Oil Temp Pegged at start

[Daver22]

87 Targa 3.2 G50. When I started it for first time this spring, my oil temp gauge is pegged at the top (in the orange). Been searching on-line, found where gauge isn't working at all, but haven't seen where pegged from start up. Let it run about 10 mins, restart no change. Pulled wire from sending unit, cleaned it, put it back on and same issue.

Guessing ordering a new sending unit is best option, but thought I would see if anyone else had other thoughts??

Thanks

[porschyard]

Ground the wire at the temp sender and turn the key to the on position. If gauge and wiring are working correctly the needle should drop down to the lowest point which would indicate a bad sender.

You did not say if the needle is pegged all the time or only pegs when turning the key on but Sometimes when the needle pegs it can stick and after grounding the wire at the temp sender give the gauge face a light thump to see if it drops back down.
I would be leaning to some other issue than the the sender such as wiring continuity and can’t honestly remember ever having a oil temp sender with an open circuit.

Richard

[jbell959]

Originally Posted by porschyard

Ground the wire at the temp sender and turn the key to the on position. If gauge and wiring are working correctly the needle should drop down to the lowest point which would indicate a bad sender.

You did not say if the needle is pegged all the time or only pegs when turning the key on but Sometimes when the needle pegs it can stick and after grounding the wire at the temp sender give the gauge face a light thump to see if it drops back down.
I would be leaning to some other issue than the the sender such as wiring continuity and can’t honestly remember ever having a oil temp sender with an open circuit.

Richard

That is the correct procedure for the pressure gauge. The temp gauge is the opposite. If you disconnect the sender wire from the G connector on the back of the gauge, it should either not move or just move a tiny bit when you turn the key on. Then if you touch the G connector to ground it should peg the needle to the top. If either of those tests fail then the gauge is bad. If those tests pass then do the same thing at the sender. Disconnect the wire from the sender and the gauge should sit at the bottom, then touch that wire to ground and the gauge should peg

[Daver22]

Got it, will give it a try. thanks guys.