Knock Sensor relocation problem - Nissan Xterra Forum
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post #1 of 12 Old 11-20-2010, 12:21 AM Thread Starter
Pumpkin
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Knock Sensor relocation problem

I just replaced my supercharger, because it was really noisy. The new one seems to be working great (much quieter). I previously had my knock sensor relocated, to the the side bolt of the s/c. I was still getting low boost and lack of power. My mechanic removed the sensor from the side of the s/c, ran a ground wire from the sensor directly to the negative side of battery, and wrapped the sensor (in bubble wrap??) Anyhow This worked great but looked like crap. I was wondering, would it hurt anything to still have it bolted to the s/c, but also have a separate ground wire running to the negative battery terminal? This is the only solution I can think of to get a proper ground.
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post #2 of 12 Old 11-20-2010, 12:38 AM
J Everett
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post #3 of 12 Old 11-20-2010, 11:39 AM
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I had the same problem. So I just ran the ground wire to the eng block and tied the knock sensor back to the harness with some zip ties and e tape. You can't even see it

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post #4 of 12 Old 11-21-2010, 03:34 PM
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were you still throwing a code with out the ground? I have mine bolted to the SC bolt on the right side also, but I didn't run a separate ground wire...but Im also not throwing a code...

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http://www.clubxterra.org/forums/showthread.php?t=16837

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post #5 of 12 Old 11-22-2010, 08:48 PM Thread Starter
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I added the ground wire today, it didn't seem to work though. I still have the same lack of boost/power. No codes. I'm thinking removing it from the engine altogether might be the only option, but I kinda want it to be functional still. I don't like the idea of the engine knocking and blowing up because there's no knock sensor. Any other locations that might work?
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post #6 of 12 Old 11-22-2010, 10:57 PM
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you replaced the supercharger and didn't throw in a knock sensor? are you sure you got a good one? I've heard the $20 ones off ebay practically come dysfunctional.

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post #7 of 12 Old 11-23-2010, 08:29 PM
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how could it be pulling boost but not throwing a code??? I figured that if the code wasnt there then everything was fine...I hope mine is ok!

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http://www.clubxterra.org/forums/showthread.php?t=16837

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post #8 of 12 Old 02-03-2011, 12:47 PM
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Does this Knock sensor relocation allow for more "safe boost"

looking for:
1.USED front and back diff gears 4.88 or 5.13
2.USED ARB front and rear locker
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post #9 of 12 Old 02-04-2011, 05:26 AM
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no, a bad KS prevents you from getting the actual boost you are supposed to. It limits you to about 2lbs instead of the 5 or 6lbs (can't remember off the top of my head).

It costs about $900 to have a stealership replace the KS due to it's location. Relocating it is cheap, but about a 50/50 chance of actually working properly (from the research I have done, it's been 50/50. Relocating allows you to get the boost you should be getting from the factory). I relocated mine to the SC and would get one good run before it would go back to fail safe mode, I sinced deployed so I haven't been able to find a better location.
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post #10 of 12 Old 11-11-2012, 06:01 PM
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Exclamation Knock sensor relocation

Hi, I relocate the knock sensor in the side of the supercharger one day ago. And my X still having the lack of power/boost. The KS is nissan genuine. With a voltimeter I see the KS is sending 2 volts at idle. And with the engine off has a 280 Mohm of resistance. Are this numbers good? The change in power/boost are fast after the relocation?
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