Check Engine Light+Fluctuating Oil Pressure+Trickling Noise -
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post #1 of 4 Old 11-02-2012, 07:38 PM Thread Starter
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1997 ZJ 
Join Date: Aug 2012
Location: Medford
Posts: 22
Check Engine Light+Fluctuating Oil Pressure+Trickling Noise

Today at a stoplight as I was sitting there in my 1997 Grand Cherokee ZJ the Check Engine light came on, and I looked at all of the gauges and everything seemed normal, oil was at 40psi or so; later on, I noticed that during idle the oil pressure would drop to about 30psi and then go up to around 40psi when I started moving again...when I got home I got out of the car and I noticed a trickling noise coming from the engine area, but I didn't see any leaks underneath. Does anybody know what the problem might be?

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post #2 of 4 Old 11-02-2012, 08:20 PM
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1998 ZJ 
Join Date: Apr 2012
Location: Whitby
Posts: 342
This sounds like a dumb question, but have you checked your oil level?

I went somewhere to get an oil change done right after my Jeep had overheated one day, and later on I noticed my oil pressure was jumping all over the place. Since I just had an oil change done, I didn't bother checking the level and just assumed the sender unit was going bad. Then my Jeep started sounding a bit strange over the next couple days... Turns out those bastards put very little (if any) oil back in the Jeep. It didn't leak oil either, so it was definitely their error. I was so pissed...

So yeah, check your oil level first

1998 Grand Cherokee 5.9 Limited. ~356,000 kms
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post #3 of 4 Old 11-02-2012, 09:02 PM
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1995 ZJ 
Join Date: Dec 2008
Location: Stephenville Texas 76401
Posts: 1,042
... I too was going to ask does it have oil in it. I did that years ago .. on a chevy truck . gauge got to bouncing back and fourth . It only need about 4 qts .
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post #4 of 4 Old 11-04-2012, 08:28 PM Thread Starter
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1997 ZJ 
Join Date: Aug 2012
Location: Medford
Posts: 22
Thank you all for your replies! Turns out that the engine light was due to a bad oxygen sensor of all things, and that the oil gauge bouncing was due to the oil heating up as it went through the engine...the oil is all topped off so it's good to know that my ZJ doesn't have any expensive issues
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check engine , dripping , grand cherokee zj , idle , oil pressure

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