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Cherokee srt8, oil pressure t 99psi days then 0 psi.

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Cherokee srt8, oil pressure...

Cherokee srt8, oil pressure hit 99psi for two days then 0 psi. Installed new sensor on oil filter adapter and read 64 psi when I crunk her up last night. This morning she wouldn't start, after removing neg cable for a couple minutes, it runs after a lengthy crank duration. Getting several codes now, bought a bosh diagnostic tool and was searching web for any extra info.

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Oil pressure read 99psi for two days, then went to 0psi. Oil temp stays consistent as does water temp. Just replaced oil pressure sensor, now she is hard to start

Submitted: 2 years ago.Category: Dodge
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Answered in 10 minutes by:
3/1/2016
Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago
Juan Crespo
Juan Crespo, ASE Certified Technician
Category: Dodge
Satisfied Customers: 1,532
Experience: A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
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What is the actual oil pressure as taken with an oil pressure tester?

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Customer reply replied 2 years ago
Yet to get that far, bought an oil gauge just to temporarily install to check pressure. Problem now is hard starting and got several codes to go through: P0335, P2122 P0642, C121C and U3FFF. These codes are from use with a Bosh brand diagnostic tool (obd)
Customer reply replied 2 years ago
I didn't disconnect the battery before unplugging and replacing the oil pressure sensor. Bet I should have, lol
Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

Well, that's the thing; we should first check the basics, then move on to the codes. By the way, beware of cheap code readers when working on these vehicles - for example U3FFF is not a recognized Jeep code, which might mean your code reader cannot correctly interpret network codes.

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Customer reply replied 2 years ago
was so sure everything was ok last night once sensor was replaced and once fired up I was getting 64 psi on the dash readout. This morning was a different story when it just cranked over without firing. All the added codes has me all messed up now. Thanx for your help Juan, going to go see about getting the mechanical gauge hooked up to get what I feel is a more accurate oil pressure.
Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

OK. Let me know when you have those oil pressure readings and we'll take it from there.

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Customer reply replied 2 years ago
Ok got mechanical gauge done and she fired up like new, wierd. Gauge has 0, 25, 50, 75, 100 psi readings with a line increments half way between each. Oil pressure reads half way between 50 & 75 psi (67.5psi?). Throttle works fine and all lights on dash are off.
Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

You need to find a way to connect that gauge inline with the OP sensor so any discrepancies can be shown and the truck can be driven - most OBD-II monitors will only execute after the engine is warm and in Close Loop. So far, all we have is that cold-engine reading of 67.5 psi or so, which really doesn't tell us much.

One more thing, trying to diagnose this truck with just a code reader is like trying to fly to the moon on the Wright brothers airplane ;-)

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Customer reply replied 2 years ago
we need operating temperatures with both gauge and sensor hooked up, got it.
Dodge Mechanic: Juan Crespo, ASE Certified Technician replied 2 years ago

That would be a good starting point. However, going from there without a dealer-level scan tool might not be possible.

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