1995 jeep cherokee xj obd1. Have replaced every sensors under the hood including the ecu and the tcm.. it still wants to un in limp mode. Fuel pressure is perfect and holds for awhile after shut off

 

Did you use original Mopar Sensor, when replacing every sensor under the hood? It's possible you fixed something, only to have it fail, because the cheap sensor isn't in specifications.

What exactly is "limp mode?"
- poor performance?

What did your fuel pressure spec out at?
- KOEO?
- idle?
- driving / under load?
- what's fuel pressure with the engine off for 30 minutes, after priming the system?

Have you pulled the oxygen sensor out of the exhaust to see if the cataltic converter is plugged?

Do you have a rough idle?

Have you flow tested your fuel injectors?
How do your spark plugs look?
Hows the ignition system?
- spark plug wires?
- distributor cap?
- ignition rotor?

 

 

The pressure stays right at 35psi when turned off..it has no cat. Only thing i did find yesterday was a broken o2 wire. It runs rich with no power wont rev above 3500rpm and backfires thru the exhaust

 

What is fuel pressure while running? Needs to be more than 35 psi.

Look real closely at the MAP sensor hose to intake manifold.

 

The funny thing is a week ago i could let it get up to operating temp and shut off and it would run out of limp mode and run like a champ