So, I did the typical repair,
New AC DELCO OEM knock sensors and short harness. Cleaned everything up, had water in back port, did the TSB related work, adding circular dams of silicon. Torqued properly. The truck has not seen rain or any other water since repair…
I drove it around town about a month and thought I was home free. But NOPE. I hooked up my boat and hopped on interstate for a 450 mile run…about 2 miles down highway the light came on, codes 332 & 327! I had my code reader, reset it about 3 of 5 stops along the way, sometimes I could run 150 miles (2.5 hours) with no code. Since I have returned, it throws codes every time I drive it.
I have checked connections, fuses, etc.
the truck runs great, 160k 2001 5.3 silverado extra cab…all stock.
I am going to test the voltages, got questions.
what’s the normal reading/range?
does a knock cause a high or low reading?
I am 99% sure my codes are LOW voltage…so maybe a bad ground?
The one issue I have that I wonder if it’s causing a knock reading?? A Few of my fuel injectors are really noisy, very audible in the cabin of the truck. I mean so loud it sounds like a diesel engine, a normal person would think my truck is diesel powered. I know it’s the fuel injectors, I used a stethoscope to go over the entire engine, the only place I picked up the sound was on fuel rail and injectors….super quiet everywhere else. Just trying o rule things out, my injectors sound like a badly knocking engine….
So how does a knock sensor work, does it just pick up rattlle or knock, change voltage to tell the computer to adjust timing air fuel to eliminate the knock? Is a knock a drop or increase in voltage?
I have also seen the sensor relocation kits, anyone have success with that or other solutions????
I would ignore this but in GA they will fail my annual inspection and refuse to renew my tag….
New AC DELCO OEM knock sensors and short harness. Cleaned everything up, had water in back port, did the TSB related work, adding circular dams of silicon. Torqued properly. The truck has not seen rain or any other water since repair…
I drove it around town about a month and thought I was home free. But NOPE. I hooked up my boat and hopped on interstate for a 450 mile run…about 2 miles down highway the light came on, codes 332 & 327! I had my code reader, reset it about 3 of 5 stops along the way, sometimes I could run 150 miles (2.5 hours) with no code. Since I have returned, it throws codes every time I drive it.
I have checked connections, fuses, etc.
the truck runs great, 160k 2001 5.3 silverado extra cab…all stock.
I am going to test the voltages, got questions.
what’s the normal reading/range?
does a knock cause a high or low reading?
I am 99% sure my codes are LOW voltage…so maybe a bad ground?
The one issue I have that I wonder if it’s causing a knock reading?? A Few of my fuel injectors are really noisy, very audible in the cabin of the truck. I mean so loud it sounds like a diesel engine, a normal person would think my truck is diesel powered. I know it’s the fuel injectors, I used a stethoscope to go over the entire engine, the only place I picked up the sound was on fuel rail and injectors….super quiet everywhere else. Just trying o rule things out, my injectors sound like a badly knocking engine….
So how does a knock sensor work, does it just pick up rattlle or knock, change voltage to tell the computer to adjust timing air fuel to eliminate the knock? Is a knock a drop or increase in voltage?
I have also seen the sensor relocation kits, anyone have success with that or other solutions????
I would ignore this but in GA they will fail my annual inspection and refuse to renew my tag….