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Unread 02-27-2009, 11:42 PM   #1
ChairKey00
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2000 Cherokee - Issues after oil changes

Over the last few oil changes, I've noticed that my Jeep will act differently right after I change the oil. These differences will eventually go away after about 1500 miles, but will return when I change the oil again.

After an oil change:
-Idle is a little rougher.
-Oil pressure range changes. 10psi less at idle and 10psi more while driving.
-Slight ticking noise from under the valve cover.

Is this normal and if not, should I think about a heavier weight oil or some sort of oil additive? I'm currently running Valvoline MaxLife 10/30.
Thanks in advance.

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Unread 02-28-2009, 06:24 AM   #2
tjwalker
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I'm not seeing the correlation of an oil change to an idle quality issue.

The oil you're using is good quality and should be fine for your climate. Shouldn't need any oil additives. How many miles on the engine?

The only thing I can think of is filter; what type are you running? You could try using a different brand and see if that makes any difference. I've seen "subtle" differences with different brands. I now use Purolator Pure One. To each their own but stay away from el-cheapos. There are big differences in the materials, construction, and performance.
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Unread 02-28-2009, 07:15 AM   #3
Barnfind
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I am having this same issue, just changed the oil and now she is alot more chatty in the morning. Same with the oil pressure. 99000 miles on mine, first time chaning the oil I just picked her up a week ago. So I have nothing to compare to with this rig
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Unread 02-28-2009, 10:55 AM   #4
CJ7-Tim
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What brand of oil filter ?

Read this - http://minimopar.knizefamily.net/oil.../opinions.html
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Unread 02-28-2009, 02:16 PM   #5
ChairKey00
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I normally run a Purolator Pure One, but while Autozone was offering a special on 5qrts and an STP filter, I picked up one of those.
My Jeep has 116K and still runs great, just noisy after the oil has been changed. Like someone else mentioned above, I get alot of chatter right after an oil change.
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Unread 02-28-2009, 02:33 PM   #6
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Hopefully I am pointing out the obvious, but 4.0L Jeep engines takes 6 quarts of oil. You did remember to get the sixth quart when you bought the special at Autozone?
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Unread 02-28-2009, 09:38 PM   #7
ChairKey00
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Quote:
Originally Posted by Fire-XJ View Post
Hopefully I am pointing out the obvious, but 4.0L Jeep engines takes 6 quarts of oil. You did remember to get the sixth quart when you bought the special at Autozone?
Lol, yes of course. Good question, but yes, I keep extra quarts around for that reason.

Is anyone using 10/40 in thier Jeep?
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Unread 02-28-2009, 10:22 PM   #8
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Yup, started using Pennzoil 10W-40 when I hit 100K miles; it's got 141K on the clock now. No problems on mine after an oil change. I fill the new filter with fresh oil before I screw it on even tho' the filter is horizontal, if you're fast, you won't lose any oil. I hate installing an empty filter, it's like pushing a quart of air thru your system. When I hit 200K miles I'll switch to 20W-50.
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Unread 03-01-2009, 06:01 AM   #9
tjwalker
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Quote:
Originally Posted by ChairKey00 View Post
I normally run a Purolator Pure One, but while Autozone was offering a special on 5qrts and an STP filter, I picked up one of those.
I don't believe that the STP filter is a higher end filter. If you want to see if that particular filter has anything to do with this, go back to one of your Purolator Pure One filters. It might not make any difference but it's something you could try in 10 minutes.

If it doesn't change the chatter, your 4.0 is just starting to get a bit noisy. Join the club! Not abnormal and doesn't signal impending doom. Additives are hit and miss and may not be particularly effective.
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Unread 03-01-2009, 06:41 AM   #10
ChairKey00
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Quote:
Originally Posted by tjwalker View Post
I don't believe that the STP filter is a higher end filter. If you want to see if that particular filter has anything to do with this, go back to one of your Purolator Pure One filters. It might not make any difference but it's something you could try in 10 minutes.

If it doesn't change the chatter, your 4.0 is just starting to get a bit noisy. Join the club! Not abnormal and doesn't signal impending doom. Additives are hit and miss and may not be particularly effective.

From what I've read, the STP is a lower end filter, both in performacne and build materials. I would change it out, but my probles occured when I was still using Purolator/

I realize vehicles get noisier over time, thats just par for the course. However, the only time mine gets noisy is after an oil change. After a few miles, it;s gets better. This leads me to belive the problem is fixable.


I too fill the oil filter before I put it on. Like you said, it's piece of mind and if you're fast enough, you won;t spill any. I'm leaning towards switching to 10w40 on my next change to see if that makes any difference.
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Unread 08-05-2009, 09:48 PM   #11
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It's been awhile and I still haven;t been able to pinpoint my issue. The chatter has gotten just a tad louder after I switched to 10W40.

The noise seems to be coming from the back, lower part of the engine. I also noticed that if I'm idling with the front of the Jeep facing uphill, the chatter is almost non-existant...wierd. Any more ideas?
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Unread 08-05-2009, 09:53 PM   #12
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Have you had any other issues with the engine at all...Cooling issues maybe?
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Unread 08-05-2009, 10:06 PM   #13
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Flywheel bolts loose? It doesn't really explain the come and go symptoms but can cause chattering.

-Justin
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Unread 08-05-2009, 10:29 PM   #14
kenC
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I'm not saying this is your problem cause its very rare but I worked at a shop and had a jeep with a 4.0 and the oil pump went bad.The symptoms were very low oil pressure and top end was very noisy.They put a new oil pump in but still wasn't getting enough pressure so they went to a high flow.The engine lasted a few months and ended up blowing up.By the time the customer brought it in the magority of the damage was already done.
This probably won't help you but I figured I throw it out there anyway,something to think about.
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Unread 08-06-2009, 10:53 AM   #15
AZ Jeff
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How about a bad (worn) thrust bearing on the crank? That would explain noise reduction when facing uphill.
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