Backwards oil pressure after replacing sending unit? - JeepForum.com
 
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post #1 of 11 Old 12-11-2008, 07:52 PM Thread Starter
gonzo350
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Backwards oil pressure after replacing sending unit?

2001 Grand Cherokee 4.7 After a few minutes of driving and the engine fully came up to temp my oil pressure (per the gauge) would drop to zero at idle after only a few seconds and then come back up to normal pressure once I resumed driving. Oil pressure sending unit right? Replaced the sending unit and now I have the opposite problem! Normal pressure at idle, drop to zero when driving! No strange noises, oil level is full, no leaks....no idea!? Thoughts?

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post #2 of 11 Old 12-11-2008, 08:12 PM
Kruzin
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Return the sender to where you purchased it and get a replacement.

'09 JK Rubicon
'01 XJ Sport
'10 Fusion
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post #3 of 11 Old 12-11-2008, 08:19 PM Thread Starter
gonzo350
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LOL I would, but it was the last one in stock, and of course they're closed now. Think its just a bad unit?
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post #4 of 11 Old 12-11-2008, 08:52 PM
elmer_fud
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wrong sensor

take it back, and take the old one with you or copy any numbers you can down any numbers you can find

Brian
95 ZJ, 5.2 V8,160,000 miles

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post #5 of 11 Old 01-24-2010, 11:52 AM
jeepfixer
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Same Problem

I have the same exact problem with my 01 GC Limited 4.7 Difference is I put in 2 new sending units and they don't fix the problem. I even confirmed the latest new one at NAPA with the parts guy via the computer and the book. I am now thinking it is a faulty gauge in the cluster but any other ideas prior to ripping out the dash would be helpful.
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post #6 of 11 Old 04-19-2010, 11:05 PM
tlakael13
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Hi, y'all. I was having the same problem on my 01 GC Lmt 4.7; sometimes it would to zero and then back up to normal...then, it stopped doing it for a while....a year later, it came back....two weeks ago,I replaced the unit, but it continued doing the same thing until two days ago....it now stays a zero. I checked the oil level, and it is OK. There is no weird noise, and it sounds good. How much should I tighten the unit? Maybe I over did it. I already have 191K miles on it. Do I have to take in for a rebuild? Well, thanks for this great forum and its members; it has helped me out many times. I appreciate the help and time.
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post #7 of 11 Old 04-20-2010, 01:30 AM
ratmonkey
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Stop buying parts store senders. More often then not they don't agree with jeeps. Mopar only.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #8 of 11 Old 04-20-2010, 09:09 AM
LordHobbit
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Quote:
Originally Posted by jeepfixer View Post
I even confirmed the latest new one at NAPA
That's your problem. I've never had good parts or good service or good prices at NAPA.

93 red ZJ 196k 4.0. Spent more money than I should have ...
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post #9 of 11 Old 12-17-2010, 11:02 AM
autoposer
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Having the same problem. After replacing with NAPA sending unit pressure drops to 0 with acceleration. Old one only dropped to 0 at idle every once and a while. Did anyone here have success when changing back to the Mopar brand?
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post #10 of 11 Old 12-17-2010, 03:39 PM
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Originally Posted by LordHobbit View Post
That's your problem. I've never had good parts or good service or good prices at NAPA.
x2 NAPA sucks. I've never got anything from them for any vehicle that was worth a crap.

~Aaron


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post #11 of 11 Old 12-17-2010, 03:43 PM
autoposer
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In case anyone else stumbles across this thread, I too just proved that Napa sucks. I purchased 3 oil sending units from them. One snapped off at the post and the other two caused my oil pressure to go backwards after install. I finally went and purchased a Mopar one for 300% more money but its now working great...
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