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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

89 Plymouth Voyager, High Oil Pressure
Q: What exactly does a high oil pressure reading mean? I have an ‘89 Voyager with 70K+ miles that runs well, but the oil pressure runs rather high while driving, at an idle it drops back down to an average rate.

A: Inside your vehicle’s engine is an oil pump which is connected to a maze of passages that direct oil to every critical point. Critical point meaning where lubrication by oil is needed. The oil pump is mechanically driven, so as the engine turns the oil pump, it pumps oil. For the oil pump to move oil it has to build some sort of pressure to do so. The result of this pressure is referred to as oil pressure. There is good oil pressure and there is bad oil pressure. Bad oil pressure can come two ways. Low oil pressure, resulting in lack of enough oil getting to the critical points. Then there is high oil pressure, which does things like blowing the oil filter off, which results in low oil pressure and once again lack of oil to critical points. I truly doubt that your Voyager is suffering from dangerous high oil pressure. It’s likely that the pressure sensor on the engine is lying and the gauge on the dash has joined in on the scheme. To be sure, have your technician install a mechanical type oil pressure gauge and compare the pressure readings to that of the gauge on the dash. The fix will likely be a new oil pressure sensor.

 
     
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