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Old 10-22-2009, 01:49 PM   #1
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Unhappy 09 JK detonation?

I have a 2009 Wrangler X manual transmission and recently it has been giving me some rattling sound from under the hood. It is only when i press on the gas pedal and only when i am in gear. it is more noticeable when i go up a hill and at lower RPMs, but you can still hear it when im on flat ground and at higher RPMs too. it is not a constant rattle, well not all the times anyway.

I brought it to Jeep/Crystler service and they noticed that it sounded like a detonation problem. then after a day of having my jeep they told me that it is normal for this to happen on the new stickshift models and that my engine checked out to be all normal. SOUNDS LIKE BULL****! they said it may just be bad gas, but ive been to a lot of different gas stations over the period this has been going on and there is no way i have encountered bad gas the whole time...

I was given a suggestion to put a higher octane like 89 instead of 87 regular, that a good idea?

does anybody know if there is a solution? please help.

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Old 10-22-2009, 03:55 PM   #2
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A higher octane is not a solution. The JK was designed to run on 87.

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Old 10-22-2009, 05:10 PM   #3
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What the service guys told you sounds like bull to me...
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Old 10-22-2009, 05:13 PM   #4
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I have had nurmours standards , 1 thing that I noticed with all there is a small amount of noise if it is in gear and your in to high of gear for the speed or in to high of gear going up a hill , and also this noise would go away when clutch engaged or in nuetral , might be normal I dont know , just giving what I have noticed in the past
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Old 10-22-2009, 07:35 PM   #5
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I just read TSB H06 "Emission Recall Spark Plugs"
During two production days Feb 17/18 2008, Chrysler found a way to install the wrong spark plugs into their 3.8L engines..Apparently according to the TSB all has been "contained" and "fixed" (440 units).

Now here is the reason why I post this..With todays fail safe assembly systems this should never have happened.. However it did.. and my guess is it will happen again..( in small numbers of course..)

So my suggestion to the OP is to have the spark plugs checked for being the correct ones..
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Old 10-23-2009, 09:39 AM   #6
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Yep- I bet dollars to donuts you're just lugging it.
"When I go up a hill at low RPM"
Bingo.
If you have the 32" tire/wheel package and 3.21 gears, you simply need to keep your revs up. Under 2k going up a hill, you're lugging it.
The OEM gearing SUCKS- that's why every JK/LK I order, I either get 3.73's, or automatic. 3.21's ONLY work well with the base model 29" tire/wheel package.
How low of RPMs are you doing here? Mark W.
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Old 10-23-2009, 02:38 PM   #7
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it happens at lower rpms mostly between 1000-3000, sometimes at higher rarely, sometimes not at all. I just got it back from a second dealer service for a second opinion. Again, the car checks out normal, and i was told it was detonation and to try different gas...i did not check the spark plugs but is that even a cause of detonation?

I mean its not normal, when i test drove the car it did not detonate, nor has it for the first 6months that ive had it. its brand new... i dunno.... my mechanic friend who has a TJ told me to throw some 93 in to see if it clears up.
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Old 10-23-2009, 02:53 PM   #8
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I wonder if some horse sh@ got mixed up with the ethanol and has fouled up the cylinder? Seriously though, if the wrong plug is in there, it may have gradually fouled up the cylinder to the point that now you are seeing detonation?
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Old 10-23-2009, 02:56 PM   #9
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Quote:
Originally Posted by thaduke2003 View Post
Yep- I bet dollars to donuts you're just lugging it.
"When I go up a hill at low RPM"
Bingo.
If you have the 32" tire/wheel package and 3.21 gears, you simply need to keep your revs up. Under 2k going up a hill, you're lugging it.
The OEM gearing SUCKS- that's why every JK/LK I order, I either get 3.73's, or automatic. 3.21's ONLY work well with the base model 29" tire/wheel package.
How low of RPMs are you doing here? Mark W.
In his next post after yours, he says 1k to 3k rpm. I shouldn't think it would happen between 2k and 3k would it?
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Old 10-23-2009, 02:58 PM   #10
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well ill order some new performance spark plugs. i was going to anyway and lets see if that helps.
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Old 10-25-2009, 11:02 AM   #11
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To me if it was detonation it would do it if it was in gear or not , the tranny has nothing to do with causing detonation I would think . Does the rattle come from dead center lower part of firewall??
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Old 10-25-2009, 08:47 PM   #12
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I have a similar problem in my '09, only mine happens between 2k and 3k and its an auto. The dealer pretty much told me the same thing, its a spark knock and that its normal. They said the quality of 87 octane is horrible nowadays and thats whats causing it, but its nothing to worry about.

(I have found some brands of gas that make it better, but none get rid of it completely)
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Old 10-26-2009, 03:14 PM   #13
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Cool

Quote:
Originally Posted by granitefan713 View Post
I have a similar problem in my '09, only mine happens between 2k and 3k and its an auto. The dealer pretty much told me the same thing, its a spark knock and that its normal. They said the quality of 87 octane is horrible nowadays and thats whats causing it, but its nothing to worry about.

(I have found some brands of gas that make it better, but none get rid of it completely)
yeah i agree with you man. I been using Shell mostly, but m going to switch i hear Sunoco is very good. Also ive put 93 octane and it has calmed the pinging. But, it is still pinging on steep inclines. i guess il just turn the radio louder haha!
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Old 10-27-2009, 03:54 PM   #14
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Quote:
Originally Posted by 09Wranglerx View Post
yeah i agree with you man. I been using Shell mostly, but m going to switch i hear Sunoco is very good. Also ive put 93 octane and it has calmed the pinging. But, it is still pinging on steep inclines. i guess il just turn the radio louder haha!
Yeah, thats what I do, turn it up, haha. For me, Sunoco was the worst, BP made it better, I'm trying Exxon now, and it seems pretty good so far (knock on wood).
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Old 11-05-2009, 12:17 PM   #15
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so nothing has helped my problem. i've used all of these suggestions already to no solution. brought her back to dealership, caused a little scene, and got the shop forman to personally deal with it himself. just got a call an hour ago. he has heard the loud sound, and is "baffled" as to where it is comng from. has to contact chrystler manufacturers directly.....i miss my baby.

it might be a lemon...

on the bright side i got a JEEP COMMANDER rental free from them. its a nice ride
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Old 11-06-2009, 09:50 PM   #16
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I had the same problem; I use 89 now, which might be comparable to the old 87 and no issues now
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Old 11-07-2009, 01:21 PM   #17
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If I have straight regular in the tank and let it lug just a little bit going up hills it will ping a very slight amount.

Todays fuel is of such poor quality. If the fuel quality was better the manufactors could put some compression back in these motors and they wouldn't be such a weak suck motor.

I'd like to see what a good valve job and an honest 9-1 compression would do in one of these 3.8's on some decent fuel.

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