Oil pressure problem

[lowkey]

I have a 99 cherokee with a 4.0 and auto trans with just over 60k (very regular oil changes). Last night leaving work I look at my cluster to see the oil pressure guage pegged on 80psi. I was doing about 55 in overdrive at about 2200RPM. I pulled over and at idle I was still at like 65psi. First time I have ever seen this. After I drove it home (had no choice) the running pressure went down to about 70 psi and idle was about 40-45. Any one have any ideas? I am hopping it is just the sender and not a blockage.

 

[scottmcneal]

check the wires to make sure there good. If they are then get a new sender

 

[90Blue_XJ]

check the wires to make sure there good. If they are then get a new sender

That would be my thoughts as well. Put a mechanical guage where the sending unit is threaded to see if those readings were false. Then go from there.

 

[lowkey]

Thanks guys will try that on thursday.

Have you all ever heard of this before on one of theses engines.

I have a total of 5 XJ's in the family and mine has the least amount of miles and abuse and i have had the most amount of problems with it. (some my fault, tree)

 

[scottmcneal]

off road it more... lol

 

[lowkey]

off road it more... lol


I hear that.

 

[90Blue_XJ]

Thanks guys will try that on thursday.

Have you all ever heard of this before on one of theses engines.

I have a total of 5 XJ's in the family and mine has the least amount of miles and abuse and i have had the most amount of problems with it. (some my fault, tree)

In fact I have heard of that before but I can;t remember the cause. I thought it was on another forum and I checked(searched) all of them without any luck. Not sure but I think it was a bad ground or a wire grounded out.
BTW do not put any teflon tape on the threads of the sending unit when you re-install it because it gets its ground through those threads and teflon tape is an insulator.

 

[lowkey]

Thanks

 

[AlohaBra]

I have a 99 cherokee with a 4.0 and auto trans with just over 60k (very regular oil changes). Last night leaving work I look at my cluster to see the oil pressure guage pegged on 80psi. I was doing about 55 in overdrive at about 2200RPM. I pulled over and at idle I was still at like 65psi. First time I have ever seen this. After I drove it home (had no choice) the running pressure went down to about 70 psi and idle was about 40-45. Any one have any ideas? I am hopping it is just the sender and not a blockage.

The sender goes bad,

Take the connector off and clean the contacts with brakekleen.

You will have to replace it eventually.

It cost about $50.00.