shakenfake

Bought some VP madditive octanium and poured it in. I will note here that today when I went to check the codes that only one knock sensor was activated, bank one. Leads me to believe that maybe the harness and sensors are good and I got some dookey fuel

dantheman1540

Got the bottle with the flames my man! Should have bought a 12pack, more is bettererer

shakenfake

I was cringing at that $20 for 10 gallon treatment but screw it better than replacing knock sensors

RedXray

I'd like to try the ACES IV octane booster 32oz treats 192 gallons. 80$ sounds pretty expensive but it will treat 5.3 26gal fuel tanks so about 15$ a tank. It doesn't use MMT that builds orange deposits on the plugs & valves.

BND Automotive

My plugs after using Boostane with MMT

shakenfake

Damn looks like they rusted out or something haha

I did pull a plug just to see if I could find the source of my hard starts but it looks better than new so just plugged it back in

shakenfake

Couple days later update, drove 70-80 miles over the weekend no code which is double the mileage before it popped the other times. Drove 12 miles yesterday to work and pop. Do I really have knock? I feel like this is going to be one of THOSE issues

dantheman1540

DId you replace the harness or sensors yet? sounds like that's more likely to me.

shakenfake

All of them have less than 5k miles. Every time the codes pop they have been different as well. The first time it was codes for both knock sensors the second time it was just for the first one.


edit: have not had a chance to check out the codes that popped yesterday will do that today after I get back home

dantheman1540

something making contact with the frame causing false knock?

RedXray

Hard to say if it's real knock without seeing it on a scanner. You've done the booster with little or no change but without seeing whats going on in the tune you're kinda blind. Camshafts and headers can cause the sensors to hear noises the PCM interprets as knock. Anything that's rattling like an exhaust pipe hitting the chassis etc. The sensors are like microphones and on some builds the tuner will desensitize the sensors to avoid false knock and keeping the PCM from pulling time.

Knock looks like stair steps on HP Tuners VCM scanner. False knock looks smooth then you see one random spike here and there on the graph, not the stair step that's common with real knock. False can happen at idle, during shifts or even bumps or rough roads causing exhaust systems or other components to bang or rattle around. I've desensitize the sensors in my tune after doing the octane booster with no change on the scanner which indicates false knock. The spark plugs tell where the timing is, high or low and the porcelain shows tiny black specs when knock is present. You can use a 5/8 hole saw and cut the metal away from the porcelain for a much better view during plug read. I'd replace with AC Delco sensors and most use the Dorman harness to save a couple bucks, don't forget new intake gaskets.