knock sensor
Thread Starter
Burning Brakes
Joined: Jun 2016
Posts: 761
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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
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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
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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
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From: Fitzwilliam New Hampshire
Team Owner
Joined: Sep 2003
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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.
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Race Director
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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
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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
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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.