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engine ping
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=24801		 Page 1 of 1
Author:  libbygreen [ Thu Sep 27, 2007 10:24 pm ]
Post subject:  engine ping
I have been noticing a pinging similar to pre ignition knock when I come off highway speeds and turn onto another road and then accelerate normally. I have had it into 2 different dealers and neither one can hear it. Anyone else hear this noiise?

3.7 motor has 12,000 miles on it.
Author:  JJsTJ [ Thu Sep 27, 2007 10:32 pm ]
Post subject: 
How long has it been going on and what gas are you using?
Author:  libbygreen [ Thu Sep 27, 2007 10:50 pm ]
Post subject:  ping
about 2 months and i use 87. one dealer told me to use 89 but that didnt make any difference
Author:  Rush345 [ Fri Sep 28, 2007 12:20 am ]
Post subject:  Have you gotten any Error codes
Have you gotten any Error codes or try changing brands of Gas???? :?: :?: :? :?
Author:  sleeve84028 [ Fri Sep 28, 2007 7:43 am ]
Post subject: 
I'd switch gas stations first before trying anything else.
Author:  BeepBeepJeepJeep [ Fri Sep 28, 2007 9:02 am ]
Post subject:  Re: engine ping
libbygreen wrote:
I have been noticing a pinging similar to pre ignition knock when I come off highway speeds and turn onto another road and then accelerate normally. I have had it into 2 different dealers and neither one can hear it. Anyone else hear this noiise?

3.7 motor has 12,000 miles on it.


I have no idea if that's what it is or not, but I have noticed a noise similar to what it sounds like when you bring the clutch up too fast, but not nearly as aggressive. I only notice it when my windows are down, and the noise comes and goes pretty frequently for me...

It's hard to explain because it's hard to hear, but yes I believe I have the same noise but I also have 112k mi on mine...
Author:  onejohny [ Fri Sep 28, 2007 9:11 am ]
Post subject: 
I seem to have this too especially with the AC on. When I tried 93 octane it goes away but my mileage suffers.
Author:  hardhittinz [ Fri Sep 28, 2007 7:37 pm ]
Post subject: 
i have alittle bit of it to.
Author:  ryno [ Fri Sep 28, 2007 8:25 pm ]
Post subject: 
You might look into having your timing belt replaced. Your dealership should do that for you under warranty.
Author:  tjkj2002 [ Fri Sep 28, 2007 8:30 pm ]
Post subject: 
ryno wrote:
You might look into having your timing belt replaced. Your dealership should do that for you under warranty.
No timing belt in a 3.7L V-6 in the KJ,it does have 3 timing chains.
Author:  ryno [ Fri Sep 28, 2007 8:45 pm ]
Post subject: 
tjkj2002 wrote:
No timing belt in a 3.7L V-6 in the KJ,it does have 3 timing chains.


True that. It must have been a part for the 2.4L that I saw. Thanks for correcting me. After all, I'm just an ignorant college n00b!
Author:  myjeepwalks [ Sat Sep 29, 2007 1:52 am ]
Post subject: 
sleeve84028 wrote:
I'd switch gas stations first before trying anything else.


That's what i did and it solved my pinging, all depends on the station. I swear some of these stations must water it down to 47 octane. If i get quality gas i get no pinging. Junk gas pings and gets horrible gas mileage.
Author:  BeepBeepJeepJeep [ Sat Sep 29, 2007 10:02 am ]
Post subject: 
myjeepwalks wrote:
sleeve84028 wrote:
I'd switch gas stations first before trying anything else.


That's what i did and it solved my pinging, all depends on the station. I swear some of these stations must water it down to 47 octane. If i get quality gas i get no pinging. Junk gas pings and gets horrible gas mileage.


That's good information, thanks. Next time I fill up I'll go to a new station...
Author:  tjkj2002 [ Sat Sep 29, 2007 12:07 pm ]
Post subject: 
ryno wrote:
tjkj2002 wrote:
No timing belt in a 3.7L V-6 in the KJ,it does have 3 timing chains.


True that. It must have been a part for the 2.4L that I saw. Thanks for correcting me. After all, I'm just an ignorant college n00b!
You are right about the 2.4L 4-banger,it does have a timing belt.
Author:  DarbyWalters [ Sat Sep 29, 2007 12:13 pm ]
Post subject: 
The 3.7L is known to break valve springs...easy to check if you take vavle cover off. I had three cracked on one side at 50,000 miles. I also had a bad wrist pin...that was a bit more of a pain to fix. Bought the whole piston/rod assembly and replaced it thru the bottom end...I did run a stone to scratch the cylinder walls. Fixed the problem.
Author:  _UnLiMiTeD_ [ Sat Sep 29, 2007 9:32 pm ]
Post subject: 
known? first time i have ever heard of that problem lol
Author:  libbygreen [ Sat Sep 29, 2007 10:22 pm ]
Post subject:  ping
I am going to try a different gas station as suggested. Maybe I am being too picky if only I can hear it. But at least if engine damage is done because of it, it is documented that I have been in twice for an engine noise.

Thanks for all the replies. Love this board. I have Gotten a lot of great info from this site.
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