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Old 03-06-2014, 12:20 AM
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Exclamation 2011 Wrangler Engine Knocking - Please Help!

Hey All,

I'm new here and am having a serious problem. Yesterday on my way home from work my engine started knocking. When I got home I checked the dip stick to find there was clean oil on it. After letting the engine sit for a half hour, i checked the dip stick again to see that there was no oil on it at all. In December I put in 5 quarts of Royal Purple 5W-30. It's been running fine since then. Tonight I added an additional 5 Quarts of 5W-30 which makes the knocking stop for about 30 seconds before it comes back. I checked the spark plugs, the drain plug, the oil filter, and the coolant but I cannot see any leaks. The engine has 49K miles on it and i'm at a loss as to whats wrong or what to do.

Please Help!

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Old 03-06-2014, 01:17 AM   #2
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The 3.8L V6 that is in the 07-11 JK is known to use oil, but each engine will vary on how much it uses. The oil level should be checked at least once a month. I check my oil level a several times a month.....
The knocking was caused by the low oil level and probably low oil pressure. Depending upon how long the engine was driven like that will determine how much damage was done due to lack of lubrication.
Probably should check you oil pressure by connecting a manual oil pressure gauge to see what your oil pressure is at idle (15-20 psi) and at 1500 rpms (30-45 psi).
Bad connecting rod and cam bearings along with rocker arm fulcrums are the first things that come to mind. 8(

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Old 03-06-2014, 01:19 AM   #3
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Well welcome to the site.....Never dealt with it but here's a link to a thread about the same issue. Hope it helps.

https://www.wranglerforum.com/f274/no...ck-132730.html
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Old 03-06-2014, 03:25 AM   #4
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Quote:
Originally Posted by nicksola View Post
Hey All,

I'm new here and am having a serious problem. Yesterday on my way home from work my engine started knocking. When I got home I checked the dip stick to find there was clean oil on it. After letting the engine sit for a half hour, i checked the dip stick again to see that there was no oil on it at all. In December I put in 5 quarts of Royal Purple 5W-30. It's been running fine since then. Tonight I added an additional 5 Quarts of 5W-30 which makes the knocking stop for about 30 seconds before it comes back. I checked the spark plugs, the drain plug, the oil filter, and the coolant but I cannot see any leaks. The engine has 49K miles on it and i'm at a loss as to whats wrong or what to do.

Please Help!
You should always check you engine oil level every week, on a regular basis.

Your engine is either leaking, and or burning a great deal of oil. "Some of the 3.8 engines have this issue". No oil on the dipstick, with a engine knock, is a very serious concern. You have either scored a piston and cylinder wall, and or lost a rod bearing, due to oil starvation.
DO NOT START YOUR ENGINE, because you stand the risk of throwing a rod through the side of your engine block, which will cost you even more money!!!

You need to have it towed into a qualified repair shop and analyzed!
THIS IS VERY SEIOUS!!!
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Old 03-06-2014, 10:47 AM   #5
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A 2011 with 49k is under the factory power train warranty. Call the dealer and have it towed.
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Old 03-06-2014, 11:04 AM   #6
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Try switching to 5W30 or 10W30 oil for oil consumption. My 08 was consuming oil after I hit 60K km's. Since I have switched to 10W30 my JKU consumes about 1/2 liter of oil every oil change now.
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Old 03-06-2014, 11:34 AM   #7
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A 2011 with 49k is under the factory power train warranty. Call the dealer and have it towed.
When you run your engine out of oil, and cause damage, guess what, that ain't warranty.............

As owners, we are responsible to maintain our vehicles, and that included proper fluid levels..........

Had the oil consumption been logged, as oil was needed and added, then the factory would have been responsible to repair the cause of the high oil consumption! But that is not what happened...........
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Old 03-06-2014, 11:39 AM   #8
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Agree, however if oil was changed in December and burned all of it that quick, I would certainly think that is a factory defect. A sub 50k mile motor should not be doing that. I would definitely be contacting jeep dealer and insist they have it repaired.
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Old 03-06-2014, 11:52 AM   #9
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They may credit him the cost of a re-ring job, but the progressive damage he will have to pay for.
Factories are not very forgiving, when you run something out of oil!
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Old 03-06-2014, 02:18 PM   #10
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It's only a consumption issue for "Chrysler" if it uses more than 1 qt. per 1,000 miles. I don't agree but it's their call. However, in order to gauge consumption the oil has to be checked. Not checking the oil level on any engine for two months isn't proper maintenance. Same for tire pressure, etc. I still can't believe that some wait until the tpms goes off to put air in their tires or wait for the light to go on before putting gas in it.
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Old 03-07-2014, 05:48 PM
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Thank you everyone for your help. I ended up bringing the Jeep to the dealership. They are concerned with the fact that 5 quarts of oil disappeared and no warning indications came on. They said they have to take a part the engine now to see the damages. I'll post back after I get what they find.
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Old 03-15-2014, 10:46 AM
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Hey All,

So the engine is completely shot. The dealership ended up putting lifters on the heads but this did not resolve the problem, we had to take the engine apart and go deeper. They said the engine walls are scored, the pistons are scored and the rods have etched a ring into all of them, basically hollowing them. After taking everything apart they said the Jeep is in very good conditioned and appeared to be well maintained. They said they ran all the tests they could and this Jeep is not burning oil and there are no leaks. They said either the place that put the 5 quarts stiffed me and put 2 or 3 quarts in, or someone at my job has a problem with me and drained it before I took it home. I highly doubt it was the last oil change since I did that myself and I know I put in a 5 quart jug of RP 5W-30. I also saw no evidence of oil burning. The dealership said the reason my check engine light and oil light never came on is because there was still some oil being brought up through the pump but nothing was being delivered to the bottom half of the engine. In short the dealership is declining the repair under warranty and has asked me to purchase a new engine. The mystery of the vanishing oil continues. Still wish I knew why my oil decided to get up and walk out on me...
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Old 03-16-2014, 06:26 AM   #13
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Quote:
Originally Posted by Old Dogger View Post
When you run your engine out of oil, and cause damage, guess what, that ain't warranty.............

As owners, we are responsible to maintain our vehicles, and that included proper fluid levels..........

Had the oil consumption been logged, as oil was needed and added, then the factory would have been responsible to repair the cause of the high oil consumption! But that is not what happened...........
Correct. Warranties don't cover neglect, and state checking the oil is the owners responsibility. The dealer did exactly what I thought they would.
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Old 03-16-2014, 07:27 AM   #14
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Wth

"The dealership said the reason my check engine light and oil light never came on is because there was still some oil being brought up through the pump but nothing was being delivered to the bottom half of the engine."

That makes no sense to me. What is the point of having an oil or Check engine light...?
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Old 03-16-2014, 09:13 AM   #15
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Wow, ever own a car before ??
If it was foul play, the OP couldn't possibly have known the engine was empty. Now, not checking for 3 months is definitely on the OP. Still sucks that these engines burn so much and that Chrysler has set the threshold for a problem so high.

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