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Old 03-06-2017, 09:22 AM
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Knocking Upon Acceleration

I have a 2013 JKU, so it has the 3.6 in it with an automatic. Upon acceleration and when the RPMs are 2500+ there is a ticking/knocking. The vehicle then shifts and stops knocking until it hits that same point. Once it hits cruising speed and the RPMs are low I cannot hear it.

I have noticed that after an oil change this noise seems to go away for about 1500 miles. Then it comes back. I have checked the oil levels and since they were slightly lower I added some more oil to see if that was the culprit. It was not. I also verified that that coolant was within the range according to the reservoir.

Has anyone had this same issue, if so what did you do to fix this? Could this be spark knock?

I am using Mobil One full synthetic with a WIX filter currently. This problem also occurred when use Quaker State full synthetic as well.

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Old 03-06-2017, 10:38 AM   #2
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My 2011 with the 3.8 would knock (ping) if I ran 89 octane gas. It wouldn't do it if I ran 91 or 93. So far, my 2013 hasn't done it on the low grade gas.

Try a tank or two of a higher grade gas and see what happens.

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Old 03-06-2017, 11:11 AM   #3
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Are you running any kind of aftermarket tune or intake? It sounds like your engine is running lean and the ping you hear is detonation which usually occurs at higher rpm's. Like the post above said the first thing is try a higher octane gas, or a different brand in case you got a bad tank of gas.
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Old 03-06-2017, 11:22 AM   #4
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Seafoam
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Old 03-06-2017, 11:28 AM
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I will be getting gas on lunch and planned on giving 93 a shot. I have done this in the past and it took care of it, IIRC. I have gotten gas at a few different places around town and have noticed no difference.

If the better gas does fix this, is there a "fix" for this or will the gas just be the bandaid for this? Also, no tune or anything aftermarket that would impact this. Lights are the only thing that has been changed.
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Old 03-06-2017, 12:07 PM
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Seafoam
Any personal experience with that?
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Old 03-06-2017, 12:09 PM   #7
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Use it quite often. 1/2 can every 10 fill ups or so.
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Old 03-06-2017, 12:19 PM
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Use it quite often. 1/2 can every 10 fill ups or so.
Is that into the tank only or in the tank and the intake?
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Old 03-06-2017, 12:27 PM   #9
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straight into the tank
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Old 03-06-2017, 02:35 PM
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straight into the tank
Thanks, I may stop on the way home to grab some of this.
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Old 03-07-2017, 11:19 AM
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If anyone else has experienced this or has suggestions, it would be greatly appreciated.
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Old 03-08-2017, 08:09 AM   #12
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Again, if it's pinging your engine is running lean for some reason, either not enough fuel or too much air. Maybe you've got a vacuum leak some where and you're getting un-metered air, if so the computer won't compensate for it and richen the fuel mixture. Take a can of carb or TB cleaner and spray it around the intake area and see if the rpm's rise and if they do you've got a leak.
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Old 03-08-2017, 08:23 AM   #13
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Thanks, I may stop on the way home to grab some of this.
It took a couple cans until I noticed a difference... that being no more annoying ping under acceleration. YMMV
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Old 08-25-2017, 10:12 AM
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Update. I finally was able to get it into my service department and it was indeed spark knock. Which I thought it was. They "fixed" this and it was better with only a very small knock once in a while for about a week. I figured this was just some left over carbon build up that was getting broken free after they did the "3 step fuel system cleaning."

Well yesterday driving home it was back. Taking this POS back in yet again. Since I've owned the CPO Wrangler it will be the 5-6th time being in the service department. 3-4 times was for a leaky roof which they never fixed and I took care of that myself.

It's time Jeep invests in some training material for these subpar "mechanics."

I have called my service department and am waiting for a call back. I paid for this to be resolved it and is not, so I expect to be compensated in some sort. I have had nothing, but a bad experience with this company.
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Old 08-25-2017, 11:26 AM   #15
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Update. I finally was able to get it into my service department and it was indeed spark knock. Which I thought it was. They "fixed" this and it was better with only a very small knock once in a while for about a week. I figured this was just some left over carbon build up that was getting broken free after they did the "3 step fuel system cleaning."

Well yesterday driving home it was back. Taking this POS back in yet again. Since I've owned the CPO Wrangler it will be the 5-6th time being in the service department. 3-4 times was for a leaky roof which they never fixed and I took care of that myself.

It's time Jeep invests in some training material for these subpar "mechanics."

I have called my service department and am waiting for a call back. I paid for this to be resolved it and is not, so I expect to be compensated in some sort. I have had nothing, but a bad experience with this company.
Hi pjerzy,

Sorry to hear about your ongoing concerns with your vehicle! Have you contacted our customer care team to have a case opened for further assistance and to document your concerns? If not please send us a PM with your VIN so I can start that process for you.

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Old 08-25-2017, 01:32 PM
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Hi pjerzy,

Sorry to hear about your ongoing concerns with your vehicle! Have you contacted our customer care team to have a case opened for further assistance and to document your concerns? If not please send us a PM with your VIN so I can start that process for you.

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Andrea, these aren't really concerns they are clear mess ups by the dealership/company. I am not intending to project this frustration onto you however when the vehicle was at the shop for 4 days to fix this issue before and informed that if I wanted a loaner I would have to pay for it. Now, it needs to go back for the exact same issue that I already paid to have fixed, so will I have to pay to get a loaner now? Will I be refunded labor and supplies from the previous supposed repair? Doubtful.

I will be reaching out to you with my VIN number so this incident and the multiple service failures can documented.
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Old 09-05-2017, 03:35 PM
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Figured I would update the thread, for those that care or may be experiencing similar issues.
The stealership had the vehicle for 4 days and was "working" on it the entire time. They informed me on Wednesday evening that it was cam phasers, I am not exactly sure what these do even with the quick research that I did so I cannot speak on them. They were apparently off and not working properly. So those were replaced along with quite a few gaskets (do not have the sheet in front of me, but can send those to anyone interested) and completed an oil change. They then supposedly drove it around for 15-20 minutes and didn't hear anything.

I picked the vehicle up last Friday 9/1/17 in the morning and drove around fro about 20-30 minutes after work to see he the work indeed fixed it. My doubts were confirmed as it did it shortly after I drove around the city in traffic. Also, I noticed that when on a colder start there is a water sloshing around sound behind the dash, which never happened before. So, I take it in and it comes back with more problems.

To add insult to injury, the service department decided to dent/chip my fenders by slamming my metal hood latches down. I can confirm this wasn't me as I put a towel down on each side to prevent this.

I have lost all confidence in this service department and more specifically in this service tech who clearly has zero respect for others property. I would take it to a different dealerships service department however I do not want to have to pay for the service that they would do. If this gets dragged on for a few days then I will be requesting a more senior technician to complete this repairs.

I do have a case open up with Chrysler for these issues, which has been beneficial. Chrysler has agreed to refund me for my previous paid service. Which seems right to me, if something doesn't work properly as it should from a store you can take it back. I only see it fit that a misdiagnoses and unneeded repair be the same.

Now, the Jeep in the shop yet again. Number 7!
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Old 09-05-2017, 04:37 PM   #18
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I'm sorry to hear of these issues. I know they are frustrating - especially when you pay for these repairs.

With that said - the "sloshing of water" sound you hear behind the dash at start up is simply an air bubble in your cooling system (not sure if they drained it to fix the cam phasers) and it needs to be burped. Nothing major - but needs to be fixed. The proper way to burp it can take around an hour or so - so, if the dealer did drain it, then my guess is they didn't spend the hour to get the air out.
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Old 09-06-2017, 02:36 PM
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I'm sorry to hear of these issues. I know they are frustrating - especially when you pay for these repairs.

With that said - the "sloshing of water" sound you hear behind the dash at start up is simply an air bubble in your cooling system (not sure if they drained it to fix the cam phasers) and it needs to be burped. Nothing major - but needs to be fixed. The proper way to burp it can take around an hour or so - so, if the dealer did drain it, then my guess is they didn't spend the hour to get the air out.
Thank you. If they are unable to figure out what it could be, I will let them know to check this out.
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Old 09-06-2017, 02:40 PM
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Another update. The dealer has called me this morning stating that they think it may be the PCM causing this issue. Now, that does not make since how a computer could be causing this but I am not a certified mechanic just an IT Engineer. Once I receive the Jeep back and go for another 30+ minute drive and see how it goes. I am not expecting this to be the resolution of this issue, but we shall see.
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Old 09-06-2017, 03:15 PM   #21
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Something is not making sense here. You say that after a oil change this knock goes away for about 1500 miles, correct? And if this is correct nothing in the PCM can be causing this problem unless they disconnect the battery for every time they change the oil as that would reset the PCM.
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Old 09-06-2017, 04:21 PM
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Something is not making sense here. You say that after a oil change this knock goes away for about 1500 miles, correct? And if this is correct nothing in the PCM can be causing this problem unless they disconnect the battery for every time they change the oil as that would reset the PCM.
As time went on the problem consistently got worse. So my guess is that the oil change would hide the noise a little bit. Then it would come back. After the most recent oil changes it would happen right away.

I apologize for not mentioning that in one of the updates.
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Old 09-06-2017, 04:24 PM   #23
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Just curious, but what type of gas do you use?
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Old 09-06-2017, 07:24 PM   #24
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Something is not making sense here. You say that after a oil change this knock goes away for about 1500 miles, correct? And if this is correct nothing in the PCM can be causing this problem unless they disconnect the battery for every time they change the oil as that would reset the PCM.


I can believe it's the PCM, after all that is what is responsible for setting a/f mixture and ignition timing. If it's self-adjusting based on invalid input (it's misreading a sensor for example), then it might make sense for it to deteriorate over time.


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Old 09-06-2017, 07:34 PM   #25
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I can believe it's the PCM, after all that is what is responsible for setting a/f mixture and ignition timing. If it's self-adjusting based on invalid input (it's misreading a sensor for example), then it might make sense for it to deteriorate over time.


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I would agree now that we have all the info. But when he said it did not start knocking for about 1500 miles after a oil change it does not make sense. Oil has nothing to do A/F mixture or ignition timing.
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Old 09-07-2017, 09:08 AM
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Just curious, but what type of gas do you use?
regular. When I first noticed the knocking I switched to 93 hoping that would help clean out whatever was built up. I would run a few tanks of that then the knocking would be clearly audible in the cabin when the windows where closed. The knocking did quiet down after 93 was added for the but was still there during the switch to premium.
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Old 09-08-2017, 09:03 AM
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Update.

Yesterday I heard the water noise again after taking the Jeep to the store around 8pm last night. I did not hear that noise this morning around 630am though.

After the PCM/ECM was replaced I still have heard the knocking when going up a hill. I heard this on the drive around town after picking the Jeep up. Also, had this happen when running to the store. On my lunch today I plan on taking an extended drive to see what exactly "makes it tick." The service manager has now requested a ride along with me. I feel as if they don't believe me, but I can't blame them for trusting their employees over a frustrated (but not wrong) customer. I have yet to be wrong when informing them that it was not resolved.
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Old 09-08-2017, 04:37 PM
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Spoke with the service manager today. He requested that if I can recreate the problem to have him ride along. I was able to and we took the Jeep out for less than half a mile and he was able to hear it. I will be dropping it off Monday morning. I requested to have a different tech look at this vehicle as the previous caused smaller scratches and the service manager informed me that would not be a problem.
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Old 09-09-2017, 12:38 PM   #29
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I am guessing you have a bad knock sensor. I don't think the PCM will throw a code until it fails. But if it is working but not up to full specs I would think could cause a knock.
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Old 09-13-2017, 03:45 PM
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Update

After bringing the Jeep in for the 4th time for this issue, they have had it since Monday and just looked at it yesterday afternoon.

My service adviser has informed me that the new tech that is looking at this states that this is a normal noise. When i questioned this and informed him that if it was a normal noise why was there three different services with parts replaced done already? There was no real answer for this. I then asked that if this was normal, why wouldn't it happen consistently through-out the gear range or at the same intervals? Again, no answer given other than he wasn't sure.

After the quick conversation he informed me that the tech was going to look into this a little more and see what else he could find out.

Metal on metal sounds in engines is never normal. There is an issue with this Jeep and since Yark is unable to fix this they claim it is normal. I am hesitant on going to another service department because I do not want to have to pay for a service again or go through this same type of ordeal.

I am at the point of not going back to this dealership or FCA again. I realize that my business is just a small drop in the bucket of money they receive and it will not make a difference, but to me its about the principle.

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