starts running rough. Especially in the lower RPMs.

I also recently changed the fuel filter, spark plugs, spark plug wires, cap and rotor. Ive checked for vaccum leaks and I cant find any...

Whats next?

 

[jrichker]

The C&L & Mac Fenderwell Cold Air Intake are a possible mismatch. Put the stock airbox and filter back on and see if your problem goes away.

 

[afast93stang]

Ill check those out to see if they are loose but they have been on the car for the past 2 years without issue. Ive never had the factory airbox...

 

[93 LX]

vacuum leak?

 

[HISSIN50]

Any issues with the wiring for EEC Pin 46?

 

[Foxfan88]

you can try taking a digital voltmeter and probing the green and black wires on the TPS and loosen the screws and turn the key on and try to rotate the TPS to get a voltage aroudn 1v at closed throttle and make sure it goes over 4v at WOT