Guage says no oil pressure after the jeep warms up. Any ideas?

 

4.0 HO. 87 Cherokee Pioneer.

 

Bad oil pressure sending unit. But, before replacing it verify your oil pressure with a mechanical pressure gauge.

 

1st,confirm with mechanical gauge or replace sending unit. Mine does the same (verified 4psi with mechanical gauge). It used to annoy the heck out of me until I finally decided to quit worrying and just drive it. That was a year and many miles ago....the 4.0 is a strange motor.

 

the sending unit is by the filter. a plug with one wire going to it

 

It just did it the other night. It was weird as all else. The exhaust sounded like the header was just unhooked from the block and then when it stopped my oil pressure guage read zero. The weirdest thing is it shows twenty to twenty five pounds until it warms up. Then it drops to zero.

 

oil pump

 

yup time to drop the pan. sorry to here. nothing ever works out as easy as a bad sending unit or gauge.

 

It runs fine though. Which is why I'm thinking only the sending unit being fouled out. I haven't had a chance to look.

 

Screw a mechanical gauge on there to see what you really have.