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Old 03-31-2013, 01:03 PM   #1
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Oil Pressure Sending Unit HELP!!!

Within the past week I've noticed my oil pressure reading close to 80. It's always fluctuated but I've never seen it this high. From my understanding, this could be the sign of my oil pressure sending unit going bad and its a common problem on these 4.0 engines. I've also read that to test the theory, I can turn the key to the on position without starting it, and if it shows anything above zero, I in fact have a bad sending unit. How accurate is that test? Because I in fact read above 40 when the key is just in the on position. I'm hoping its the unit and not something major so before I buy a new unit I wanted to make sure that mine is in fact going bad.

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Old 03-31-2013, 01:17 PM   #2
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Time for a new sending unit… if the engine is not running, it can't drive the oil pump to develop any pressure.

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Old 03-31-2013, 01:37 PM   #3
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Buy one from the dealer, after market electrical parts are not usually very good quality (China)
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Old 03-31-2013, 02:26 PM   #4
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That's good to hear. I kinda assumed but it was making me a but nervous also. I let it sit for about 5 hours at work and cool down and just went out on my lunch break and turned the key to the on position and it raised to 60 psi without the motor ever being turned on. Any suggestions on where to pick one up at? Best price?
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Old 03-31-2013, 02:50 PM   #5
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That's good to know about it reading with the engine off. I have suspected mine was bad because of odd readings for a while and that confirms it. Pops right up to 40 in the on position. I found a Mopar one for my 02 for about $50 on line but I haven't pulled he trigger on it. Was hoping someone here could suggest the cheapest site.
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Old 03-31-2013, 03:16 PM   #6
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Stay away from cheap, cheap means china and you get what you pay for. Go to the dealer and ask for a discount, they will usually agree to something.
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Old 03-31-2013, 05:34 PM   #7
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Or you could go to an auto parts store and grab one for much cheaper than that. I replaced mine last year with one from advance auto parts and have had no issues. I hate to break it to you, but even an American made electronic part is very likely going to use Chinese circuitry. Unless you honestly believe that Chrysler is not outsourcing their electrical components, in which case, I have a bridge I'm looking to sell.
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Old 03-31-2013, 05:46 PM   #8
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That was a bit ruder than I meant it to be, sorry about that. I agree with you on cheap Chinese junk, especially if we're talking about steel, but realistically you're paying for the mopar stamp by buying from the dealer. The electronic components underneath are likely exactly the same, no matter which brand you get.
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Old 03-31-2013, 05:50 PM   #9
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Quote:
Originally Posted by Some Farkin Guy View Post
I hate to break it to you, but even an American made electronic part is very likely going to use Chinese circuitry. Unless you honestly believe that Chrysler is not outsourcing their electrical components, in which case, I have a bridge I'm looking to sell.
Even if OEM is made in china, Chrysler probably holds them to a higher standard. Even though the Chinese are well known to refuse QA inspectors from america into their sweat shop factories.
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Old 03-31-2013, 06:03 PM   #10
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Even if OEM is made in china, Chrysler probably holds them to a higher standard. Even though the Chinese are well known to refuse QA inspectors from america into their sweat shop factories.
I was just going to say this. Bad past experiences keep me out of auto parts stores for electrical parts.
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Old 03-31-2013, 06:07 PM   #11
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a couple months ago I had to replace my oil sending unit.... Did a lot of searching online and even local auto shops. While the local auto parts store had units for just about $22.00, the local jeep dealer was selling them for about $25.00 for a mopar oem... (this was for an 04 tj)
Check you local service dept - you might be surprised...
Now replacing it was a pain trying to get a wrench up there - too cramped for my big mitts... but I got an automatic so the engine bay is a bit more cramped than those with a manual...
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Old 03-31-2013, 06:15 PM   #12
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Even if OEM is made in china, Chrysler probably holds them to a higher standard. Even though the Chinese are well known to refuse QA inspectors from america into their sweat shop factories.
Maybe they do hold them to a higher standard, maybe they don't. Either way I'm not paying twice the price for the same part with a mopar stamp on it.
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Old 03-31-2013, 06:37 PM   #13
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about $25.00 for a mopar oem
That's not too bad, actually. Someone earlier said it was $50, which is more in line with the stealership prices I'm used to seeing, and why I suggested the auto parts store. If your dealership will actually sell one to you for that price then go for it.

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