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Oil Pressure sending unit

Old 06-13-2011, 11:24 AM
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Default Oil Pressure sending unit

When an oil pressure sending unit goes bad is it possible to get erratic pressures? My oil pressure drops to zero when hot and at idle. I can rev the engine and the pressure comes up some. It's been like this for the last 2000 miles and the engine is still smooth with no knocks.
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Old 06-13-2011, 11:37 AM
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theres a good chance it the sending unit... swap it out for a new one (usually between 25 and 40 bucks) and if your oil pressure is still acting weird like that get back to us.
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Old 06-13-2011, 11:50 AM
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Sending unit is like $15 and is probably the problem. BUT it would be a good idea to test the oil pressure when you change the sender.....
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Old 06-13-2011, 04:58 PM
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You can either check it with a "mechanical" oil pressure gauge (some parts stores rent them) or you can just take a chance and replace the sending unit.

I buy the oil pressure sending units from Jeep. Way too many issues with some (not all) aftermarket oil pressure sending units. Well worth the extra money.
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Old 07-04-2011, 08:38 PM
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Anyone have a picture of where to find this sending unit on my engine? 2000 4.0 I6.
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Old 07-05-2011, 05:42 AM
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Originally Posted by SirPwn4g3 View Post
Anyone have a picture of where to find this sending unit on my engine? 2000 4.0 I6.
Directly above your oil filter.
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Old 07-05-2011, 06:06 AM
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Originally Posted by tjwalker View Post
Directly above your oil filter.
I generally unplug mine when changing the oil so as to not snap it off when trying to get the oil filter off/on.
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Old 07-05-2011, 09:50 AM
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I hope your issue is the sending unit.

My 2000 cherokee did the same thing. low to NO oil pressure at idle when warm. The lack of oil pressure was a result of worn out crank and rod bearings. My head (a 0331 head) cracked, like soooo many 2000's did, and small amounts of coolant kept getting into the oil. Coolant=sand. Sand=bad bearings. $1000 later and I'm back in the good.
($1000 was for new head from Clearwater cylinder, oil pump, water pump, thermostat, various gaskets, and the new bearings. Oh, and I bought myself a new torque wrench )
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Old 07-19-2011, 04:21 PM
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Well naturally I just busted my OP sending unit removing the filter...Wish I would have read the earlier post before I did the work...Any ideas how to replace the thing, since it is broke off flush.
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