why does my oil pressure gauge drop

1994 FORD E-SERIES VAN
155,000 MILES
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MIKE3D
  • MEMBER
  • 5 POSTS
some time needle drops some time goes back to is original position i see that needle go up when i turn heater on.when i star the truck it take is position near center of gauge an some time juste pass quater of gauge.
May 14, 2012 at 7:22 PM
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DRCRANKNWRENCH
  • ✓Experienced Mechanic
  • 3,380 POSTS
It sounds like you have a grounding problem in the dash. look for grounds, of course they will be black wires going to a clean metal connection, and check them for a clean tight corrosion free fit. In the mean time you might want to go to an Advance Auto or Auto Zone and borrow, they lend out free tools, a oil test pressure gauge to make sure your pressure is okay. The sensor may be bad but from you describe with the switch changing it it is probably a shared or co-located ground between the motor and the gauge and/or switch.
May 14, 2012 at 7:27 PM
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