Help with oil pressure please.

Normally that means the sender has gone bad or is just plain leaking. It is located near the filter.

Mike

But to be sure go to your local auto parts store and get a real mechanical oil pressure gauge. Many will lend or rent tools.

Loose connection or failing pressure sender.

Thanks to everyone. I will try a new sender. The pressure reads normal when the engine is cold and just a little low at 1000+rpm when hot. could the pressure relief valve be stuck open? If so where is it?

- Allen

More than likely is is the sender, they are notorious for failure. But you should double check using a mechanical gauge you can borrow from your local Auto-Zone.

When you get a replacement make sure it is a sender, not a switch for an idiot light.

bushman proclaimed:

It could be, but first just change the sender. I think Jeep got the original units from Lucas or similar. If your sender filter layout is the same as a 4.0 ZJ, the hardest part is simply turning the thing--you only get a very very short stroke with a wrench on each attempt. The change itself other than that is trivially simple. [Thanks DougW]

Allen,

Did the new sensor fix your problem?

Carl

Jeep Talk is what I need. I just found this string and joined. I've got a 99 4.0 with bouncing oil pressure gauge and "check gauges" light popping on & off. I think it's sending unit as engine runs fine with no noises. Just where is the thing located? And can I replace it just by crawling under it?

Thx

Carl wrote:

Jumping around would imply a loose connection to me. It is located beside the oil filter.

Mike

New sensor: Advanced Discount Autoparts $53, AutoZone $39. I'll try to acquire a mechanical gauge to screw in and see what it reads. Any online recommendations?

- Allen

Open the hood it's just behind your distributor. Unplug unscrew put new one on plug it in and you're done.