Exchanging LT1 Knock Sensor's For LT4's ??
Pro
Joined: Oct 2004
Posts: 653
Likes: 10
From: Walton Kentucky
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 pf performance.
Is there such a sensor that will work for the guys (1994 obd1) who upgraded with the LT4 hot cam kit?
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Originally Posted by tvetta
So, guys with OBD1 have no reason to buy the LT4 knock sensor because it will not work? Correct?
Is there such a sensor that will work for the guys (1994 obd1) who upgraded with the LT4 hot cam kit?
Is there such a sensor that will work for the guys (1994 obd1) who upgraded with the LT4 hot cam kit?
Keep in mind there are two parts here the knock sensor (Not interchangeable between OBDI and OBDII) and the knock module Interchangable just not for pre-94. since you have a 94 an LT4 KM will work but unless you have false knock it is a waist of $$$. Just because you install Roller rockers does it does not equale false knock.
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
Ok, possible causes of knock on my car:
Removed AIR
Removed EGR
Due to removal of above I need lower temp spark plugs
It's clear that the timing is off, but LT1 timing can't be adjusted except via ECM. I had a chip burned by Alvin and I'm pretty sure I had those two systems removed, but I need to confirm that I marked the right boxes.
What about the hose routing? I plugged holes to the intake where hoses came off of the air pump, and the holes in the back of the intake where the EGR valve went. Is rerouting some of the hoses required? I searched for info on this and most of it was for L98 cars.
Will all of the compensation for removal of these systems be done by the computer?
This is a track only car, please no flames about polluting the environment.
Thank you.
Removed AIR
Removed EGR
Due to removal of above I need lower temp spark plugs
It's clear that the timing is off, but LT1 timing can't be adjusted except via ECM. I had a chip burned by Alvin and I'm pretty sure I had those two systems removed, but I need to confirm that I marked the right boxes.
What about the hose routing? I plugged holes to the intake where hoses came off of the air pump, and the holes in the back of the intake where the EGR valve went. Is rerouting some of the hoses required? I searched for info on this and most of it was for L98 cars.
Will all of the compensation for removal of these systems be done by the computer?
This is a track only car, please no flames about polluting the environment.
Thank you.
Melting Slicks
Joined: Dec 2000
Posts: 2,719
Likes: 59
From: Fremont Oh
Scary,
Are you sure you don't have like a header or something knocking something underneath?
Have you tried like some octane booster to see if the knock count drops, or are you perhaps running too much advance?
Just some thoughts...
Mo
Are you sure you don't have like a header or something knocking something underneath?
Have you tried like some octane booster to see if the knock count drops, or are you perhaps running too much advance?
Just some thoughts...
Mo
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
Originally Posted by Mo_Bandy
Scary,
Are you sure you don't have like a header or something knocking something underneath?
Mo
Are you sure you don't have like a header or something knocking something underneath?
Mo
I also installed 1.6 RR, another source of false knock for LT1's. How would these be causing real knock?
And if they somehow are, how does one fix it?
I hijacked someone else's thread here, I'm moving this to my own:
http://forums.corvetteforum.com/show...post1552623394
