Siamanis

thats right...what is an lt4 knock sensor...ive read about it in just about every other post and find myself wondering...

Injuneer

I think you mean the LT4 knock module.

It is a small "filter" chip in the PCM that intercepts the noise signal from the knock sensor, and filters out noise that is associated with things like roller rockers. Helps prevent the PCM from interpreting that noise as "knock" and pulling timing to eliminate the knock.

Siamanis

so what are they doing so good for everyones engines...whys everyone got one...is it "fail-safing" the computer for a misinterpretation?

Kataklysm

The LT4 KM doesn't pick up as much false knock as the factory LT1 module. This makes it so the timing won't go out of whack due to false knock.

Siamanis

so is it something i should look into investing in...how much?

roadrage912

everyone has the for the reason that injuneer said. if you upgrade to louder internals like roller rockers or sometimes even aftermarket exhaust and headers can cause enough noise and be interpreted as "false knock" and the pcm will retard the timing. the lt4 knock module eliminates this false knock.

Siamanis

ok...ive got a cat back right now and am planning on headers for this summer...BTW what kind should i look into...i guess the LT4 KM will be useful after i get those headers in?

roadrage912

well it only costs about 30 bucks so it's worth buying anyway. what headers to get depends a lot on what you plan to do in the future, like lowering or doing 383 or whatever.

Siamanis

lowering as in lowering the car...i plan on doing that...i guess if this is what your asking i want to make it a low 12's car...thats my first goal i guess. and what about those long tube headers are all of those illegal? where can i find a lt4KM

roadrage912

you could check ebay but all of the LT4 KMs are 40 bucks plus shipping right now (i just checked for my buddy earlier today). i wouldn't pay more than 35 bucks plus shipping for one. if ur curious about headers then y don't u make a post about them, or try searching old posts 'cuz i'm sure there's hundreds.

Kataklysm

www.gmpartsdirect.com part # 16214681

Siamanis

cool, thanks everybody

ToocoolZ28

I put one in mine and it it knocked terribly. Under part throttle with no load it rattled like marbles in a coffee can. I put the stock one back in and its good as new.
Ron

Siamanis

so you dont think i should get one...

krispy

get it, only $30, if it doesnt work for you then turn around and sell it, someone is always looking for one

im going to get one and see if it does anything