Just changed my oil and now the guage is on 0 and wont even go up when moved. Its a 98 cherokee with 161k. the guage usually reads 15 psi at idle and 40 going down the road. check guage light is on but not check engine. any ideas?

 

did you put enough oil in it?
Did you maybe bump or disconnect the pressure sending unit while changing the filter?

 

how close is that to the filter? what does it look like?

 

right above it, looks like this...
http://www.4wd.com/productdetails.as...mpaign=product

 

It is ez to do I did it on my 98 the first time I changed the oil in it

 

Yea that's a common problem. Spray it with contact cleaner or WD-40 and plug it back in...Tj

 

if you grab a hold of the plastic part of the sending unit, see if you can wiggle it. If it is loose, the plastic broke away from the metal and you need to replace it. Very easy to fix.

 

that was it... cant get the damn thing to plug back in though haha. least i know what it is now... thanks for the info guys

 

when mine went it shot oil out of the little hole that didnt have the wire coming out of it not sure if thats a common thing but definatley scared me that it was something worse

 

Sorry to hijack but my oil pressure stays pegged at 80psi and drops down to 45psi when it's warmed up and sitting at a stop light. As soon as I take off it goes right back up to 80psi. When I put the key in and turn it forward the gauge goes up to 40psi without the jeep on. Is this a symptom of a faulty oil pressure sending unit? Again, sorry to hijack. I just didn't want to start another thread.

 

yes, this is possible faulty pressure sending unit
what oil do you use?

 

Valvoline 10w40. I just replace the oil pressure sending unit and now it reads 40psi at idle and 50-55 while driving. Another question. Is $46 too much for the unit? It's a duralast with lifetime warranty.

 

$46 is average.
try runnin 5w30, 10w30 at least.
manual calls for 5w30...

 

Will do. Thanks for the reply and again, sorry for the hijack. Any particular brand you are partial to?

 

I run Valvoline, but oil is oil. Castrol, Valvoline, Penzoil, they all break down at the same rate and do the same thing.
Synthetics I run Mobil 1 or Royal Purple