I installed the Flashpaq with the 87 tune and now I get pinging under heavy acceleration. Anyone have something similar? Fixes? Its a 09 auto.

 

I too experienced the pinging running the 87 octane tune...I thought with computerized vehicles, the knock sensor/computer would automatically adjust the timing to eliminate the pinging, but for my JK that was not the case...I switched to a higher octane 91 and the JK hasnt been pinging since....With the high price of gas, it may not be the solution you wanted to here...Other members should be chiming in soon with their recommendations...

 

The PCM relearn process can take a little while, especially if you suddenly change your driving habits. What has worked for me is a few on/off cycles with a couple freeway onramp blasts. The PCM relearn process can take as long as 40 on/off cycles and for some it has taken more than a couple tanks of fuel.

Pinging/knocking is never good although when you are right on the edge of pinging is where you make the most power. I would give it a bit and try to incorporate some on/off cycles while you're sitting at a red light or in traffic. The knock sensors can only retard the timing so much and if it persists, I would try mixing in a few gallons of higher octane until it subsides.

Also, anything else on your JK? CAI, exhaust or headers? Perhaps a damaged AIT sensor? If it was really off, you would be running in limp mode.

 

The flashpaq is messing with the ECU maps, so that is something you will have to deal with. There is no learning for knock. Your symptoms are the reason I dont trust these things.

 

The PCM and collection of sensors are largely dynamic with some mapped components. Most certainly the O2 sensors and knock sensors do adjust for lean conditions which cause pinging or knocking.

Ny choice for dealing with lean conditions, which are by no means only related to programmers, is slight bumps in octane. From there colder plugs, but I'd still need to be a couple tanks into the changes I made before I give up on the PCM relearn process.

 

I have been running the 87 octane on my 09 automatic for almost a year now and have never had any pinging or knocking.......???

 

87 octane with the Superchips Flashpaq 87 tune setting?

 

I noticed this on mine too, its a 2009 auto. I rarely get on it too heavy, but a couple weeks ago I did plant my foot to the floor to merge onto the highway and heard the pinging as I got near redline (I was driving next to a concrete wall which helped). I put 89 octane gas in on the next fill-up, which seemed to help as expected. The cost difference between standard and mid-grade gas is nominal. This is really the only thing you can do, unless you just had a tank of "bad gas".

 

Right, poster doesn't specify if both the tune and the fuel are 87 octane.

Note that both posters reporting knock are at or near sea level. Significant?

Question: How do you tell if you're getting knock? Is it audible or do you have to look at the data logging. If data logging, what variables, what ranges, etc?

 

Is it audible for sure. It sounds like you're shooting a slew of bb's at a tin pan is the best that I can describe it.