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Unread 06-18-2013, 05:14 PM   #1
Haleyrz
Registered User
1998 ZJ 
 
Join Date: Oct 2008
Location: Spokane, WA
Posts: 2,733
So I'm on my lunch break at work, and was going through a drive thru waiting in line, and I looked at my oil pressure gauge, and it was sitting a hair under 40 psi as it usually does as the engine is warming up. It usually sits at 32psi after its warm. Anyways, I noticed it drop to around 32, then go up and back down. Nothing erratic like if it were a malfunctioning BCM, more steady like if you were to press the gas. But I wasn't, I was idling the whole time. It did it a couple times. Should I be concerned? Maybe I've never witnessed the pressure drop while idling. Most the time I'm moving. Right now it's holding steady at 32 psi idling in the parking lot. Specs are 98 4.0, 215,500 miles. Running new Bosch filter and mobil 1 10w-30. Oil and filter have maybe 800 miles on them.

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1998 ZJ Laredo, 4.0L, 2WD "Band Van", Current
1997 XJ, 4.0L, 30x9.50 Maxxis Bighorns, super 44, Sold
2003 WJ Overland, 4.7L HO V8, 6000K HID's, Sold
1996 ZJ Laredo, 5.2L V8, 3" Kolak exhaust, K&N FIPK, 4300K HID's, Sold

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Unread 06-18-2013, 05:44 PM   #2
Oldfrog
Web Wheeler
1997 ZJ 
 
Join Date: Feb 2008
Location: Louisiana/Texas
Posts: 4,032
Might be a bad oil pressure sensor....but I dont know.
Mine does that once in a while too. I dont get nervous until it drops below 25....which it never does.
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Unread 06-18-2013, 08:10 PM   #3
dnuccio
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1995 ZJ 
 
Join Date: Jul 2012
Location: Phoenix, AZ
Posts: 3,484
could be a bad pressure sender.
ive read that if you have 1 psi of oil pressure for every 100 rpm youre in good shape
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Unread 06-18-2013, 11:24 PM   #4
Haleyrz
Registered User
1998 ZJ 
 
Join Date: Oct 2008
Location: Spokane, WA
Posts: 2,733
Meh, I won't worry about it then. There's no lights on, the jeeps runs great. Makes a little lifter noise, but what 4.0 doesn't haha
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1998 ZJ Laredo, 4.0L, 2WD "Band Van", Current
1997 XJ, 4.0L, 30x9.50 Maxxis Bighorns, super 44, Sold
2003 WJ Overland, 4.7L HO V8, 6000K HID's, Sold
1996 ZJ Laredo, 5.2L V8, 3" Kolak exhaust, K&N FIPK, 4300K HID's, Sold

http://www.facebook.com/home.php#/pr...27&ref=profile
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