knock sensor
Thread Starter
Burning Brakes
Joined: Jun 2016
Posts: 761
Likes: 66
From: Fitzwilliam New Hampshire
knock sensor
Read somewhere in cooling flush posts that LT4 knock sensor was upgrade to LT1 knock sensor LT4 not as sensitive just doing a complete flush on my 94 c4 lt1 is it OK to use LT4 knock sensors? Thank You to any reply's
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
LT4 knock sensor is less sensitive to knock than LT1 because of the characteristics of the LT4. Installing the LT4 in a LT1 could lead to engine damage be cause timing doesn't retard when it should. Detonation pops hole in piston....extreme example. LT4 knock sensors can be difficult to find, unless your planning to mod engine your better off using stock parts.
Tech Contributor
Joined: Jun 2004
Posts: 20,847
Likes: 959
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Thread Starter
Burning Brakes
Joined: Jun 2016
Posts: 761
Likes: 66
From: Fitzwilliam New Hampshire
Team Owner
Joined: Sep 2003
Posts: 25,365
Likes: 2,731
The KS are the same for many years - I believe composition of the block and some internal components may change that but it's NOT an OBD1 or OBD2 thing.
The KM can be swapped LT4 to the LT1 and for years I believe it was a choice many made. The LT4 module disappeared years ago and were bringing premium prices for sure. Haven't seen much activity recently regarding them.
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: Jan 2002
Posts: 12,261
Likes: 85
From: O'Fallon Missouri
This is not my experience. Could someone look up the part numbers for 1995 OBDI vs 1996 OBDII.
Team Owner
Joined: Sep 2003
Posts: 25,365
Likes: 2,731
The direct link to a '96 catalog wouldn't stick but here's the catalog you can look for yourself. I didn't debate a Corvette application only your "generalization" OBD1 and OBD2 are different.
http://parts-catalog.acdelco.com/cat...log_search.php
http://parts-catalog.acdelco.com/cat...&parttype=3154
Race Director
Joined: Jan 2002
Posts: 12,261
Likes: 85
From: O'Fallon Missouri
This has always been my understanding.
Originally Posted by tjwong
Just to clarify matters......1994/95 LT1 knock sensors will interchange. 1996 LT1/LT4 knock sensors will not interchange with the earlier model years. Physically they look identical but the internal shunt resistor is of a different value for the different PCM hardware. If you swap them, you will get a DTC 43 if I remember right, and the PCM will retard the timing as a safety measure so that means the car will lose a lot of performance.
Originally Posted by tjwong
Just to clarify matters......1994/95 LT1 knock sensors will interchange. 1996 LT1/LT4 knock sensors will not interchange with the earlier model years. Physically they look identical but the internal shunt resistor is of a different value for the different PCM hardware. If you swap them, you will get a DTC 43 if I remember right, and the PCM will retard the timing as a safety measure so that means the car will lose a lot of performance.