hello everyone
I need some help tuning my 2004 trailblazer 4.2
i spent a couple of days on it and its still has knock retard (KR) on stock timing it was pulling around 8 degrees until i got it to where it is right now.
down is attached my tuning file and the data log.
please let me know what i can change and if you see what i am not seeing, i am new to hp tuners. ''
Keep removing timing or use a higher grade fuel.
Also you are missing some good channels, like your o2 sensors, commanded AFR, MAF sensor.
It's hard to know how lean or rich you are requesting the fuel to be under heavy load. Could be too lean or too rich causing knock but then the other part is that we don't know if the commanded AFR is matching the actual AFR without a wideband o2 sensor.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
thank you for the information.
i dont know how to display those o2 sensors on the scanner, i can see where it says O2 but there;s no value like its not reading for some reason. i think my suv dont have a maf i just looked under the hood.
Last edited by FHD_RADO; 01-07-2019 at 03:33 PM.
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