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Unread 10-25-2011, 08:07 AM   #1
hotwheels01
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2002 TJ Wrangler 
 
Join Date: Sep 2011
Location: cape girardeau, missouri
Posts: 41
jeep dont run right

oil pressure is 0 at idle but when i start drivin t will go up to around 25 or 30 any body kno what that means

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Unread 10-25-2011, 08:23 AM   #2
wwch99tj
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1999 TJ Wrangler 
 
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Location: Felton, Delaware
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Could just be the oil pressure sensor bad

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Unread 10-25-2011, 08:54 AM   #3
DKenyon28
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2002 TJ Wrangler 
 
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I'm sure that you change your oil regularly so this probably won't help you but I thought I'd share. I've seen some people who constantly run their vehicles with the oil being low and showing low pressure. Whenever it is under acceleration the pressure will rise. Like I said this probably isn't the problem but I thought I'd throw it out there.
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Unread 10-25-2011, 09:33 AM   #4
Bryon
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my Jeep has been like that since day one...(1998,bought it with 75 miles on it)....On low idle/rpms it'd be near zero, rev it up will shoot to 40+.....I change the oil every spring and fall, 64K on it now....I just figured it was the nature of the gauge.
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Unread 10-25-2011, 10:04 AM   #5
hotwheels01
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Location: cape girardeau, missouri
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mine would stay at 30 but i let it warm up 1 mornin and it did tht so is there any chance i could lock it up blow it up or f*ck it up the oil is full
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Unread 10-25-2011, 10:08 AM   #6
ytowntj
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Location: Norfolk - Old Dominion, Va
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Per FSM the minimum oil pressure at hot idle is 13 psi. Mine is around 25psi at hot idle and 50 under load - with 180k on it.

Does it knock when the pressure drops? Try putting a mechanical gauge on it to verify its not just the sending unit. You should be seeing over 35psi under load, preferably more like 45.
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Unread 10-25-2011, 10:12 AM   #7
ytowntj
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Quote:
I'm sure that you change your oil regularly so this probably won't help you but I thought I'd share. I've seen some people who constantly run their vehicles with the oil being low and showing low pressure. Whenever it is under acceleration the pressure will rise. Like I said this probably isn't the problem but I thought I'd throw it out there.
What are you trying to conveyconfused:

All vehicle's oil pressure rises in relation to rpm. The oil pump is driven by the distributor or opda depending on year. Both are connected to the cam via gear mesh. In newer vehicles the oil pressure gauge is a dummy gauge and doesnt show true pressure, just high and low.
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Unread 10-25-2011, 10:22 AM   #8
bardb
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Location: Prosper, TX
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Mine recently started doing this. Everything was fine at cold startup but the pressure would steadily drop after it warmed up. Ordered a replacement oil pressure sensor from Rock Auto and had it in my hand two days later. Once I figured out how to get the wiring connector off (red part slides btw) it's as easy of a replacement as you could ask for. A little teflon tape to the threads, a shot of carb cleaner in the wiring connector to flush the oil out of it and a dab of dielectric grease to relube the connector and I'm back to 40+ psi.
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Unread 10-25-2011, 10:57 AM   #9
hotwheels01
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Location: cape girardeau, missouri
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how do i install a mechanical gauge
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