Engine Pinging/Detonation

[royceda59832]

I have been noticing engine pinging/detonation/knock for the past month or two - it happens under *light* acceleration in higher gears (6/7/8) when rolling on to the throttle. Most noticeable at about 40mph in 7th gear, when I go from coasting to accelerating. It will occur with similar frequency when the truck is completely unladen as when towing.

If I manually shift to a high gear and try lugging the engine, it does not occur. It is only in the specific light acceleration profile scenario mentioned above - which, unfortunately, is a common scenario while driving. Gasoline is 87 octane and the problem is irrespective of fuel station (tried Marathon, Speedway, Costco, etc). Upgrading to mid-grade or premium fuel is not a solution - the gas V6 in the truck is rated to run on 87 octane.

To what extent will the dealer or Jeep Wave cover a rental car if the dealer needs to keep the truck for a few days? I know the Jeep Wave says it covers "Same-Day" rentals, but I don't want to be car-less for several days if that becomes necessary. I also don't want to take it in, have them tell me they "can't reproduce the issue," and drive off with it again with no fix - only to have to waste my own time bringing it in again at another time.

Sponsored

 

[hjdca]

Unfortunately, you are running "inexpensive/cheap gas". Personally, I believe that contributes to the pinging with 87 octane. You can try 87 octane Chevron to see if it pings with better gas...

PS. Techron in Chevron gas is an excellent additive that keeps your engine clean. If you run it all the time, you do not need fuel injection cleaner.

 

[royceda59832]

Unfortunately, you are running "inexpensive/cheap gas". Personally, I believe that contributes to the pinging with 87 octane. You can try 87 octane Chevron to see if it pings with better gas...

This is exactly the response I expected to receive from this forum, thanks.

 

[sass JT]

To answer your questions... I cannot. I’m not that highly trained to fix said issues or experienced in dealer loan vehicles ... with that said.

IMO, you need to get ahold of your dealer or @JeepCares to figure out the details before taking it in, if they are willing to give you a rental or not... I would also ask about having a technician ride with you and you point out what you hear at the time your experiencing your issue.

I know my dealer is willing to work with me but unknown if your dealer you would take it to will do for you.
Good luck.

 

[JeepCares]

I have been noticing engine pinging/detonation/knock for the past month or two - it happens under *light* acceleration in higher gears (6/7/8) when rolling on to the throttle. Most noticeable at about 40mph in 7th gear, when I go from coasting to accelerating. It will occur with similar frequency when the truck is completely unladen as when towing.

If I manually shift to a high gear and try lugging the engine, it does not occur. It is only in the specific light acceleration profile scenario mentioned above - which, unfortunately, is a common scenario while driving. Gasoline is 87 octane and the problem is irrespective of fuel station (tried Marathon, Speedway, Costco, etc). Upgrading to mid-grade or premium fuel is not a solution - the gas V6 in the truck is rated to run on 87 octane.

To what extent will the dealer or Jeep Wave cover a rental car if the dealer needs to keep the truck for a few days? I know the Jeep Wave says it covers "Same-Day" rentals, but I don't want to be car-less for several days if that becomes necessary. I also don't want to take it in, have them tell me they "can't reproduce the issue," and drive off with it again with no fix - only to have to waste my own time bringing it in again at another time.

@royceda59832
We certainly regret to hear that you are having concerns with your Gladiator. We would be happy to escalate your situation to a specialist whom will assist you during your dealer service. Your case manager will also be able to offer potential assistance with your loaner vehicle request, as loaner vehicles are independently provided by our dealers. Feel free to send our team a private message once you have a dealer appointment scheduled and we will be happy to assist.

Kathryn
JeepCares

 

[Kaviiak]

@royceda59832
We certainly regret to hear that you are having concerns with your Gladiator. We would be happy to escalate your situation to a specialist whom will assist you during your dealer service. Your case manager will also be able to offer potential assistance with your loaner vehicle request, as loaner vehicles are independently provided by our dealers. Feel free to send our team a private message once you have a dealer appointment scheduled and we will be happy to assist.

Kathryn
JeepCares

Mine has a ping around 30mph low throttle(off idle)

 

[JeepCares]

Mine has a ping around 30mph low throttle(off idle)

Have you notified your servicing Jeep dealer about this? Please send our team a message if you are in need of support while in service.

Darlene
Jeep Cares

 

[Kaviiak]

Mine pings around 30mph idle to mid throttle. Tried 92 octane but didnt help(or didn't help much)

 

[BLK HOLE]

Mine is in the dealer for it now, for the 3rd time. Each time they tell me it is fine. Sucks.

 

[hjdca]

For gas mileage and efficiency, when you are cruising with the JT on the hwy, the computer advances the timing, so, the combustion chambers can keep the JT going very efficiently.... As you lay on the gas and start pushing the motor, the timing gets retarded, so, that it does not detonate or ping. Pinging or detonation at full throttle is much different that pinging at light throttle while cruising. I have not heard of pinging or detonation of a JT at full throttle, only in light throttle conditions in this forum. For gas mileage purposes, cruising timing is probably really high, so, any decrease in gas quality or octane, could be heard as light pinging at cruise in a hwy gear. This may also be exacerbated by increasing the rolling resistance, which requires more horsepower to keep the speed up, so, ---- add more resistance, add summer temps, add questionable quality gas, maybe a Mass air meter that is slightly aggressive, then, maybe you will get some pinging.

It could be a computer issue/spark issue, where the timing is higher than it should be at cruise, it could be identifying a gas quality issue.... etc.... The Mass air meter is helping make all these calculations at cruise, so, I would also have the dealer check that the mass air meter is generating the right voltage.

PS. I run mid-grade 89 Chevron in mine since I bought it and I have not heard any pinging yet.

 

[P.Lo]

Don't know if this is your "ping" problem or not, but I have only run premium gas in my JT since day one.
No "pinging" or CEL!!!!

 

[Kaviiak]

I have tried premium. After 2 tanks i figured the dodge/jeep dude that responded probably knew more than me.
It still pings but only under isolated conditions(flat low throttle). I honestly haven't floored it. I forgot it is a 285 hp v6. I drove a 235hp v8 for 6yrs in a 72 chevy half ton and did tons of burnouts when i was 16. This isnt like my old chevy.
I'm so new and ignorant.
My chevy life had me jam a 420hp 383 stroker in a 72 half ton. I felt like a king til someone smashed it parked.
This is efi. It is new for me. I mentioned(bitched/complained). Seems a pro straightened me out. Let this thing have a minor ping and enjoy the a/c. Good emissions quiet sweet friken ride. I love my Jeep.

 

[Mr._Bill]

I have no issues with mine. I burn 87 octane from Sam's Club.

 

[wannajeep]

I recently started hearing knocking/pinging on my manual transmission Rubi. It happens only at or below 2K RPM, typically when I start rolling on the throttle right after a gear change.

This doesn't surprise me too much, as I've found the Pentastar V6 prefers the RPMs to be a little higher. I'm adapting my driving style to run in slightly higher RPMs now and will also try 93 octane after I run this tank down, and see if it helps. Never seems to happen at higher RPMs.

 

[ShadowsPapa]

I have no issues with mine. I burn 87 octane from Sam's Club.

And you should not. Octane is octane. It can't easily disappear. It's the cleaning agents, detergents and so on that help keep engines clean, help prevent gum, varnish, etc.
Octane is the restance to self-ignition. PERIOD. Nothing more, nothing less.
Higher octane gas does not burn faster or slower, nor does it contain fewer BTUs (unless the higher octane is due to ethanol, as it is higher octane with lower BTU content per gallon)

Cheap 87 octane is the same octane as other "not cheap" octane.
We've hammered the hell out of this on our AMC forum when guys build high-compression engines, or have detonation issues.

These engines are made to resist detonation in multiple ways - keeping up the turbulence of the incoming air stream, quench, timing, mixture, heat control and fast-burn chambers.
I've had 3 vehicles over the last 5 or 6 years that were pinging and the resolution was making the engine run cooler- they each were developing hot spots for various reasons. I guess I could include a 4th - my brothers car, oh, and a 5th - his Jeep - both had bad radiator caps and were not holding pressure.

If there's pinging due to detonation (and not pre-ignition) then the dealer should check into it for one thing.
Otherwise, some may be caused by lugging - these won't handle that well and it would appear it's happening with manual transmissions - keep the RPM up. There's not time for detonation with higher RPM for one thing.
I can lug the heck out of both of my 4.0 equipped vehicles and not get any detonation - there's a sensor that kicks timing back if the sonic wave of detonation is detected.

Octane facts:
Octane is not lost when gas is stored in sealed containers. IF they aren't sealed, the light parts evaporate - but it takes a very long time for octane to be impacted.

Higher octane gasoline does not burn slower or produce less power. It's formulated with longer molecules to resist self-ignition.

Detonation is caused when the pressure and HEAT caused by the spark-ignited flame front shoves unburned fuel into a corner to the point it ignites and sets off another flame front - the two collide and it's a sort of a "Sonic boom" that causes the "ping".
Slower RPM detonations easier as it takes TIME to squash that unburned fuel to that point, higher RPM means there's not enough time. That's one reason race engines don't easily detonate - HIGH RPM.
Heat adds to the troubles.
Over-advanced timing does as well as it ignites the mix earlier giving more time for the burning fuel's flame front to shove unburned fuel "into a corner" resulting in self-ignition.
Lean mixtures burn hotter - and can also cause detonation.

I run WALMART fuel in my Javelins (well, I did in the 70 before I sold it)
It was far more happy on Walmart fuel than any other fuel around. Pinging reduced, performance increased as I could run timing where it belonged.
My 73 also does very well on WalMart fuel.

Sponsored