Jim Grant's Tech Tips
'99 Jeep Cherokee, Oil Pressure Problems
Q:
I have a 99 Jeep Cherokee. The oil pressure gauge reads all the
way up. When I turn the ignition on the gauge reads normal, then when
I turn the motor over the needle shoots all the way up. What do you think
the problem is??
A:
The oil pressure gauge
on your Jeep sends an electrical signal out to a pressure sensor that
is on the engine, called an oil pressure sensor. The oil pressure sensor
alters the electrical signal from the oil pressure gauge in relationship
to oil pressure. The oil pressure sensor lives a hard life with heat,
cold and vibration. It is not uncommon for the internal seal of the sensor
to fail allowing oil to enter the electrical part of the sensor. The oil
really messes things up and causes the oil pressure gauge readings to
become erratic and unreliable. In most cases the fix is a replacement
pressure sensor.
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