Oil pressure sending problem

[4sd911]

When I'm driving along the oil pressure will read around 60psi and then I run over a bump and the gauge will drop to zero for a second or two then return to the previous reading. what causes this? Should I be looking at the sending unit on the engine or the gauge on the dash? I know if I remove the wire from the sending unit the gauge will top out with the ignition on.

[Eagledriver]

Either the sender is going bad or the wire to the sender is grounding out somewhere. I suppose the guage could be losing power intermittantly.

-Andy

[4sd911]

OK, I see removing the wire to the sender will send the gauge to the top, ground the wire it will drop to the bottom. I'll search for a grounding problem first.

[JJ 911SC]

Originally Posted by 4sd911

OK, I see removing the wire to the sender will send the gauge to the top, ground the wire it will drop to the bottom. I'll search for a grounding problem first.

Yes that mean your gauge is OK and more than likely the connector is too loose in the post.

I had to crush the connector a bit to get a tight fit and the sporadic up and down stoped