The users manual stats that the oil pressure at idle should be 13 lbs minimum and between 40-60 at hiway speeds
A 1998 Jeep Cherokee does not have a mass airflow sensor. It uses a manifold pressure sensor, MAP, which is on the rear of the intake manifold.
A 1998 Jeep Cherokee has disc brakes in the front.
A 1998 Jeep Cherokee uses R134a.
Have a shop check the AC system pressure
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my jeep Cherokee 1998 4.0 is a straight 6
A 1998 Jeep Grand Cherokee has a four speed automatic transmission.
I think they are also refering to a fuel pressure regulator but not sure.
Have a AC shop test the AC system pressure
A 1998 Jeep uses R134a.
The correct factory tire size for a 1998 Jeep Cherokee is 215/75 R15.
Normal idle oil pressure would be around 30 psi. Minimum pressure should be about 10 psi.