Jump to content
SAU Community

M35 Knock Sensor Wiring Stripped -advice Please

malialipali

By malialipali,
in Four Door Family & Wagoneers

 Share

Recommended Posts

malialipali Enthusiast

malialipali

Posted
Posted (edited)

So I just did the belts on the stagea and low and behold whilst flashing the light about I see some bare wires.

I'm assuming it's the knock sensor , it's a two wire plug between the v under the intake. Can be seen from the front in the opening between the heads. One wire is bare other looks to be cut. (Looks like mice got to it :-/)

Car does not ping.

So my question is. Does the intake have to go in order to get to it and fix the wiring ? If so should I just do the rocker cover gaskets(passenger side weeps only just) and plugs 143xxxkm. Or am I going beyond what's needed to get to the knock sensor.

Car goes beautifully just last weekend did 1000km round trip and got 720km out of a tank (ultimate ) with no hesitation what so ever even snapped the speedo on a overtake.

Thanks for any and all advice.

Edited by malialipali
scotty nm35 Grand Master

scotty nm35

Posted
Posted

Surprisingly common, I have had to repair a few. I should have a spare knock/injector loom here somewhere if you can't find something local.

Yes the lower plenum needs to come off to replace it.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Nice and warm Dale, for many hours. Smart little f*krs would just nest it out with rags and grass, anything they can find to make a cosy and protected home.

As soon as the door unlocked they would know to scurry away.

malialipali Enthusiast

malialipali

Posted
  • Author
Posted (edited)

Surprisingly common, I have had to repair a few. I should have a spare knock/injector loom here somewhere if you can't find something local.

Yes the lower plenum needs to come off to replace it.

Is the wiring shielded? If not I can repair the plug thats not an issue. If it is shielded then yes I would need the part.

Is there a part # ? Same as the VQ35s? by any chance. Is this the guy I'm looking for https://www.z1motorsports.com/oxygen-and-knock-sensors/z1-motorsports/350z-g35-vq35de-knock-sensor-sub-harness-p-5833.html?osCsid=keol7gu21kictn9cop24pqrhb4

If I cant find anything by end of tomorrow, I'm happy to pay what it cost + express bag postage Scotty.

OK just did a quick google (currently at work so cant dedicate too much time) looks like 50ohm RG58U coax on the positive side. 99% confident I can repair it. So will give it a crack to repair the wire.

If the car ends up off the road for a few days so be it - ive got a spare.

Cheeky little feckers they are...

I was actually joking when I said looks like mice got to it o.O , now I find that this is actually true and common. WTH!

May as well dot the plugs since I'm gonna spend next Saturday over an engine bay.

Anything else I should to preventative wise. Not fussed on $ , I'm driving the car to Adelaide next month and need to make sure its healthy.

Thanks a bunch on the help All .

Edited by malialipali
scotty nm35 Grand Master

scotty nm35

Posted
Posted

You had better get it apart and see what's broken first, you may need the knock sensor too.

Yes, that loom looks similar, on ours it's wired into the injector harness, but you can simply run that one in addition to replace the chewed out part.

  • Like 1
malialipali Enthusiast

malialipali

Posted
  • Author
Posted (edited)

So spent most of the day (38C here today) over the engine bay listening to tunes and drinking beer.

Stripped the intake off, rigged up a hose to my wet and dry vac and vacuumed up sand/ grit, dirt 2 snail shells ??????? (where the hell do they come from) from around the intake before taking it apart.

Cleaned the intake sections with carb cleaner . Got the harness out and assesed. Looked like shit!. stripped it back de-pinned the connector. Soldered in new leads. Coax wire was perfect fit. Soldered the pins and reassembled the connector.

Knock sensor tested at 562K Ohm (well within the range). With the harness it tested at 559K Ohm still in range.

Did the spark plugs at the same time, who ever did the car last should be slapped !!! had Champion Platinums in there with a 14 (NGK4) heat range .... way too hot , guess they whacked in 350 plugs, electrodes were worn to heck too probably 1.4-1.5mm gap. Got some LFR6AIX.

Put it all together and the moment of truth, fired up first go. Went for a test run , Significant improvement on take off, tried stalling it up and lit up the rears ! never happened before.

I think I just thought these cars were good at WOT and sluggish otherwise......... proven wrong now. Very very happy with the improvement.

Thank you all for your help , Esp Scotty for telling me the whole intake needs to come out.

Total cost $123.70 including the plugs (had to buy the coax and I ran out of heatshrink)

Edited by malialipali
  • Like 2

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Manur33
      Vag Coil Diy loom wire guage selection

      By Manur33 · Posted

      Can u check this way it works for power supply?
    • Manur33
      Vag Coil Diy loom wire guage selection

      By Manur33 · Posted

      These coils draw 10amps that what i read online
    • nouveau_poor
      Unknown sound similar to BOV on positive boost with partial throttle RB26

      By nouveau_poor · Posted

      I appreciate the detailed explanation, think I understand now. I spent the better part of last night reading what I could about shuffle and potential solutions. I had replaced the OEM twin turbo pipe with an alternate Y pipe that is separated further away from the turbo. The current one is from HKS and I had a previous pipe that was separated even further away, both have shuffle. I had heard that a divider can be welded in to the OEM pipe to remove turbulence, and figure that aftermarket pipes that are more separated would achieve the same thing. From what I read, most people with -10 turbos get shuffle due to their size, though it's a bit less common with -5s on a standard RB26. I think Nismoid mentioned somewhere it's because OEM recirculation piping is common in Australia with -5 cars. It seems that the recommendation tends to vary between a few options, which I've ordered in what I think is most feasible for me:  1. Retune the MAP or boost controller to try to eliminate shuffle 2. Install OEM recirculation piping 3. Something called a 'balance pipe' welded onto the exhaust manifolds. I don't know if kits for this are available, seems like pure fabrication work 4. simply go single turbo My current layout is as follows: Garrett 2860 -5s HKS Racing Suction intake MAF delete pipes HKS racing chamber intake piping hard intercooler piping,  ARC intercooler HKS SSQV BOV and pipe Haltech 2500 elite ECU and boost solenoid/controller HPI dump pipes OEM exhaust manifolds HKS VCAM step 1 and supporting head modifications Built 2.6 bottom end All OEM recirculation piping was removed, relevant areas sealed off I'll keep an eye out for any alternative solutions but can get started with this.  Only other question is, does shuffle harm the turbo (or anything else)? It seems like some people say your turbo shafts will explode because of the opposing forces after a while and others say they just live with it and adjust their pedal foot accordingly. 
    • codygrimm27
      Can you mount the ATTESA pump in other locations?

      By codygrimm27 · Posted

      That worked out PERFECTLY! Thank you big time to JJ. He was able to swap me his stock diff. He drove all the way to me as well. Killer! Removal & install was pretty straightforward. The diff itself is HEAVY. So that’s a 2 man job.  Man does the car drive nice now! Couldn’t have worked out any better 👌
    • DannyDee2
      First time owner v35

      By DannyDee2 · Posted

      Welcome mate!
×
×
  • Create New...