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Old 04-30-2014, 02:52 PM   #1
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what type of gas?

I have a 2014 JKU. What kind of gas am I supposed to put in? It came with a tank of gas from the dealership, but I had to refill it the other day for the first time. Not sure what the dealership put in, but I'd guess regular.

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Old 04-30-2014, 02:55 PM   #2
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87 octane is all you need unless it starts pinging, which it shouldn't, then move to 89 if it does.

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Old 04-30-2014, 03:05 PM   #3
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Mine pings a little on acceleration with 87 octane.
Not too thrilled with that...

Where'd you get yours, gapeach? I got mine at Troncalli in Cumming.
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Old 04-30-2014, 03:08 PM   #4
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Just as a heads up, "regular" and "premium" are marketing names. You will not gain any performance from a higher octane fuel. If the computer is smart enough, you won't lose any performance, though. Octane refers to ignition resistance...higher octane gas doesn't ignite as early as lower octane gas. This is really only important for engines with high compression ratios where the higher compression can cause the gas to ignite too early, before the piston is at the top of its travel. Everything is based on timing...piston reaches the top as the spark plug fires to ignite the gas. These vehicles are designed for 87 octane (85 at high altitude). When you put 93 in, the only possible effect is that it ignites LATE, robbing you of power. The computer is probably smart enough to fire the spark plug early to make up for it, though...but that still doesn't gain you anything, it just wastes money and potentially sends unburned fuel down the exhaust pipe.
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Old 04-30-2014, 03:13 PM   #5
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Yes. But pinging is VERY bad for your engine. When the fuel mixture prematurely ignites then the pistons are still on the upstroke and the resultant explosion is like hitting the top of the piston with a hammer.
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Old 04-30-2014, 04:22 PM   #6
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Mine pings a little on acceleration with 87 octane.
Not too thrilled with that...

Where'd you get yours, gapeach? I got mine at Troncalli in Cumming.
I got mine at Palmer in Roswell. I live in Cumming though.
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Old 04-30-2014, 04:38 PM   #7
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Click image for larger version

Name:	image-3702206400.jpg
Views:	170
Size:	66.6 KB
ID:	1047714 87 octane.

Edit: download the mopar companion app for your phone or tablet. It's basically the owners manual, and will give you information like this easily.
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Old 04-30-2014, 05:14 PM   #8
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Yes. But pinging is VERY bad for your engine. When the fuel mixture prematurely ignites then the pistons are still on the upstroke and the resultant explosion is like hitting the top of the piston with a hammer.
That's not pinging or more correctly called detonation. The mild detonation most people hear isn't harmful. Really bad detonation isn't heard it's felt. When that happens it's piston hammer time.

When the mixture ignites before the spark plug fires that's pre-ignition. That's not an octane issue per say. Pre- ignition on a passenger vehicle is almost unheard of. It's mostly seen in blown applications when severe detonation blows holes in piston tops and create molten hot material that auto ignites the in coming charge. Severe detonation then pre-ignition then boom. Faster than it took to read this sentence.
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Old 04-30-2014, 05:23 PM   #9
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FWIW:

Mine (2009 JKU) recently started pinging. I tried a bottle of dry gas which did nothing. I put about 12 gallons of premium fuel in it and the problem has gone away.
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Old 04-30-2014, 05:27 PM   #10
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That's not pinging or more correctly called detonation. The mild detonation most people hear isn't harmful. Really bad detonation isn't heard it's felt. When that happens it's piston hammer time.

When the mixture ignites before the spark plug fires that's pre-ignition. That's not an octane issue per say. Pre- ignition on a passenger vehicle is almost unheard of. It's mostly seen in blown applications when severe detonation blows holes in piston tops and create molten hot material that auto ignites the in coming charge. Severe detonation then pre-ignition then boom. Faster than it took to read this sentence.
Thanks for that. It goes against what I was taught as a young'un. I was also told that pre-ignition was engine run-on after the key was off. I still turn the key off in gear to this day as it does prevent engine run-on. Probably don't need to anymore with the onboard computers...lol
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Old 04-30-2014, 05:43 PM   #11
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Attachment 1047714 87 octane.

Edit: download the mopar companion app for your phone or tablet. It's basically the owners manual, and will give you information like this easily.
Thanks
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Old 04-30-2014, 06:01 PM   #12
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Thanks for that. It goes against what I was taught as a young'un. I was also told that pre-ignition was engine run-on after the key was off. I still turn the key off in gear to this day as it does prevent engine run-on. Probably don't need to anymore with the onboard computers...lol
Yea I remember cars running on after turning the key off. That was called dieseling. The dark days of the US auto industry for sure. Not pre-ignition but kinda like it. Carbon in the combustion chamber creating a hot spot, then add a carburetor jetted to run very lean for emissions all the while using cylinder head combustion chamber designs from the 60s. Remember the idle stop solenoids? When you turned the key off it dropped the carburetor linkage to a setting well below idle. That was Detroit's best way to keep fuel from continuing down the intake when the key was shut off and the engine was coming to a stop.
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Old 04-30-2014, 06:39 PM   #13
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Interesting. You're very knowledgeable on this subject and I would like to know what's really going on.

So ping is pre-ignition.
Pre-ignition is premature detonation of the fuel mixture in the cylinder (from heat was what I was told).
It is premature because the spark plug hasn't fired yet when it begins.

That much I knew, but here's what is different.

The mild premature detonation (ping) occurs when the piston is at the top of its stroke and therefore merely causes an incomplete burn of the fuel mixture resulting in reduced gas mileage and increased pollutants. (and maybe carbon buildup?)

Now bad or severe premature detonation occurs before the piston is at the top of its stroke and the controlled explosion that usually drives your piston downward is now working against your piston stroke which is still upward at this point.

Is that correct? Is the difference just in the adjective mild vs. bad (severe)? Is there a name for this bad pre-ignition?

Sorry for all the questions but I'm really fascinated by this as I've had it wrong all these years.
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Old 05-01-2014, 04:47 AM   #14
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I got mine at Palmer in Roswell. I live in Cumming though.
I had a bad experience there once ---- I work in Alpharetta. Ping me some time and I'll meet you at Chipotle on Windward or something and tell you about it.
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Old 05-01-2014, 05:43 AM   #15
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I you are pinging on 87 something is not right--it should not ping ever--the computer should prevent it. Either the gas is not the advertised octane or there is something up with the knock sensors or computer itself. Running higher octane then needed is no benefit in fact it may actually reduce your gas mileage.
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Old 05-01-2014, 07:45 AM   #16
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Originally Posted by 14Sport View Post
Interesting. You're very knowledgeable on this subject and I would like to know what's really going on.

So ping is pre-ignition.
Pre-ignition is premature detonation of the fuel mixture in the cylinder (from heat was what I was told).
It is premature because the spark plug hasn't fired yet when it begins.

That much I knew, but here's what is different.

The mild premature detonation (ping) occurs when the piston is at the top of its stroke and therefore merely causes an incomplete burn of the fuel mixture resulting in reduced gas mileage and increased pollutants. (and maybe carbon buildup?)

Now bad or severe premature detonation occurs before the piston is at the top of its stroke and the controlled explosion that usually drives your piston downward is now working against your piston stroke which is still upward at this point.

Is that correct? Is the difference just in the adjective mild vs. bad (severe)? Is there a name for this bad pre-ignition?

Sorry for all the questions but I'm really fascinated by this as I've had it wrong all these years.
I think its largely semantics if you ask me and degrees of severity. Ping = pre detonation = bad no matter how you slice it. The difference is just in how bad.

If you have detonation on piston upstroke it obviously causes a LOT of internal pressure on pistons, rods, crank, main bearings, valves etc. But even mild detonation when piston is at TDC before spark fires indicates excessive heat.

Excessive heat will destroy aluminum pistons/heads in short order, been there, done that, have the melted heads and pistons to show for it.

Im new to the jeep world but most engines have knock sensors and will retard timing in the PCM senses pinging. SOme factory forced induction engines dont because the excessive "noise" from the supercharger (for example) make the sensors inaccurate so proper tuning becomes essential.
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Old 05-01-2014, 07:54 AM   #17
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Your Jeep should not ping. It has an anti ping sensor that retards the ignition if ping is noticed. If yours is pinging, maybe the sensor has gone wrong.
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Old 05-01-2014, 08:50 AM   #18
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I think its largely semantics if you ask me and degrees of severity. Ping = pre detonation = bad no matter how you slice it. The difference is just in how bad.

If you have detonation on piston upstroke it obviously causes a LOT of internal pressure on pistons, rods, crank, main bearings, valves etc. But even mild detonation when piston is at TDC before spark fires indicates excessive heat.

Excessive heat will destroy aluminum pistons/heads in short order, been there, done that, have the melted heads and pistons to show for it.

Im new to the jeep world but most engines have knock sensors and will retard timing in the PCM senses pinging. SOme factory forced induction engines dont because the excessive "noise" from the supercharger (for example) make the sensors inaccurate so proper tuning becomes essential.
That's the way I learned it. All pinging is very bad. Thanks. I thought I was misinformed and was surprised.

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Your Jeep should not ping. It has an anti ping sensor that retards the ignition if ping is noticed. If yours is pinging, maybe the sensor has gone wrong.
My Jeep doesn't ping. Several members reported pinging with 87 octane under certain conditions like heavy acceleration, towing, or hot outside temperatures causing them to use 89 octane.
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Old 05-01-2014, 09:08 AM   #19
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I always use 93. Avoiding problems that way.
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Old 05-01-2014, 09:16 AM   #20
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Just as a heads up, "regular" and "premium" are marketing names. You will not gain any performance from a higher octane fuel. If the computer is smart enough, you won't lose any performance, though. Octane refers to ignition resistance...higher octane gas doesn't ignite as early as lower octane gas.

These vehicles are designed for 87 octane (85 at high altitude). When you put 93 in, the only possible effect is that it ignites LATE, robbing you of power. The computer is probably smart enough to fire the spark plug early to make up for it, though...but that still doesn't gain you anything, it just wastes money and potentially sends unburned fuel down the exhaust pipe.
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I always use 93. Avoiding problems that way.
But there is that.
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Old 05-01-2014, 10:48 AM   #21
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I always use 93. Avoiding problems that way.
You're wasting your money.

Just get 87, maybe 89 in the summer or when towing.
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Old 05-01-2014, 11:19 AM   #22
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You're wasting your money. Just get 87, maybe 89 in the summer or when towing.
This. Your Jeep isn't made for and doesn't need 93. Chances are you're actually getting worse gas mileage too. Of course, if it makes you sleep better at night go for it.
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Old 05-01-2014, 11:30 AM   #23
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This. Your Jeep isn't made for and doesn't need 93. Chances are you're actually getting worse gas mileage too. Of course, if it makes you sleep better at night go for it.
Exactly, higher octane fuel requires more spark/heat for efficient burn, running it in an engine not tuned for it may reduce andy chance of detonation but it also means your have a much less efficient fuel burn, less power and more unburnt fuel going out the exhaust.
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Old 05-01-2014, 11:42 AM   #24
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I realize this is a JK thread....I do have two JKs and I use what the Books say for fuel and oils....here is why...I also have an '04 TJ that I thought "needed higher octane" because it has a high flow exhaust and cold air intake...and after about 6 months the original CAT went bad...so I bought a new one....and within a year it went bad. The shop that had installed it didn't want to warranty it unless they could check timing/ ignition/ plugs etc. I knew everything was "good" as I usually stay up on maintenance and told them if they find any bad parts I will pay for it, and if not it is free. And than told them I had recently replaced plugs and springs on the coil rail...which pretty much left the computer. (such as it is on a TJ) They did replace the CAT at no charge and decided to forgo the tune-up/ check.

I told my father a retired mechanic about it and he said stop using the Premium or high octane fuel. The Jeep doesn't need it and it will run the Cat and 02 sensors. That was almost 6 years ago...still have the same CAT and exhaust....but been changing the plugs regularly.
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Old 05-01-2014, 12:16 PM   #25
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Well also currently running a 93 tune LOL
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Old 05-01-2014, 12:26 PM   #26
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Well also currently running a 93 tune LOL
You're not going to get much or any benefit out of 93 octane gas without forced induction or higher compression pistons and cam timing adjusted to match. I'm pretty sure tuning the ECU isn't going to provide any appreciable HP increase, unless you mean by 'running a 93 tune' you have done all of the other engine modifications or are running forced induction.

It's your money though.
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Old 05-01-2014, 12:32 PM   #27
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I have always ran 89 because it is plus or minus two.
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Old 05-01-2014, 12:36 PM   #28
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If it pings, try using 89 or even 93 octane. As others have said, computer adjusts amount of ignition timing it puts into engine. When it detects pinging, even slightly, it dials back the advance and saves your engine, though it does reduce hp and gas mileage a little. I would pay the extra 10 cents a gallon to feel safe. I had a '85 GLH turbo that had a 146 hp rating on reg. gas, but 150 on 92 octane. 92 octane was recommended but owners manual said 87 octane could be used in an emergency. At any rate, where you buy your gas enters into equation as well. I try to go to gas stations where there is a lot of traffic, and that means more gas delivered. The fresher, the better. I live in a small town with only 2 gas stations, and when the guy told me I was the only one buying 'super-premium' for my Mustang, I decided not to go there anymore, because that stuff probably sat in his under-ground tanks for months.
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Old 05-01-2014, 12:49 PM   #29
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I always use 93. Avoiding problems that way.
No, you're probably slowly strangling your catalytic converter though.

Edit: Well, with a tune you're not. But that just means the computer is adjusting the timing so it ignites at the same point 87 would. So again...wasting money. This engine's compression is just not high enough for a meaningful gain.
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Old 05-01-2014, 01:04 PM   #30
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Wow lots of replies, thanks. I put regular in and I'll probably continue to use that.

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