3.8L ticking sound - JeepForum.com
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post #1 of 33 Old 06-06-2012, 09:49 AM Thread Starter
thedude386
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3.8L ticking sound

Hello everyone, my 2011 Wrangler Sport has developed a ticking sound and I am unsure if I should be concerned. I do not remember how long this sound has been occurring, but I just noticed it one day. I have almost 23K miles and have done regular oil changes with Mobil 1 Synthetic 5W-20 about every 5K miles. Below is the video. The noise appears to be coming from the top of the engine. Since I am still under warranty, I was planning on taking it in to have the dealer look at it after I clean some of the mud off. Also, no engine or exhaust modifications have been made.

http://www.youtube.com/watch?v=KeTzS...ature=youtu.be

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post #2 of 33 Old 06-06-2012, 10:07 AM
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post #3 of 33 Old 06-06-2012, 10:08 AM Thread Starter
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Thanks, but I have the 3.8L and not 3.6L pentastar.
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post #4 of 33 Old 06-06-2012, 10:38 AM
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Listening to ticking sounds from a YouTube clip isn’t really the ideal way to diagnose the problem you might have. You might want to take it to an independent shop or two and have them have a listen, it will cost you nothing. If they determine that something is indeed wrong then when you take it to the dealer you’ll have something to back you up if they tell you it’s normal.
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post #5 of 33 Old 06-06-2012, 10:40 AM Thread Starter
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Thanks!
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post #6 of 33 Old 06-06-2012, 10:43 AM
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if the ticking is only when the engine is cold (i.e. it goes away after a while) then check the exhaust manifold for small cracks.
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post #7 of 33 Old 06-06-2012, 10:51 AM
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Mobil 1 5W20 synthetic. There's your problem.

Try using a "heavier" oil, and a regular conventional blend is even better. Mine ticked like a sewing machine until I started using conventional 5W30.

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post #8 of 33 Old 06-06-2012, 10:57 AM
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Quote:
Originally Posted by WXman View Post
Mobil 1 5W20 synthetic. There's your problem.

Try using a "heavier" oil, and a regular conventional blend is even better. Mine ticked like a sewing machine until I started using conventional 5W30.
Yeah do this and void your warranty
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post #9 of 33 Old 06-06-2012, 11:13 AM
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Originally Posted by chowner View Post
Yeah do this and void your warranty
no, it won't.
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post #10 of 33 Old 06-06-2012, 11:24 AM
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no, it won't.
explain?
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post #11 of 33 Old 06-06-2012, 11:45 AM Thread Starter
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I am kind of curious to that as well. I have always changed my own oil, and I neglected to save receipts of the Oil that I bought, However I did keep a log of each filter that I used and the oil used. I have always used the WIX 51516 extended filter with full synthetic oil. Additionally, I have always cut my oil filters open and inspected the filters for shavings and have not seen anything out of the ordinary in the past. That still doesn't mean that something happened since the last oil change. I am actually due for another change soon, but I am debating on if I should change it before or after I take it to the dealer. If they do some work and tear apart the engine, then I would have to think that they would change the oil which would mean it would be a waste for me to change it before I take it to them. At the same time, they could see that it is time for an oil change and say that if I change my oil the problem will be fixed even though I think I was hearing this noise before I changed the oil last time but couldn't remember if I had always heard this noise or if it was new. I also do not remember if it went away when I changed my oil before and just came back.
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post #12 of 33 Old 06-06-2012, 12:05 PM
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Try changing to conventional oil and see if it quiets down.

Mine: 2012 Sport S, Black, de-badged, Auto, Power/Connectivity, and damn proud of my 3:21's :)
Hers: 2010 Sahara, dual top, all the goodies...

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post #13 of 33 Old 06-06-2012, 12:15 PM
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Quote:
Originally Posted by chowner View Post
explain?
The warranty doesn't require 5w-20. That is the manual's recommendation (most likely to meet CAFE). The requirement is an oil that is API certified and meets the MS6395 specs. Many brands and many weights will meet those both.

The 3.8 have been around for a while and were built to use 10w-30. some folks with oil-burners swear by xw-30. One fellow posts about his experiences using 15w-40 (on another forum, in a hot climate).

Personally, I use M1 5w-20 and change within 500-1000 miles of the OCI.

OP's ticking may not be oil related.

I'd drop it off the night before and have them listen to the cold start up. It's a tough call, listening to the video but that has a bit of an exhaust sound to my ears. Not so much a valve clatter. But I can't tell.
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post #14 of 33 Old 06-06-2012, 12:17 PM Thread Starter
thedude386
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Quote:
Originally Posted by SRM View Post
Try changing to conventional oil and see if it quiets down.
I was under the impression that it wasn't a good idea to switch between synthetic and conventional. Something about how the engine breaks in. Would switching to a blend be a better idea since I have been using synthetic.

I got this information from my girlfriends dad who is a GM engine Tech for development engines.
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post #15 of 33 Old 06-06-2012, 12:59 PM
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The 3.8L shipped with conventional, and conventional is the only thing the dealership will use unless you ask otherwise. Why are people switching to synthetic? The change interval is "no more than 8,000 miles" according to the owners manual...so synthetic is a waste of cash.

'92 YJ - heavily modded
'96 ZJ - heavily modded
'05 KJ CRD Limited - 370 lb./ft. from a 4-cylinder and trail ready. Pure awesomeness.
'11 Mango Tango JKU Sport - Mods
'12 Dozer JKU Sport S - 6-speed - ACE rock rails - Max Tow package - Daystar spacers - 33x12.50 Duratracs
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