4.0 low oil pressure at idle - fixed - Page 5 - JeepForum.com
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post #61 of 137 Old 09-02-2012, 05:17 PM
tazinhawaii
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Originally Posted by kbhi67 View Post
Being a first time poster, just wanted to say thank you to all those who post here. I think you will save me lots of time and many cuss words. I am having this same problem in my 97 Tj 4.0 no pressure at idle and ocassionally engine alarm at start up . Look forward to trying this fix this week. Will post results.
Did it work? I'm getting the warning upon startup when hot as it takes about 5 seconds for the oil pressure gauge to increase. But I do have well over 10psi at idle. Only problem is startup. Also going to change the oil filter because a bad drainback valve could also cause this.

Derrick

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post #62 of 137 Old 01-16-2013, 05:51 PM
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Thanks qhead72, I was having this same exact problem with my 01 XJ having no oil pressure when warm. All tho running the engine out of oil at 4k RPM's may not be the best idea, it sure did fix the problem easily and quickly. Thanks again.
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post #63 of 137 Old 01-21-2013, 01:03 PM
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post #64 of 137 Old 03-24-2013, 10:25 AM
BAMF_Zj
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Hey guys, first time poster....first I want to say this is my first Jeep and I absolutely love it (Zj).... I have read almost every forum and post about this issue but no one has had my exact problem... mine was running great, good oil pressure, extremely quiet....then I decided to do an oil change... only had the rig 7-8 months (bought used)... the filter was welded on..lol... so I did the screw driver trick from under the vehicle... little did I know the oil sending unit was hovering over the filter and I went through the filter withe screw driver and snapped the sending unit off... no big deal, went to Advance Auto and got a new one...used Valvoline 10w30 and a FRAM filter(probably the problem)... so now, with fresh oil and brand new sender, I have these issues...start up is around 40-45 and then when warm... 10-20 ... while driving will go to 40-45 for a few then drop to ZERO and light comes on.... I can idle and let it drop to zero and it will stay there and sometimes revving it will bring it back up, sometimes not... it can be at zero and I can shut the truck off for a split second and crank it back up and it will go to 40-45 for a few seconds then drop back to 20 then after a minute drop to zero.... I have added multiple types of additives to help it and nothing has helped... I drive it daily and this has been an issue for about 3 weeks so I assume nothing terrible is wrong... I seen there are 4-5 different senders that are listed as an "exact fit" for the jeep 4.0 on Advance Autos site... does anyone have the exact part number for the correct one for a 96 model 4.0?
Gonna ditch the FRAM filter first and see if that helps...also looks as though the seal on the oil filter adaptor is leaking slightly... could this be a problem as well?
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post #65 of 137 Old 03-24-2013, 12:25 PM
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The OFA leak is not it. I hate FRam. Period. Get it off of there and use a Wix, Napa Gold, or Mopar. All good quality, inexpensive, and easy to find.
Have you ever shined a light into the oil filler hole to see how sludgy your engine is inside?

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post #66 of 137 Old 03-24-2013, 07:28 PM
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thnx cruiser... I went out today and got a NAPA Gold filter, Rotella 5w40 T6 like someone suggested and swapped it all out.... absolutely no change... actually after a while, it got worse.. dropped to zero and stayed there... would not come back up... so I left it running and had my wife watch the needle while I fiddled with the wires going to the sensor... I would unplug it and plug it back in and it would go up for a second and drop again... so I thought, maybe I have it screwed in too far.. so I started loosening it until it started to leak and then back in again... to my amazement, it went up to almost 40 at idle... so then I loosened it till it leaked again and noticed it was blowing bubbles, so I let it blow till it was straight oil, then tightened it back up and now it sits at about 38 at 800rpm idle and goes to almost 50 cruising on the highway... hasn't hiccuped since... so I guess I figured out that you have to bleed the fitting with the engine running to install a new pressure sensor....
So, so far it seems to be FIXED!...
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post #67 of 137 Old 03-24-2013, 09:09 PM
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Quote:
Originally Posted by BAMF_Zj
thnx cruiser... I went out today and got a NAPA Gold filter, Rotella 5w40 T6 like someone suggested and swapped it all out.... absolutely no change... actually after a while, it got worse.. dropped to zero and stayed there... would not come back up... so I left it running and had my wife watch the needle while I fiddled with the wires going to the sensor... I would unplug it and plug it back in and it would go up for a second and drop again... so I thought, maybe I have it screwed in too far.. so I started loosening it until it started to leak and then back in again... to my amazement, it went up to almost 40 at idle... so then I loosened it till it leaked again and noticed it was blowing bubbles, so I let it blow till it was straight oil, then tightened it back up and now it sits at about 38 at 800rpm idle and goes to almost 50 cruising on the highway... hasn't hiccuped since... so I guess I figured out that you have to bleed the fitting with the engine running to install a new pressure sensor....
So, so far it seems to be FIXED!...
That could do it lol

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post #68 of 137 Old 03-24-2013, 09:12 PM
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The best oil filter period is a "fleet guard" it's like a oil filter with a metal screen, then fabric stuff, then a paper element!! You can order them from cummins filtration!! I use them when there available!!

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post #69 of 137 Old 03-24-2013, 10:03 PM
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Quote:
Originally Posted by BAMF_Zj View Post
thnx cruiser... I went out today and got a NAPA Gold filter, Rotella 5w40 T6 like someone suggested and swapped it all out.... absolutely no change... actually after a while, it got worse.. dropped to zero and stayed there... would not come back up... so I left it running and had my wife watch the needle while I fiddled with the wires going to the sensor... I would unplug it and plug it back in and it would go up for a second and drop again... so I thought, maybe I have it screwed in too far.. so I started loosening it until it started to leak and then back in again... to my amazement, it went up to almost 40 at idle... so then I loosened it till it leaked again and noticed it was blowing bubbles, so I let it blow till it was straight oil, then tightened it back up and now it sits at about 38 at 800rpm idle and goes to almost 50 cruising on the highway... hasn't hiccuped since... so I guess I figured out that you have to bleed the fitting with the engine running to install a new pressure sensor....
So, so far it seems to be FIXED!...
I'm wondering if you didn't bleed it, but blew a chunk of crap out just like the OP of this thread described ......

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post #70 of 137 Old 03-25-2013, 03:32 PM
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...well I guess I spoke too soon... It ran great last night, for a long time... got up this morning, and stuck at zero again... drove it all the way to work(25 miles) with no problems...still sounded great when I got to work... checked the oil and it was a little low from the oil change yesterday... so at lunch I added a little and the pressure went right up... then a few minutes later, back to zero again... So I did the bleed test again... got a few bubbles, but didn't help the pressure... so then I started to back the sensor out a couple of turns..the more I backed it out, the more the pressure on the gage came up...I am starting to think that Advanced Auto gave me the wrong sensor...
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post #71 of 137 Old 03-25-2013, 04:17 PM
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Originally Posted by BAMF_Zj View Post
...well I guess I spoke too soon... It ran great last night, for a long time... got up this morning, and stuck at zero again... drove it all the way to work(25 miles) with no problems...still sounded great when I got to work... checked the oil and it was a little low from the oil change yesterday... so at lunch I added a little and the pressure went right up... then a few minutes later, back to zero again... So I did the bleed test again... got a few bubbles, but didn't help the pressure... so then I started to back the sensor out a couple of turns..the more I backed it out, the more the pressure on the gage came up...I am starting to think that Advanced Auto gave me the wrong sensor...
Have them swap it out, the first one I bought from Advance was bad, the replacement has been working pretty good.
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post #72 of 137 Old 03-25-2013, 04:18 PM
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Go to the dealer and get one

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post #73 of 137 Old 03-25-2013, 06:56 PM
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Go to the dealer and get one

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Or NAPA and get the Echelin brand. Never had an issue with a NAPA part.

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post #74 of 137 Old 03-25-2013, 07:33 PM
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Originally Posted by FernBchJeep

Or NAPA and get the Echelin brand. Never had an issue with a NAPA part.
Yah I like NAPA, NAPA is good stuff and they know what there talking about (most of the time lol)

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post #75 of 137 Old 03-26-2013, 07:15 PM
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Can the plug type fitting that the sending unit screws into be removed and cleaned?
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