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Old 11-14-2013, 06:07 AM   #1
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Oil gauge drops to 0 at idle HELP!!

Need some help guys, I have a new 2.4L engine on my 2003 TJ. Thew motor was brand new when I put I had it put in. I now have 7000 miles on it. Driving to work this morning, after the engine warmed up, I noticed when I stopped or let off the gas that the oil pressure would dropped to 0 and check gauges light would come on. I replaced the oil 3 weeks ago with Mobil1 synthetic 10w30 and a new bosch oil filter. Any ideas about whats going on? Any help would be greatly appreciated!!
Thanks

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Old 11-14-2013, 06:19 AM   #2
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A common problem when changing oil is sometimes when you change the filter the oil pressure sending unit gets damaged just based on it location (right next to oil filter) Im thinking that's your problem. However do all appropriate test first.

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Old 11-14-2013, 06:19 AM   #3
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Oil pressure sending unit although at idle your oil pressure will drop. Next time it does it just give it gas it should move up. Mine does it also until it builds enough pressure to move the needle
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Old 11-14-2013, 07:29 AM   #4
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I will replace the sending unit and see if that fixes the issue. I did make sure, when changing the oil, to avoid the sending unit.
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Old 11-14-2013, 07:37 AM   #5
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They do go bad but before buying a new one check the connector itself. Unplug it and see what it looks like, if its corroded or oxided then you will get lower readings. Obviously, check the sending unit as well
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Old 11-14-2013, 07:44 AM   #6
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My oil sending unit went bad had to temp in an oil pressure gage. An oil sending unit
is 60 to 90 days out mopar does not even have one 2.5 and 4.2 take same sending unit according to mopar
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Old 11-14-2013, 08:36 AM   #7
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Would this have something to do with the face that it was much colder this morning than it has been?
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Old 11-14-2013, 09:23 AM   #8
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Quote:
Originally Posted by Chucker901 View Post
Would this have something to do with the face that it was much colder this morning than it has been?
When cold, oil is "thicker", pressure higher.

(I had a pressure problem a few years ago -- it was the sending unit)
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Old 11-14-2013, 11:49 AM   #9
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Sending unit is a super common problem and a 2 minute fix. $20 at autozone if I remember correctly. Throw some newspaper under the jeep when you swap it out because a little oil may drip out
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Old 11-14-2013, 12:30 PM   #10
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My Mustang does the same thing (drops to 0 when idling and it's cold out). Swapped it out a couple of years ago and it's doing the same thing, just haven't changed it out yet. You could do an oil pressure test just to make sure.
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Old 11-14-2013, 12:56 PM   #11
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I had the same problem with my Jeep. They just clog up over time. Installed a new one and it was fine forever afterwards. Just make sure you get the right OPS unit from autozone. It takes about ten minutes to change, if that.
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Old 11-14-2013, 09:59 PM   #12
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Pressure hasn't dropped since this morning. I'm going to get a mechanical gauge from autozone and check and make sure it's not the oil pump. Also will be changing sending unit. Thanks for the help guys!!
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Old 11-14-2013, 10:39 PM   #13
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Don't bother installing a mechanical gauge until after you determine that replacing the sender didn't fix the problem. And with plenty of bad experiences with AutoZone oil pressure senders, I'd only go with a Mopar sender.
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Old 11-15-2013, 05:44 AM   #14
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Don't bother installing a mechanical gauge until after you determine that replacing the sender didn't fix the problem. And with plenty of bad experiences with AutoZone oil pressure senders, I'd only go with a Mopar sender.

This is a big +1 on the Mopar unit. The box stores only lasted about 3 days. The Mopar lasted a year before I started getting the fluctuations.
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Old 11-15-2013, 06:00 AM   #15
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I'll go ahead and add that while I agree on the Mopar unit, I had a Mopar unit go out on me in less than a week. They replaced it of course and I had no issues with the replacement, but they can be faulty too is all I'm saying. I was a little disappointed that it was made in Mexico, but that's better than China.
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Old 11-15-2013, 05:30 PM   #16
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I called the dealership and am waiting for the mopar gauge. I also had to order a sending unit from the dealer as well
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Old 11-15-2013, 09:55 PM   #17
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I've had my Autozone OPS for six months and it performs great. They did tell me that there were two different types. And, they came out to find exactly which type I had.
Nice guys. Of course, they loved my Jeep. But, who doesn't love our Jeeps.

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