2000WS6Vert

I'm throwing the dreaded P0327. Now...my car is a 2000 LTs, lid, home ported TB and I put a LS6 intake on it a few months back...so I figure that I too must have pinched a wire when I installed the intaked. So I've been scanning and everytime I really get on the car....it eventually starts throwing 4 KR.

I went and reset the LTFTs and I have that table b/t -4 and 0 now...which is good. So..I went in and backed off the timing wherever I'm throwing KR at. So...I've done this repeatedly....and now I've got my timing down into the teens. I'm getting KR anywhere from 1800 to 6000 RPMs when I floor it. I know this can't be right.....I know the car should be in the 27-28 timing range.

So my question is...if you are throwing the P0327 code.....is it totally pointless to try to tune out the KR that shows up? Does the P0327 code need to be fixed first?

If the code doesn't affect KR....then could there be something else that is causing the KR? Maybe something loose banging on the engine. I noticed my oil level dip stick is loose, and I've got FRC off a vette on there....could these be banging? Maybe something else?

I figure I'll just order a new KR wiring harness on Monday to hopefully take care of the code. Does anyone know what the part number is for the harness?

Thanks!

txhorns281

iTrader: (12)

Yes, you need to fix whatever is the problem with your knock sensor before the PCM will allow you to run normal timing.

2000WS6Vert

Thanks for the response. Do you happen to know what the part # is for the harness? I'm betting that I pinched it when I did the LS6 intake install.

Predator

If you had pinched the wire you would throw both codes, P0327 and P0332. Think about it, if the wire is pinched, the signal from both sensors would be cut off. If you're throwing the one code (P0327), it's most likely a bad knock sensor. With that being said, I would replace both sensors and the wire anyway.

2000WS6Vert

This makes sense. However, does anyone have the part numbers? For both the knock sensor and harness? Also, does P0327 correspond to the front or back wire/sensor?

2000WS6Vert

I just called a local GM parts store. The Knock Sensor wire is part # 1257-5869 and retails at $51.02. Doesn't this sound a bit high?

Edit: I just ordered it through SDPC for $33.52. I knew there was a reason why I don't go to dealerships anymore.

Predator

I'm pretty sure that P0327 is the front knock sensor, but when you pull the intake you'll probably find a rusty puddle of water around the malfuctioning sensor.

I see you have the part number for the harness, but if you want the KS part number let me know and I'll find it for you.

2000WS6Vert

I decided to take my chances on installing just the harness. I'll make sure to dremel a channel on the bottom of my LS6 intake this time.

Just in case I need it...and for the help of others....could you post the knock sensor part number.

Predator

If you're throwing one code you have a bad knock sensor. How you know you have a bad harness is when you throw both codes. It would suck for you to take everything apart, replace just the harness, and then have the code reappear with at least 4* of knock retard.

KS part# 10456603

Get the sensors too dude.

horist

P0327 is the front sensor... but you can set only 1 code w/a pinched wire... I somehow did it heh

I pinched the KS harness between the lifter valley cover (LS6 PCV swap) and block... only pinched a small amount though... but was only causing P0327

Problem is when you set this code, the PCM sets 4* of constant knock, and drops to the low octane tables... so you get like 15* advance at WOT heh

Predator

I had both codes with a pinched wire, but I stand corrected if it's possible to only pinch one part of the wire. It just seems like a much more probable scenario to have both wires pinched, and subsequently throw both codes. Usually one code is the sensor, two codes are the harness, but anything's possible it seems.

2000WS6Vert

This is the identical scenario that I'm getting. 4* KR at WOT throttle. The reason that I think it is only the wire and not the sensor itself, is that before I did the LS6 intake swap, I would trap near 108, after the LS6 intake install....I trap at 104...that is 3 mph. So once I got the HPTuners I could now see the KR and I know where that lost HP went. The pinched wire makes the most sense in my case. I'm taking a chance I suppose, but I'm confident that I pinched the wire when I put on the intake.

Thanks for the part number...I may just go ahead and get one anyways....since I'm there. LOL

Predator

You're not gonna be sure what the cause is until you pull the intake. For example, you could have gotten the sensor wet, even a long time ago, and it's finally corroded enough under there to short the sensor. Who knows? If you haven't done the GM KS TSB (making a silcone dam and removing the foam under the intake) now would be a good time to do it. You'll most likely have to it any way, and if you don't do it now you'll have to pull the intake again. Chances are your sensors are at least partially corroded.

Whatever you do, good luck!!!!

Predator

BTW, instead of the Dremel routine, for wire clearance, just take a palm sander and remove some material where you plan to route the wire. Worked mint for me.

Good luck!!

2000WS6Vert

Thanks for the hints. I'll let you know how things go when I get the parts in the mail.

Predator

Good, I'm interested in hearing what you find out.

2000WS6Vert

I just got an email from SDPC....the wiring harness is on backorder through GM. Doh!

This may take awhile. I think I'm going to tear it all apart tonight and see if I can figure out if it's the wire. What can I say...I'm growing impatient! LOL

Predator

Did you try gmpartsdirect.com?

horist

when I ordered my wiring harness I went through gmpartsdirect and it was backordered there too... guess it's not a normal stock part ...

I may have one I can sell if it turns out you need it... I think I ordered 2 by mistake (thinking I needed 1 per knock sensor instead of 1 for both)

I'll check tonight

2000WS6Vert

If you have an extra...I'll gladly take it off your hands. Let me know.