General question- GM and Ford


Old 12-06-02, 02:25 PM
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General question- GM and Ford

Not a problem question. I have a couple of Ford vehicles and have a couple of GM Vans. Just wondering why it is that the GM's oil pressure fluctuates depending on RPM and on the Fords it stays the same no matter what the RPM. Im going off what the guages read.

Last edited by fuller911; 12-06-02 at 03:55 PM.
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Old 12-07-02, 12:20 AM
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GM gauges read actual oil pressure. The value displayed on the instrument panel isn't necessarily accurate, but it is representative of the actual engine oil pressure.

Many, but certainly not ALL Ford oil pressure gauges are idiot lights in disguise. They'll display 'normal' oil pressure as long as the engine oil pressure stays above 5-8 psi.
Old 12-07-02, 05:58 AM
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Ford issued a bulletin about this a while ago and I believe added a resistor to the circuit.

This is why when an oil pressure problem is suspected, a hand held gauge (not the dash one) must be used to confirm/deny that issue.
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