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fadhil wrote:i have 2008 Yukon Denali and i still have sound of pinging even if fall my tank with 93oct if i use performance tune thant i chose 93 oct i will hear the pinging if i chooce the other tuning there is no pinging sound also after log and the 0.0 it still the pinging

sounds like some rocks rattling around in a tin can

if i use 85 oct tunig or factor tuning no painging

but i i use preformace tuning even after I adjust the injector & wot

can please answer me what is the problem

fadhil wrote:i have 2008 Yukon Denali and i still have sound of pinging even if fall my tank with 93oct if i use performance tune thant i chose 93 oct i will hear the pinging if i chooce the other tuning there is no pinging sound also after log and the 0.0 it still the pinging

sounds like some rocks rattling around in a tin can

if i use 85 oct tunig or factor tuning no painging

but i i use preformace tuning even after I adjust the injector & wot

can please answer me what is the problem

then it sounds like you are not using a high enough octane gas with the performance tune...

the gas you are using with the performance tune is too low of an octane, and the timing/spark advance in the performance tune is too high for it...

you either need to use a higher octane gas in your truck, or use the lower octane tune.

Just an update that I am still looking at this. I decided to try fuel from a different station. I found out that the 93 octane BP is 10% ethanol even though its not displayed below the octane sticker on the pump. They recently added the 10% stickers to the pumps and now I'm concerned its the fuel. I am trying to run this tank down and am searching for a 92 octane pure gas to put in.

I'll post more logs once i am sure I have run the fuel out and have filled up with something different to review before i make any changes.

WELL..???? i am curious how its going as i as experienceing the exact same sounds....and yes..it is k.r. plain and simply too much timing advance on the performance tune. in my non expert opinion,

I have a U7194 on order for my 07 Denali so I am interested too.

Can't you just modify the current tune to back off the timing a degree or 2?

bizzady bump