Oil Pressure Problems
08-19-2017, 11:13 AM
#1
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Model: Cherokee
Oil Pressure Problems
Hi guys, I have a 1993 xj and whenever it warms up, the oil pressure dips down to near 0 at idle. Once I accelerate is goes back to around 40. I read it could be the oil pressure sending unit but I replaced that and still have the problem. It also isn't passing smog so could the oil pressure problem have anything to do with that? Thanks, anything helps.
08-19-2017, 12:08 PM
#2
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Location: central IN
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Year: 1997
Engine: 4.0
oil pressure won't affect smog. you need to verify pressure with a mechanical gauge, remove oil pressure sending unit and put a mech gauge place in its place.
08-19-2017, 12:39 PM
#3
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Year: 1997
Model: Cherokee
Engine: 4.0L
Not sure on the oil pressure, but failed smog could be an O2 sensor, or a vacuum leak, or it just needs a tuneup, or a combination. Never hurts to check the fuel pressure.
08-19-2017, 05:21 PM
#4
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Year: 1998 Classic (I'll get it running soon....) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0
Yep. I got a Bosch for $16 on sale. Took me all of ten minutes to:
- Remove stock sending unit.
- Connect Bosch.
- Set Bosch gauge on cowl in front of windshield.
- Get in.
- Start engine.
- Read Bosch.
- Shut off engine.
- Get out.
- Remove Bosch.
- Replace stock sending unit.
That confirmed that I had good oil pressure. No worries. Then I got a new sender, and all is well.