2008 JK Pinging in top gears

[Ash74]

G'day

Is anyone having issues with pinging. I run 98 only and have tried all the brands (best being Shell) but in fourth to sixth gear the engine costantly pings even when not under load.

I have informed Jeep on every service and they always come back with - We took a sample of the fuel and the fuel looked a bit suspect (exact words each time) try another service station.

Does anyone else have this problem or has a solution to this problem? opposed to turning the radio up.

[aussiejk]

I had this problem check the gaps of your spark plugs, an also get a check for any codes may have a knock sensor playing up. And in your jeep there is no point running 98 octane as its engine management system isn't tunned to run on it just your regular unleaded will be fine.

[Ash74]

Assiejk

If I run 95 its pings 10 times worse, and I will not run the ethonal mix. I will look at the knock sensor as advised

[aussiejk]

Assiejk

If I run 95 its pings 10 times worse, and I will not run the ethonal mix. I will look at the knock sensor as advised

you are only wasting your money by using expensive fuel, there is obvisouly a problem there that is causing it to ping my jk runs perfectly on e10 i get the same milage and same performace out of it, If you need any help let me know i am mechanic an can help you out... as i said in other post there is nothing wrong with ethonal, ethonal is man made petrol... made from sugar kane and other various renewable sources...

[Hunno]

the grand makes better km/p/l with the 98 & don't ping. 95 pings. the ethonal runs fine but km/p/l is down.

[Steve F]

Is it worth getting Jeep to replace the knock sensor? Or even just check the wiring on it your self and make sure it at least looks OK. It shouldn't ping with no load and even under load the knock sensor should force an adjustment of the timing.

Cheers
Steve

[Steve F]

the grand makes better km/p/l with the 98 & don't ping. 95 pings. the ethonal runs fine but km/p/l is down.

How much difference with the 98, I run ethanol most of the time but might try a tank of 98 on the trip to the cape if it makes a worthwhile difference. Has to be a fair bit as a tank is 120lt for me.

Cheers
Steve

[stevet]

In the ZJ I would get a least 50k's+ compared to using 95....... Got the same when I did use Ethenol but that was a 98 octane rating as well..................

[Ash74]

Ausiejk

I just completed a trip to Birdsville and back did some 5800ks. At one stage of the trip (when listening to the tiges play) I flattened the battery. I read on an american site that disconnecting the battery resets the computor, I have since heard no pinging at all and ran 95 (remote feul mostly) the whole time.

Thanks heaps for your offer of help

[karldiaz]

Hi,, I own a JK sports unlimited 2009 model automatic wrangler. same issue with pinging noise. i have always used 98. i have complained to jeep and they said change your fuel station. can anyone help?? any mechanic?

[karldiaz]

Hi,, I own a JK sports unlimited 2009 model automatic wrangler. same issue with pinging noise. i have always used 98. i have complained to jeep and they said change your fuel station. can anyone help?? any mechanic?
I bought this brand new and never used anything other than 98.

[Elio S]

Pinging is pre ignition. Pre ignition is often caused by advanced timing and/or high compression. It often shows up in an engine after you've had the head/s machined. Since timing is non adjustable on the JK and I highly doubt any of you have had head work done yet I can only assume the pinging issue is being cause by carbon build up in the cylinders or your engines have a hot spot in them. Carbon build up could be caused by frequent short trips and stop start city driving. Everytime I service my vehicle I spray a can of Subaru upper engine cleaner into the intake. It cleans up all the crap in the intake manifold and cylinder heads. The differance in perfomance is noteable. Only other thing is as somebody has already mentioned, is spark plug gap. You shouldn't have to adjust the gap as spark plugs are set from the factory, but it might be worth trying to find out if somebody has fitted the incorrect spark plugs to your cars. Hope this may help.
Also, I might add, as somebody who's job it is to attend stranded motorists on a daily basis, I have seen several incidents of e10 petrol fouling up spark plugs on modern engines, even ones that supposedly were designed to run on it. The way I see it, if it's not good enough for my lawn mower, I'm certainly not putting it in my car. My GC runs fine on standard 91 octane unleaded.