unplug knock sensor?
Thread Starter
Joined: Nov 2001
Posts: 7,903
Likes: 1
From: Cleveland, OH
unplug knock sensor? I have a 2000 ws6 and would like to run with the knock sensor unplugged? Where exactly is the easiest place to do this and yes I know all the reasons I shouldnt.
Thread Starter
Joined: Nov 2001
Posts: 7,903
Likes: 1
From: Cleveland, OH
Re: unplug knock sensor? I WANT 4 degrees of KR...I have 24 degrees of timing running 7psi....I want to try 10 psi and would feel better with only 20 deg of timing and 100 octane. So....
TECH Addict
Joined: Nov 2001
Posts: 2,556
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From: Nawf Carolina
Re: unplug knock sensor? Ahh, well they're located under the intake manifold, join the wiring harness behind the motor I guess? They look like 2 black circles.
http://xs-fx.com/raughammer/HeadsCam2/no_intake.jpg
I wonder if you could put a switch inline, so you could switch them on and off.
J.
http://xs-fx.com/raughammer/HeadsCam2/no_intake.jpg
I wonder if you could put a switch inline, so you could switch them on and off.
J.
Thread Starter
Joined: Nov 2001
Posts: 7,903
Likes: 1
From: Cleveland, OH
Re: unplug knock sensor? can i just clip one of the wires from either knock sensor at the pcm and get a standard -4 deg retard? If so I'll just use a switch to turn it on and off.
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TECH Apprentice
Joined: Jan 2002
Posts: 356
Likes: 0
From: Texas
Re: unplug knock sensor? If the PCM doesn't see the knock sensors, you get a constant 4 degrees of retard, giving 24 degrees advance timing instead of 28. If your PCM is seeing knock retard now that is giving you the 24 degrees, unplugging them will do nothing for you(as the PCM works off the WOT timing tables). If your PCM is reworked and 24 degrees is the new WOT advance you get, I am very curious as to what happens when you unplug your knock sensors.
As far as unplugging them, it is just that. Unplug them. The wire harness runs under the intake manifold to the back of the motor. It will take some feeling around, but you will find it. There is a plug back there that connects the short under manifold wiring to the main harness right there. Just unplug it. Don't cut any wires and such....Be sure though, as the cam position sensor and the MAP sensor plugs are also back there.
Todd
As far as unplugging them, it is just that. Unplug them. The wire harness runs under the intake manifold to the back of the motor. It will take some feeling around, but you will find it. There is a plug back there that connects the short under manifold wiring to the main harness right there. Just unplug it. Don't cut any wires and such....Be sure though, as the cam position sensor and the MAP sensor plugs are also back there.
Todd
Re: unplug knock sensor? Todd is correct, unplugging the K-sensors makes the PCM default to -4 degrees knock retard at all times. The only way to get rid of this is to delete the SES with AutoTap, it will not return to normal by simply plugging back in the K-sensors. So, an off/on switch is of no use here.
Knock-Out Box details can be found on the link at the bottom of my signature.
Tony
Knock-Out Box details can be found on the link at the bottom of my signature.
Tony
Re: unplug knock sensor? [quote]Originally posted by Crazyquik:
<strong>I dont know, and I dont want to say one way or another b/c I'd hate to lead you wrong. Maybe you should ask Harlan (he's an electrical engineer or something)</strong><hr></blockquote>
<img src="gr_grin.gif" border="0">
The info so far is about it.
You can unplug then at the back of thge driver side valve cover. Connector is clipped to the bracket just at the end of the fuel rail.
Like black 98 said, if you see full timing and no KR, then you'll drop 4°. If your seeing 4 KR now, you won't get any more than that at WOT.
<strong>I dont know, and I dont want to say one way or another b/c I'd hate to lead you wrong. Maybe you should ask Harlan (he's an electrical engineer or something)</strong><hr></blockquote>
<img src="gr_grin.gif" border="0">
The info so far is about it.
You can unplug then at the back of thge driver side valve cover. Connector is clipped to the bracket just at the end of the fuel rail.
Like black 98 said, if you see full timing and no KR, then you'll drop 4°. If your seeing 4 KR now, you won't get any more than that at WOT.
Thread Starter
Joined: Nov 2001
Posts: 7,903
Likes: 1
From: Cleveland, OH
Re: unplug knock sensor? Thanks for that info harlan. Ok I unplugged the harness behind the drivers side fuel rail...had 2 wires light/dk blue. Now my timing at idle is still the same...Atap shows no -4 kr and no SES light was set...what gives? Do I have to do something special to know if this is working right? Like maybe go wot down the road? Too much traffic for now to do that
Thread Starter
Joined: Nov 2001
Posts: 7,903
Likes: 1
From: Cleveland, OH
Re: unplug knock sensor? Apparently something is screwy. I tested it..got no SES light but it did set a code for both sensors. My timing retarded like 22 degrees to ZERO! So I guess that idea is out. This is with an Ed wright PCm so maybe its something he has done
