knock sensor code and 4*knock!! HELP
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 355
Likes: 0
From: Cape Coral,FL
knock sensor code and 4*knock!! HELP Yes, i got both codes on the knock sensors, low bank 1 and 2, so i replaced the knock sensors, and whoo la, still comes back along with the 4* knock, im down and out, i dont know what to do!
I recently relocated my coils and now have a weird noise coming from the tranny/ds area i havent got to look at yet, just for some background, i could maybe think up some possiblities for the knock, but the sensor codes again have me baffled!! Anyone with a tadbit of info help me! I want to just shut off the sensors! The knock of coarse comes anytime i press down on the peddle, like more than 50% throttle, and the knock goes from 0-4 and stays there...
any help, suggestions, and questions are all wanted, thank yoU!
I recently relocated my coils and now have a weird noise coming from the tranny/ds area i havent got to look at yet, just for some background, i could maybe think up some possiblities for the knock, but the sensor codes again have me baffled!! Anyone with a tadbit of info help me! I want to just shut off the sensors! The knock of coarse comes anytime i press down on the peddle, like more than 50% throttle, and the knock goes from 0-4 and stays there...
any help, suggestions, and questions are all wanted, thank yoU!
Re: knock sensor code and 4*knock!! HELP your wiring harness to the sensors is unplugged or gone bad.. the 4* of knock the computer does automatically when this is not functioning correctly.
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 355
Likes: 0
From: Cape Coral,FL
Re: knock sensor code and 4*knock!! HELP
I bought my wiring harness at the dealership. I had to splice (solder) the two pigtails into the stock harness.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Addict
Joined: Jun 2002
Posts: 2,428
Likes: 0
From: Las Vegas, NV
Re: knock sensor code and 4*knock!! HELP I had the exact situation as you (both KS codes), twice actually. The first time it was the wiring harness (part # 15372170); the second time it was burnt KS pins on the pcm.
Before you pull your intake, do a visual check of the pcm first. I forgot the pin numbers for the knock sensors, but there's a schematic in the Helm's manual, and probably one floating around here, or ls1.com. Good luck!
Before you pull your intake, do a visual check of the pcm first. I forgot the pin numbers for the knock sensors, but there's a schematic in the Helm's manual, and probably one floating around here, or ls1.com. Good luck!
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 355
Likes: 0
From: Cape Coral,FL
Re: knock sensor code and 4*knock!! HELP Wow, good info predator! Ill look around for it! How did you fix the ks pins? How did you see it was burnt? just check the voltage?
TECH Addict
Joined: Jun 2002
Posts: 2,428
Likes: 0
From: Las Vegas, NV
Re: knock sensor code and 4*knock!! HELP I went to the pcm pins schematic and located the pins for the knock sensors; I looked at them on the pcm and saw that they were black and burnt looking. Then I just barely touched the pin and it broke off. I had to buy a new pcm and have it flashed. I think it was $200.00. I sent my core pcm to Lyndon Wester and he sent me a new one with the leatest GM flash. If you find that your pcm is hosed, email Lyndon (Wester's Garage): nwester@eidnet.org. He'll take good care of you.
Re: knock sensor code and 4*knock!! HELP if you get water under your intake from say excessive pressure washing it can short both sensor wires and fry the harness or the pins on the pcm. hopefullly you can just by the pigtail from a dealership as above. there is a service bulletin from gm about this problem and i thik the fiz was to put grease on them or silicone or something like that so water couldnt get to them again
TECH Addict
Joined: Jun 2002
Posts: 2,428
Likes: 0
From: Las Vegas, NV
Re: knock sensor code and 4*knock!! HELP That's exactly correct Dave. I know from experience, too
. And yes, GM does have a TSB for waterproofing the knock sensors by laying a bead of silicone around the rubber boots, and removing the foam under the intake.
. And yes, GM does have a TSB for waterproofing the knock sensors by laying a bead of silicone around the rubber boots, and removing the foam under the intake. TECH Addict
Joined: Jun 2002
Posts: 2,428
Likes: 0
From: Las Vegas, NV
Re: knock sensor code and 4*knock!! HELP I hope I haven't given the wrong impression with the pcm digression. I'm 99% sure it's just the wiring harness, but for that 1%, it can't hurt to just check the pcm before pulling the intake.
Good info, Dave, you nailed it.
Good info, Dave, you nailed it.
TECH Fanatic
Joined: Feb 2002
Posts: 1,640
Likes: 0
From: Austin, Tx.
Re: knock sensor code and 4*knock!! HELP It's easy. You disconnect the knock sensor harness from the main wring harness near the firewall. Just disconnect the connector. Then you will have the knock sensor harness in your hand. Measure the new wires against the old and cut and replace. I reused the sleeves and clips from the old harness. Once you get the harness off the car, you'll see what to do, it's simple.
