Search



Go Back   Third Generation F-Body Message Boards > Tech Boards > Tech / General Engine
Register Forgot Password?

Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Sponsored by Weld Racing
Click Here

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools Search this Thread
Old 09-14-2010, 05:00 PM   #1
Member
 
Join Date: Nov 2003
Location: Montréal
Posts: 329
Car: GTA WS-6 1989 fully loaded
Engine: 1995 9C1 LT1 police pak XE cam
Transmission: t-5 borg warner

Classifieds Rating: (0)
knock sensor bypass???

can i bypass knock sensor+ modile plz help
__________________
14,02@97mph on 7 cylinders! no more posi...
oops now 13,01@111mph lt1 powered
FOX-GTA_89 is offline vBGarage Page   Reply With Quote
Old 09-14-2010, 06:36 PM   #2
Supreme Member
 
Join Date: Sep 2002
Location: Cary, North Carolina
Posts: 9,192
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi

Classifieds Rating: (0)

Send a message via AIM to camaronewbie
Re: knock sensor bypass???

No. The ECM takes the info it gets from the knock sensor and uses it to advance/retard timing as needed so that you don't have knock. Knock is bad - if knock is happening then engine could be very short lived if it's not corrected. If you swap to a non-cc carb setup, you then can remove knock sensor, but otherwise you need it. The knock sensor can detect knocking that you cannot.
__________________
1992 25th Anniversary RS T-Top
350 Carb 10:1 Dometops Mild Cam
Hedmann Headers Hi-Flo Cat/Aerochamber Muffler
700R4 B&M Shift Kit LS1 Disc Rear w/3.42 Posi
Poly Bushings Eibach Prokit Bilstein Shocks/Struts
HOK Candy Teal on Silver Flake IROC Hood
camaronewbie is offline vBGarage Page   Reply With Quote
Old 09-15-2010, 05:41 AM   #3
Supreme Member
 
Join Date: Sep 1999
Location: Philly, PA
Posts: 6,635

Classifieds Rating: (0)

Re: knock sensor bypass???

You can make the system "blind" if you want to do some testing. Just run the KS wire to a 3900 Ohm resistor (Radio Shack) and the other side of the resistor to a good ground. That's the same resistance as a stock knock sensor of that vintage but, obviously, it will never hear any knocking since it isn't connected to the real KS any more.

You can't just unplug it becuase the ECM/knock module tests that connection (I believe at startup, if memory serves). If it doesn't see resistance within a certain range it throws the penalty flag. That's why you simulate it's existance with an appropriate resistor.
Damon is offline vBGarage Page   Reply With Quote
Old 09-15-2010, 06:39 AM   #4
Member
 
Join Date: Nov 2003
Location: Montréal
Posts: 329
Car: GTA WS-6 1989 fully loaded
Engine: 1995 9C1 LT1 police pak XE cam
Transmission: t-5 borg warner

Classifieds Rating: (0)
Re: knock sensor bypass???

im havin a 305 tpi car with a 350 can i use a 350 knock sensor on a 305 module?im using the 305 for now...

im affraid that my ecm retart timming due to wrong sensor + veryloud headers and exhaust
FOX-GTA_89 is offline vBGarage Page   Reply With Quote
Old 09-15-2010, 06:47 AM   #5
Junior Member
 
Join Date: Dec 2009
Location: Fargo Nd
Posts: 83
Car: 92 chevy 1/2 4 wheel drive
Engine: 5.0L with TPI
Transmission: 700R4
Axle/Gears: 3.73

Classifieds Rating: (1)
Re: knock sensor bypass???

i understand the modules are the same and the knock sensor is whats diffenert.
wyochimneysweep is offline vBGarage Page   Reply With Quote
Old 09-15-2010, 06:51 AM   #6
Member
 
Join Date: Nov 2003
Location: Montréal
Posts: 329
Car: GTA WS-6 1989 fully loaded
Engine: 1995 9C1 LT1 police pak XE cam
Transmission: t-5 borg warner

Classifieds Rating: (0)
Re: knock sensor bypass???

305 and 350 tpi are exacty the same exept

block
heads
knock sensors
distributor module
injectors
belt routine
FOX-GTA_89 is offline vBGarage Page   Reply With Quote
Old 10-10-2012, 10:56 AM   #7
Junior Member
 
Join Date: Feb 2012
Location: Illinois
Posts: 73
Car: 1992 RS vert
Engine: forged 383
Transmission: a busted one for now ;)
Axle/Gears: 4th gen 3.73

Classifieds Rating: (0)
Re: knock sensor bypass???

so swapping to a carb, removing ECM and gutting wiring harness/swapping to painless, i can just plug knock sensor hole? im swapping a 305 TBI for a base GM crate carb'd 350 with roller cam, alum heads, headers, gear drives and blower.
johnf123 is offline vBGarage Page   Reply With Quote
Old 10-10-2012, 08:41 PM   #8
Supreme Member
 
Join Date: Sep 2005
Posts: 15,716
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere

Classifieds Rating: (1)
Re: knock sensor bypass???

Quote:
i can just plug knock sensor hole?
Of course!!!

Those engineers back in 1955 when they invented the Small Block Chevy, they just KNEW the Frod engineers were going to be looking over their shoulder; so instead of letting on that they had a crystal ball to see the future with, they CLEVERLY DISGUISED the knock sensor port, since of course in 1955 they already knew EFI was coming SOON, as the passenger side coolant drain hole.

So you can just go back to the old-school thing and put a ¼" pipe plug in it like we all did from 1955 up until 81 or whenever it was that the computer-controlled carb appeared.
__________________
Numquam ponenda est pluralitas sine necessitate.
— William of Ockham, c. 1330 AD, from Quaestiones et decisiones in quattuor libros Sententiarum Petri Lombardi

Roughly paraphrased into modern English, and applied to figuring out what's wrong with your car:

The simplest explanation that fits all the facts is probably the right one.
sofakingdom is offline vBGarage Page   Reply With Quote
Old 10-11-2012, 09:19 PM   #9
Supreme Member
 
Join Date: Sep 1999
Location: Philly, PA
Posts: 6,635

Classifieds Rating: (0)

Re: knock sensor bypass???

Wisenheimer, Sofa. Don't tease the young'uns. They don't know because they weren't even born before EFI engines were commonplace. Not their fault when they were born.

He's right, of course, he's just poking a little fun at you.
Damon is offline vBGarage Page   Reply With Quote
Old 10-11-2012, 11:44 PM   #10
Junior Member
 
Join Date: Feb 2012
Location: Illinois
Posts: 73
Car: 1992 RS vert
Engine: forged 383
Transmission: a busted one for now ;)
Axle/Gears: 4th gen 3.73

Classifieds Rating: (0)
Re: knock sensor bypass???

yeah im 17 im learning alot from my build! most kids my age blow ther money on booze and drugs and me and my best friend blow our money on my camaro haha
johnf123 is offline vBGarage Page   Reply With Quote
Old 10-14-2012, 11:59 AM   #11
Supreme Member
 
eseibel67's Avatar
 
Join Date: Jul 2009
Location: Kitchener, ON
Posts: 1,854
Car: 1988 GTA
Engine: LB9
Transmission: T5
Axle/Gears: 3.45

Classifieds Rating: (0)
Re: knock sensor bypass???

Quote:
Originally Posted by johnf123 View Post
yeah im 17 im learning alot from my build! most kids my age blow ther money on booze and drugs and me and my best friend blow our money on my camaro haha
Cars are also a waste of money, but at least your having fun and learning something. The skills you acquire in car repairs will come in handy in the future when your refrigerator craps out. Not too many kids these days are interested in cars, keep it up. Your lucky that you have these forums to help you along, when I was your age, all I had was a crappy Chilton manual.
eseibel67 is offline vBGarage Page   Reply With Quote
Old 10-14-2012, 11:59 AM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > Tech / General Engine

Tags
60, borg, bypass, car, chevy, delete, drive, gen, happen, knock, ls1, sensor, sensors, unplug, warner
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 09:19 PM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
All content copyright © 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.

Emails & Contact Details