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Old 07-13-2005, 09:18 AM
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Oil pressure problem

I have a 96 Jeep Laredo with a 6 cylinder inline. When I am driving down the road normal speed I have about 70PSI oil pressure, but when I brake the oil pressure drops to zero and the warning light and audible alarm will sound and then the oil pressure will rise to 20PSI at idle. This all happens pretty quickly.

I think the oil pressure sending unit is the problem, but I am not sure. It is full of oil.

Does anyone have any ideas?

Thanks

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Old 07-13-2005, 09:28 AM
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engine

How many miles on the engine....

If you brake slowley does it still happen????Or only with sharp braking???

Keith
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Old 07-13-2005, 09:31 AM
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i can tell you to check the wiring.
i dont know about computerized stuff 2 much but if you cant figure it out put a "T" on it and put a mechanical gage on it ...if there is room

i would check the plug
then replace the unit maybe some one else can tell you how 2 check the unit

good luck

sr66
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Old 07-13-2005, 09:43 AM
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It is possible to stop slow enough that it will not do it, but you have to almost crawl to a stop
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Old 07-13-2005, 09:50 AM
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oil

Ok,,, well do the basics first check the gauge and sender.

Does this car have a tach in it??? I was wondering if the rpm is falling off during braking???

Keith
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Old 07-13-2005, 10:20 AM
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Jeep dash oil indicator

I seem to remember from my DCX days that the oil indicator on the dash is a switch not a gage. It is driven off of the JTEC (PCM) and is fed a "yes" or "no" signal.
I would put a real pressure gage on it and verify the readings.
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Old 07-13-2005, 10:49 AM
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I once had athe same problem on my SB Z28. The oil pump pickup came off the pump and when I'd brake the oil was forced forward and the pump couldn't pump it. It was the factory pump so the pickup wasn't welded to the pump. You'd have to pull the pan to find out.
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Old 07-13-2005, 12:09 PM
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I agree, I think there's a chance you're not getting oil at the pickup in your sump when you brake.

what's your oil level like? you could try running an extra quart or two right before an oil change and see if it affects the problem.... i.e. if your pickup has fallen off, the extra oil might prevent the pump from sucking air during braking, and you have a pretty good idea you need to pull the pan off to fix the situation.

good luck

the blonde weasel
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