knock sensor
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
Re: knock sensor (6spd)
I only disconnect my knock sensor @ the dragstrip. On my 87 it doesn't hurt anything. On my friends 92 f-body it throws a code 43 immediately and runs poorly. I plug my 87's back in before the ride home. I don't know what the car would do if left unplugged. Im sure someone will chime in and explain. :crazy:
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: knock sensor (6spd)
Mine is disconnected. It has been for several years. Are you disconnecting the ESC when you're checking the base timing? How do you come up with:
RACE ON!!!
...20 degrees of knock retard at 2000 rpms.
Race Director
Joined: Dec 1999
Posts: 11,182
Likes: 2
From: Almost all Skyline Cruises Vettes at Waterside 1-5
Cruise-In I Veteran
Cruise-In II Veteran
Cruise-In III Veteran
Cruise-In IV Veteran
Cruise-In V Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: knock sensor (6spd)
i diconnected the wire to the knock sensor now i have 20 degrees of knock retard at 2000 rpms. i thought these can be diconnected???
Threw an ESC FAILURE code and I frove home from Fla in Limp home mode.
If you are disconnecting because you are getting a lot of false knocks and therefore retard, try replacing the ESC with a NAPA ESC 209. They are les sensitive to noise.
:seeya
:steering:
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: knock sensor (jackdaroofer)
Jack,
If you got a code, maybe it was because the loose wire grounded. A code will set if the if the ECM sees low voltage for too long. The knock sensor grounds that circuit when it detect knocks. If your connector was grounded for too long, that could have caused a code. Mine has been disconnected for years... No codes.
6spd,
When you check your base timing, you need to have the ESC wire disconnected. When you are through, you need to disrupt the power to the ECM, to clear codes.
RACE ON!!!
[Modified by CFI-EFI, 6:24 PM 2/28/2004]
If you got a code, maybe it was because the loose wire grounded. A code will set if the if the ECM sees low voltage for too long. The knock sensor grounds that circuit when it detect knocks. If your connector was grounded for too long, that could have caused a code. Mine has been disconnected for years... No codes.
6spd,
When you check your base timing, you need to have the ESC wire disconnected. When you are through, you need to disrupt the power to the ECM, to clear codes.
RACE ON!!!
[Modified by CFI-EFI, 6:24 PM 2/28/2004]
Race Director
Joined: Dec 1999
Posts: 11,182
Likes: 2
From: Almost all Skyline Cruises Vettes at Waterside 1-5
Cruise-In I Veteran
Cruise-In II Veteran
Cruise-In III Veteran
Cruise-In IV Veteran
Cruise-In V Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: knock sensor (6spd)
:cheers: The best solution seems to be to replace the ESC module with the ESC 209. Gorden Killebrew, the guru of C4's recommends that! The stock vette ESC module is too sensitive to false knocks, headers are a particular problem
The ESC module is a simple swap, it is screwed to th e heater housing on the passenger side
:seeya
:steering:
The ESC module is a simple swap, it is screwed to th e heater housing on the passenger side
:seeya
:steering:
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: knock sensor (jackdaroofer)
:cheers: The best solution seems to be to replace the ESC module with the ESC 209.
The ESC module is a simple swap, it is screwed to th e heater housing on the passenger side
:seeya
:steering:
The ESC module is a simple swap, it is screwed to th e heater housing on the passenger side
:seeya
:steering:
Basically, I agree. In MY situation, I tested with 93 octane gasoline and base timing set at 0. I was getting knock counts, revving it in neutral. My long block is all stock, never disassembled. No headers, either. Now, I run 14* base timing on 85 octane gasoline. No knock... No counts.
RACE ON!!!
Race Director
Joined: Dec 1999
Posts: 11,182
Likes: 2
From: Almost all Skyline Cruises Vettes at Waterside 1-5
Cruise-In I Veteran
Cruise-In II Veteran
Cruise-In III Veteran
Cruise-In IV Veteran
Cruise-In V Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: knock sensor (6spd)
:cheers: No, you are not changing the knock sensor, you are changing the ESC module that interprets noise and sends it to the ECM!
If you oreder NAPA ESC 209, you will see the whole thing
:seeya
:steering:
Jack
If you oreder NAPA ESC 209, you will see the whole thing
:seeya
:steering:
Jack
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: knock sensor (6spd)
Like Jack said, the module on the side of the blower motor housing, not the sensor, itself. Check the "Tech Tips" and maybe that will make it more clear.
RACE ON!!!
RACE ON!!!
Race Director
Joined: Dec 1999
Posts: 11,182
Likes: 2
From: Almost all Skyline Cruises Vettes at Waterside 1-5
Cruise-In I Veteran
Cruise-In II Veteran
Cruise-In III Veteran
Cruise-In IV Veteran
Cruise-In V Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: knock sensor (6spd)
i checked napa did not show it?? also i didn't know 91's came with the module.
Sorry for the bad info, and also sorry for lack of better info
:seeya
:steering:
Thread Starter
Burning Brakes
Joined: Jun 2003
Posts: 949
Likes: 0
From: smithtown ny
Re: knock sensor (jackdaroofer)
thats okay, it happens do you think i should put so teflon tape around it to desenitize it?? or i can do what my friend did he bought a custom prom.
