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Discussion Starter #1 (Edited)
SuperChips,,knock sensor

I have just newly acquired the superchips cortex reprogrammer. just wondering if anybody else out there has messed with these at all or has any advice on whats the best tuner setting for my 4.8L z71. i have tuned it to the 87 octane (which felt to me it reduced power) and the performance tune mode and back to my stock mode. Seems the performance tune mode has the best overall improvements and is actually shown while driving. i was also wondering if i may have to change out my mass air flow sensor? Also with me running the Perfromance tune mode it says to run 91 octane and i just halfway filled up with 91 since i was running 87 thru it, but it keeps giving me a check engine light (code is the knock sensor) just wondering if i keep running 91 thru it, if it will end up adjusting and no longer give me the trouble code?
:neutral:
CORTEX 1.jpg
 

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With the performance tune... you should run 93 octane. Try adding a can of octane booster and see if your code goes away.
 

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remember it might take your computer a few cycles to set up to the programmer.. Give it a day or 2..
 

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Discussion Starter #5
yeah, i have been running 91 thru it since i put this on here, one person told me that the code comes on due to the fact of that electrical wire that senes the knock gets wet and may ruin the wiring and thats why i keep getting it. its only when i really get on it also that the light comes on,,thanks for the input guys!!!!:great:
 

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I'm thinking if you did not get the trouble code before the new tune... then it not a wiring problem. My guess is not enough octane. Especially since you say you get it when you put you foot into it... that is where it would knock when under load. Like I said put some octane boost in or try rolling it back off to stock and see if it goes away. You really do not want to run it much if its knocking as it can damage the engine over time.
 

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Discussion Starter #7
yeah i was wondering if it would damage the engine or what if it keeps giving that sensor,, i will try some of the octane booster like you said. it had given me the code only like once or twice before but it would go off after a bit of driving. if it keeps doing it im probably gonna just reset it back to stock,or stock with options.
 

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Is this a common occurrence I wonder? I will be looking to get a tuner hopefully pretty soon and don't want to have any issues like this myself.
 

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Is this a common occurrence I wonder? I will be looking to get a tuner hopefully pretty soon and don't want to have any issues like this myself.
There are allot of benefits with adding a tune... they do allot of things like advance the timing, fuel mixture, shift points etc. Many have guidelines with regards to minimum octane requirements for settings such as stock, sport and performance. I have bad two tuners over the years... bully dog and a diablo trinity. Both have worked well... but my diablo has more options with regards to custom tuning. I would highly recommend diablo to anyone looking a tuners.
 

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I really want the Diablo Trinity with a custom tune package but not sure if finances will allow that anytime soon unless I get some pretty good sized side jobs in the near future
 

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Discussion Starter #12
So I have run 91 through it and a can of octane booster and it still has been giving me this code p0332
Low voltage knock sensor bank 2,, any ideas. ?
 

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Next things would be faulty knock sensor or bad wiring to the sensor.
 

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Discussion Starter #14
Yeah thats what im thinking,, and have been told that as well I heard its a pain to change out,, its just weird I started getting it when I went mudding one day and after cleaning up on the engine, , but it stopped for a bit then I kept getting it after the tune..i guess probably because the fuel air mix is different and its picking it up faster or what idk? But I went mudding just yesterday and you can deff feel the performance tune doing its job when you hit that skinny pedal, , so I would like to keep it on there. Suggestions timtom
 

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I wouldn't remove the programmer... I do not believe you are getting any knock and will not as long as you continue to run the correct octane. Your issue is with the sensor itself and do not feel due to an actual knock... and just giving you the dummy light. My first thing would be to check the connector for that knock sensor... maybe you will be lucky and just a dirty or loose connection.
 

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Discussion Starter #16
Thank you sir, well said..guarantee is the sensor I have heard chvy is notorious for that kind of thing
 

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Discussion Starter #17
So after running the octane booster and driving for a bit now I do actually hear a knock I will just be tooling down the road and I will hear a loud knock knock knock noise just for a moment, , then it stops and the cheeck engine light will come on, , but the engine doesnt choke out or anything, , it just makes that loud knock sound for a moment and then stops I have checked everything cant figure it out,, is a 4.8L supposed to just run 87octane or what,? I doubt it would be the gas tho, , changing out the sensor tomoroz see if that fixes it
 

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Have you tried rolling the tune off or to a lower performance option? Many have them listed by required octane...87, 89, 92.

There is only a minimum octane rating... usually 87. You can run any octane you want. The primary reason to run higher octane is reduce predetonation of the fuel (knock). There are several conditions that can cause it... higher compression, older engines (carbon build up), advanced timing, hauling heavy loads, etc.

I have never had a knock sensor go... so I can not tell you what if any impact it would have.
 
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