ls1121

I am sooooo frustrated with this build.

I took my 1998 LS1 and kept only the block and pistons, replaced everything else with 2004 GMPP Z06 parts, heads,cam, everything. So I went from a 305 HP motor to a 405 HP motor and immediately developed knock sensor code issues with a service engine light. I replaced the knock sensors and harness and still the same P0327. Are there adjustments I need to have the Tuner do to eliminate this issue? I would think that a 305 hp motor would make a different noise than a 405 hp one. It's kinda like i'm sitting on some kind of edge, the light will be on for a couple of days then go out by itself and then come on again and off a gain it's making me nutz. 99% of the time it's knock sensor #1.

enoniam

You generally need to desensitize the knock sensors some when installing an aftermarket cam.

ls1121

Is this a common practice? Do all Tuners know how to do this?

enoniam

Can't say for sure about all tuners but it is pretty common knowledge amongst most I'd say.

jglassmaker

did you replace any of the computer modules? I believe a few of them including the one that runs the motor is different.

ls1121

No the only electronics that I replaced were the knock sensors and harness for them.

bikeriderga

I would say the quickest way to resolve this is to reflash the PCM with 2001 + Z06 bin file. However, I am not sure the PCMs and/or ECUs are even compatible between 1998 and 2001 +. I know the base maps for a base coupe and Z06 are not the same, even the same year.

My suggestion would be to call someone like Vengeance Racing, Chuck Cow, Ligenfelter, Calloway, or LSXperts and ask them what they suggest. You don't want to keep running the engine without the proper maps for long or you could do permanent damage.

RonSSNova

Sounds to me like you have a short in the harness somewhere between the knock sensor plug and the pcm.

Has nothing to to do with the tuning.

And no you can't put a later tune in the 98 pcm. 97_98 were unique.

Get a factory service manual and follow the troubleshooting guide for that code.

Ron

nickalltogether

Knock sensors require a specific torque to function properly, so that's something else you can check.

0Chuck CoW

Thank you.

Send us the tune.... and give me a ring so I can see what's wrong with it.

Chuck CoW

ls1121

Thanx for all the replies. I bought 2 more New knock sensors and harness all GM I'll try replacing them again and see what happens.

tblu92

With major mods especially hds and cam and LT headers the knock sensors will pick up new noises that the sensors will interpret as knock when in fact you hear NO detonation
This is common and called "false knock" Tuners can desensitize your knock tables to eliminate this false knock and timing reduction Just be sure you do not HEAR any pinging then you will know the KR is false

RonSSNova

He has a code P0327 that says one knock sensor isn't working.
Has nothing to do with false knock, knock sensitivity or the tune.
Did you all read his post?

ls1121

So I replaced my New knock sensors and wiring harness with more New knock sensors and wiring harness and have the same issue P0327 bank 1 & 2.

anybody want to buy the other New set that nothing was wrong with?

Time to go back to the tuner, getting tired of the B.S. It clears itself sometimes what a PITA.