Recent content by Photojeeper

Well the culprit is/was the O2 sensor, although no codes were in the ECM and the CEL did not go on as it should have. Got a new Bosch O2 sensor. One thing I am going to change is the thermostat. I believe that when the shop got a new on for the head they went by the book. The 4.2 uses a 185...

Oh. lol

Nope, I have a new temperature sending unit and the MAP sensor and MAT sensor from NAPA also an O2 sensor.

No codes or even what values are too high or low. Do not know what CEL is.

It is a 1990 with the Mopar kit which is an Muiltport EFI. Looking at other threads and other forums, I am ruling out the fuel pump. Since if it was bad it would be cutting out and the Jeep would run out of fuel. If I let it cool it runs fine until OT. So I will be replacing the coolant temp...

1990 YJ with Mopar Fuel Injection. When the engine gets to operating temperature the starts hesitating, when I press on the throttle t gets worse then stalls. I’ve replaced the fuel pressure regulator and fuel filter. Also insulated the fuel lines to prevent vapor locking which was a problem...