Knock Sensor replacement how-to? - MY350Z.COM - Nissan 350Z and 370Z Forum Discussion



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Old 03-15-2011, 08:37 AM   #1
vfr350
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Default Knock Sensor replacement how-to?

Had my emissions checked today, getting a P0327 code. I know i have looking into this before, and a swear I've seen a how-to on this. Can anyone help point me in the right direction? Suggest where to purchase the sensor and harness, or part #'s? 03 350z. Sorry if this is redundant at all.
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Old 03-15-2011, 10:46 AM   #2
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You have to remove the upper, lower and intake runners to get to it.
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Old 03-15-2011, 12:54 PM   #3
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^^^What he said is true.
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Old 03-15-2011, 01:31 PM   #4
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what terrasmck said. I have a brand new knock sensor i will sell for 55 shipped to your door if you are interested.
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Old 03-15-2011, 06:32 PM   #5
vfr350
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I know where its at, the issue is with the fuel injectors and such. Can the sensor in fact be removed without tearing the fuel system apart? Maybe someone with first hand experience can join in.
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Old 03-15-2011, 06:36 PM   #6
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Quote:
Originally Posted by vfr350 View Post
I know where its at, the issue is with the fuel injectors and such. Can the sensor in fact be removed without tearing the fuel system apart? Maybe someone with first hand experience can join in.
No, i know for a fact because i tore my spare engine down last month.

In all actuality, it should only take a couple hours to perform the swap. Do a spacer and Mrev while your at it.
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Old 03-15-2011, 06:39 PM   #7
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yep, took about 1-2 hours total. i remember diconnecting a hard fuel line and gas pouring out.. no biggie though
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Old 03-15-2011, 07:39 PM   #8
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My intent is not to insult, please do not take it as such. Since I bought the car in 03 this forum has been a wealth of knowledge. I don't keep up as much with who is posting nowadays so I can't gauge what everyone knows. As for working with fuel systems, it's something I'm not as familiar with. Trying to paint as best a picture i can for myself w/o spraying gas all over it. As far as plenum spacer, did that when I installed the Crawford Plenum hat (whats the MREV?). I also put the headers in myself, so i'm not worried about my ability, just if its worth my time. Anyway, some time ago somewhere I remember seeing a guide or how to on this, just hoping to locate it, or more detail on the fuel setup, like do you need to pull the injectors to get the lower manifold out?
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Old 03-15-2011, 07:45 PM   #9
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After taking off the plenum and lower plenum, you will see this..



then unbolt the fuel rails to get the lower intake manifold out.



See that blue harness under that lower intake manifold? thats the sensor.

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Old 03-15-2011, 08:55 PM   #10
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If you can do headers, you can easily do this.
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Old 03-16-2011, 12:01 PM   #11
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Thanks for the pics, by the looks of it pulling the injectors is necessary...

window motors, transmissions, tires, axle clicking, knock sensor, never stops with this thing....never by a first year run car....never
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Old 03-16-2011, 12:28 PM   #12
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don't stress too much about removing the injectors. When I replaced my knock sensor a couple years ago, I had never touched the lower plenum, collector or injectors before and I did just fine. Just take your time, make sure the gaskets are free of any debris or dirt, and tighten everything back according to the torque specs.

The first time I reassembled everything, I had some bad vacuum leaks which I assume were coming from some sand on the gasket preventing an even seal. While you're in there, you may want to consider replacing the wiring harness for the sensor as well. Nissan doesn't sell it as an individual part, but you may find some people on the board selling spares.

Good luck!


Edit: I got the same code as you, and my car kept going into limp mode. I replaced the sensor and wiring harness, but it didn't fix the issue for me. I ended up taking it to Nissan and they determined it was a faulty TB causing the issues and throwing the code.

Last edited by jtabraham; 03-16-2011 at 12:31 PM.
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Old 03-16-2011, 02:00 PM   #13
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ok, so if i'm going all in, is this the harness you are talking about or is there just one separate pigtail?

http://www.z1motorsports.com/350_g35...oducts_id=3189

I have seen a few different manufactures of sensors, should I just stick with Nissan OEM? Gaskets, just reuse? I should be able to dig up the torque specs. If I can get this fixed I might seriously consider having the Flash tweaked.
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Old 03-16-2011, 02:25 PM   #14
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Bored at work, heres the torque charts.
Attached Thumbnails
Knock Sensor replacement how-to?-intake-1.jpg   Knock Sensor replacement how-to?-intake-2.jpg  
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Old 03-17-2011, 05:17 PM   #15
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Ok, so fill me in on the MREV as well, is it a new cast manifold, ported stock? States gains on the revup engine, which i don't have, anyone using it on a non revup? Best price? Core return? Dyno's? Think this is the only bolt on i don't have..
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Old 03-17-2011, 06:16 PM   #16
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Its a ported stock non rev lower. Has benifits for the non-rev motor but IMO , i wouldn't bother with it unless your doing a full NA build. Sorry i mentioned it.

http://www.motordyneengineering.com/...b681b66001f3d5

Last edited by terrasmak; 03-17-2011 at 09:46 PM.
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Old 03-17-2011, 07:14 PM   #17
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No reason to be sorry, as i never heard of it. Looking a graphs looks like the Crawford plenum is the right setup for my car. Sure once i get the code fixed i will get more HP back than the MREV would ever give, save the MREV money for a good tune, which hopefully I can find a place in Chicagoland that can be recommended. Anyone ever think the knock sensor goes bad with UR pullies?
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Old 03-17-2011, 09:47 PM   #18
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Quote:
Originally Posted by vfr350 View Post
Anyone ever think the knock sensor goes bad with UR pullies?
Highly doubt it. BTW i also added the link for the Mrev2 manifold. It would work in conjunction with your Crawford upper.
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Old 03-18-2011, 10:19 AM   #19
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Making a separate thread on the MREV, data seems inconclusive and no sense high-jacking the knock-senor thread, all parts ordered, result will be posted someday.
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Old 03-10-2017, 06:29 PM   #20
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bringing this back from the dead. i know a couple people have been able to tackle this knock sensor sub harness without removing any of the plenums. by using a long screw driver is what i read/heard. anybody have any insight on this?
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