Normal knock retard on l92?
Normal knock retard on l92? I have an 2007 Yukon Denali and I used my torque app to see what truck was doing since I haven't played around with the app in a while. I have stock tune on it. With ac on while cruising I was getting knock the whole time on the five mile trip ranging from 0.1 up to 4.7 degrees while cruising. Is this normal? Iat was 97 degrees on the highway. Temp outside is 91 degrees. When going up hills is knock retard normal on these trucks that much? Even when on flat roads with the AC on?
I wanted you add that my truck knocks after it warms up then after a drive down the street it stops knocking. Not piston slap. This is a very deep knock. I've put about 15k miles on it since then in a year. I'm sure if it were something serious the engine would've let go a long time ago. I've been all in deep texas and lousiana. Makes great power.
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If it helps i screen recorded what i go through. Just want to know of this is normal. I was in the middle of an three hour trip going 80mph at 2000 rpm. Again this is an 2007 yukon denali. Turn volume down
https://drive.google.com/file/d/1iyd4iLqBMJ_GG8Jn_0Ar3HXNy1viw2xt/view?usp=drivesdk
https://drive.google.com/file/d/1iyd4iLqBMJ_GG8Jn_0Ar3HXNy1viw2xt/view?usp=drivesdk
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I'm still a bit new to the GM stuff but from my understanding 4 degrees of ignition retard is still in the acceptable range. Although I will agree that 0 would be better. You would expect to see some KR value if you were running regular fuel, but premium should prevent that.
I supposed it's possible that your MAF is dirty and reporting lower airflow than actual. This would definitely cause the system to pull timing. Do you have HP Tuners? Can you force the car into SD mode and log again?
If not, I suggest trying to clean the MAF with sensor safe cleaner.
I supposed it's possible that your MAF is dirty and reporting lower airflow than actual. This would definitely cause the system to pull timing. Do you have HP Tuners? Can you force the car into SD mode and log again?
If not, I suggest trying to clean the MAF with sensor safe cleaner.
Clean maf is cheap and fast. Id follow that up with a new fuel filter and maybe even get injectors cleaned and flowed. These engines are fairly high SCR and the pistons are large so theres not a lot of room for meh when it comes to your air fuel set up so if any of the components fall out of range this sounds normal to me. So long as the ECM is pulling timing and your not hearing any actual knock its probably pretty safe. Its hard to keep these things running as new. My old GMT800's are always pulling timing nowadays. Still run good though, just not all that fast anymore
I'm still a bit new to the GM stuff but from my understanding 4 degrees of ignition retard is still in the acceptable range. Although I will agree that 0 would be better. You would expect to see some KR value if you were running regular fuel, but premium should prevent that.
I supposed it's possible that your MAF is dirty and reporting lower airflow than actual. This would definitely cause the system to pull timing. Do you have HP Tuners? Can you force the car into SD mode and log again?
If not, I suggest trying to clean the MAF with sensor safe cleaner.
I supposed it's possible that your MAF is dirty and reporting lower airflow than actual. This would definitely cause the system to pull timing. Do you have HP Tuners? Can you force the car into SD mode and log again?
If not, I suggest trying to clean the MAF with sensor safe cleaner.
Clean maf is cheap and fast. Id follow that up with a new fuel filter and maybe even get injectors cleaned and flowed. These engines are fairly high SCR and the pistons are large so theres not a lot of room for meh when it comes to your air fuel set up so if any of the components fall out of range this sounds normal to me. So long as the ECM is pulling timing and your not hearing any actual knock its probably pretty safe. Its hard to keep these things running as new. My old GMT800's are always pulling timing nowadays. Still run good though, just not all that fast anymore