: Knock sensor



MauiV
06-15-10, 02:37 PM
Well had a couple issues with the car this week. Battery has been weak for the past couple weeks, radar detector would kill it if not driven for two days, struggle to start, no big deal. Sunday evening on the way to dinner I got solid check engine light and figure is O2 sensors, MAF or the like since my cat sensors are already tuned off. I also have an oil pressure sensor that has been bad for about a year and a half, so it just shows --- until the occasional once every six month occasion it decides to light up the dash like the 4th of July. If you ever need that "sh*t yourself" feeling have that little beauty go off at 90mph on the Interstate.

Went to Advance this morning to get a new Optima 78 and had the codes ran. Well 5 codes come back, knock sensor-bank 2 being one of them (TAC, throttle and some others which Im sure are related to cutting power). I called my installer and of course he loves to hear this because the knock sensor on the LS6 is under the manifold, which on my car means under the big shiny horsepower persuader.

Anyone else have knock sensors go bad or am I likely looking at a detonation problem and if so what other problems am I looking at? It has been balls hot here this week and I wonder if the heat has played a part in this.

MauiV
06-15-10, 03:04 PM
P.S. I did just clean my engine bay with Black Magic spray and I was reading on Tech that water can throw these sensors off.

Should I reset the coes and allow the car to dry out good and see if it comes back? That should restore the 4* that was pulled because of the code.

Ideas?

heavymetals
06-15-10, 03:31 PM
NEVER EVER hose down an LS6 :helpless:

Water can collect in the knock sensor "wells" and then you got problems.

OT, I was helping Reed with his temp problems (alarms and such) and we are pretty sure we nailed it.

Just waiting for some miles to be sure the fix works.

MauiV
06-15-10, 04:41 PM
Well i reset the codes, hopefully any water left is now evaporated out and the code doesn't return

heavymetals
06-15-10, 05:03 PM
http://www.ls1tech.com/forums/generation-iii-external-engine/977686-pics-my-bad-rusty-knock-sensors.html

jnrandall
06-15-10, 05:15 PM
I had to have mine replaced. I forgot what the symptons were but I suspect mine was a result of messing with them during my engine swap.

http://www.jrandall.com/ctsv/knock1.jpg http://www.jrandall.com/ctsv/knock2.jpg

MauiV
06-16-10, 11:00 AM
Well the code has not come back so hopefully nothing else worth mentioning will come out of this. I do love the way my red top Optima looks in the bay though!!

jaskel
06-17-10, 02:47 PM
if they do end up going out on ya, make sure that when you replace them you lay down some silicone on the rubber boots to seal them up. it will help prevent premature sensor breakdown

MauiV
06-18-10, 01:26 PM
I do plan on using some blue silicon when I replace them. Until I have the time/patience/facility to do it can I just have my tuner turn them off? I was with a bunch of gearheads last night and one that tunes LSx's said the knock sensor is a two key turn code and that it can be turned off. I really dont think I have detonation and knock so anyone see any adverse effect of tuning them out?

CTSV_510
06-18-10, 09:02 PM
I know you don't have a lot of patience Maui but you can do the whole job in an hour. Knock sensors are not something that I would want to tune out...you never know what could happen...

MauiV
06-18-10, 09:23 PM
Is it going to require draining the intercooler and replacing the gaskets?

Twitch
06-19-10, 11:05 AM
I had to have mine replaced. I forgot what the symptons were but I suspect mine was a result of messing with them during my engine swap.

http://www.jrandall.com/ctsv/knock1.jpg http://www.jrandall.com/ctsv/knock2.jpg
Stock valley cover,,,,how cute :stirpot:


I know you don't have a lot of patience Maui but you can do the whole job in an hour. Knock sensors are not something that I would want to tune out...you never know what could happen...
Especially on a boosted motor. ESPECIALLY in the summer!!!


Is it going to require draining the intercooler and replacing the gaskets?
Intercooler doesn't hold that much fluid, most is in the tank and heat exchanger.
I was able to reuse the manifold gaskets, but it's always better to order some new ones. And make sure you get the right ones.

Tony