STOP using cheap gas!! With the add-ons on your motor nothing less than 91 oct should be in the tank.Either pump 91 or oct boost.Those instruction were included in the box of instructions.Read the print................

 

But that doesn't make Seanad, I had three different tune levels, 87, 91, and 93 octane and I'm currently running the 87 octane and all I have besides that is the air gap.

I even tried 93 and didn't notice a difference in the amount of pinging.

 

If possible,try to find pumps that are 100% gas,,No corn mix or flex fuel crap.If you can,find race shops and buy some 100 oct fuel,fill the tank,go for a cruze to clean the system.At speed ,kickdown for passing gear,listen for responce .If its better remember the oct rating andbrand.Just a thought...................

 

There's really no basis for the "alcohol is evil" argument at all. In the context of this thread: ethanol inhibits pinging and does dead zero harm to the fuel system.

If'n it were mine, I'd be on the factory tune for troubleshooting and NOT driving the thing.

 

Would that much octane maybe hurt my motor?

I wish I had the option to not drive it, but to be honest I have been driving it like this for about 10-15k miles and no issues.

 

That high octane won't hurt your motor, but, it won't really help either. Going back to the stock tune may not be a bad idea..... see how it runs.

 

Gotcha, I might have to. I did that a while back and it was just such a dog.

I know pinging is bad, but what can it actually harm? Tops of pistons? Valves?

 

Nope, not at all. Running a higher octane than you need in most cases only costs you money you didn't need to spend and robs you of some power. It doesn't hurt anything but the fun of mashing the pedal.

 

It can break pistons (melts holes in the domes, cracks weak rings) and it's hard on the wrist pins and rod bearings.

 

Hmm not good, I wish I put my 1995 2500 5.9l v8 on the road before my road trip to Maine this weekend, just did 4.10 gears in my 1500 hoping to ease the pinging of the motor a little bit.