Jump to content
SAU Community

Melted O2 Sensor Harness Plug

chrisR34GTT

By chrisR34GTT,
in General Maintenance

 Share

Recommended Posts

chrisR34GTT Community Regular

chrisR34GTT

Posted
Posted

Hi guys,

Recently installed a turbo back exhaust in my R34 and didn't replace the turbo heat shield and forgot to zip tie my O2 sensor harness away from the heat.. I know :P ! So for a few days the car ran great, then it felt like it was missfiring (noob assumption)/ cutting out. Thought it was coilspack or fouled plugs, so I popped the bonnet and discovered that my O2 sensor (on the harness side) had melted because it was resting on the turbo housing... So how can I determine if a) I need a new sensor or, b) which fuse to check?

Help would be great!

Chris

Link to comment
https://www.sau.com.au/forums/topic/280526-melted-o2-sensor-harness-plug/
Share on other sites
GTRPSI Mentor

GTRPSI

Posted
Posted (edited)

Or c), redo the burnt part of the wiring first?

Hope you have not cooked something more serious like the ecu, im unsure if there is an inline fuse.

Edited by GTRPSI
chrisR34GTT Community Regular

chrisR34GTT

Posted
  • Author
Posted

I can't redo any wiring as it is the side of the plug that was burnt, so only the internal crimp was exposed.. I don't know how to explain it better than that. I will post a photo tomorrow. I don't think I have harmed the ecu, but how can I check?

Anything else it could be, basically the the o2 sensor harness melted and one of the internal wires was touching the turbo housing... What else should I check?

chrisR34GTT Community Regular

chrisR34GTT

Posted
  • Author
Posted

Had another look today and I think I may have damaged the computer... I reset the ecu by unhooking the battery and leaving the headlights on for a minute. Then when I turn the key to IGN I hear a whurring noise and the front demister light flashes, so I start the car and it stutters at idle. Give it some throttle and on the decel it nearly stalls.

Could I have really damage the ecu, what else could these symptoms be for? I think I might just get the car towed to a mechanic Monday, so any advice as to the direction I could point the mechanic would be great!

GTRPSI Mentor

GTRPSI

Posted
Posted

Why dont you bypass the plug by stripping some wire on the o2 sensor and the wireing loom and make a bridge with some crimp type plugs and some wire?

If your ecu isnt getting any o2 sensor reading it will most likely run like a dog, also the ecu has to relearn after its reset.

Worst case a second hand ecu from the buy/sell section, should be less than $150.

EJD001 Mentor

EJD001

Posted
Posted

i dont see how you people are saying it would have hurt the ECU.. no charge or over over currant of power would have been sent through to the ECU. it would be running like a dog cause the wiring for the 02 sensor has melted- thus no signal getting through. Take it to a good Auto elec on monday and they might be able to solider a new plug and wire to the undamaged part of the harness in your car. Then take it for a drive..

You have to start with the obvious and simple things first, then if that doesnt work , look a bit deeper.

Hope this helps

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

    • Pac
      2020 Nissan Skyline 400R V37/Infiniti Q50 RS insurance in NSW

      By Pac 路 Posted

      Yeah they charge a little extra for mods , last year I noted no mods but I did have an exhaust fitted after that so  better to let them know cause these kinds of things can cause the policy to be void if you ever need to claim.
    • Tekitsune
      Upgrade an rb25neo

      By Tekitsune 路 Posted

      Hello, just just bought an 1999 enr34 with a stock rb25neo and I'm looking to upgrade the engine to 500whp I know some basic things but wondering if there are things I'll need to do to upgrade the stock block and all the bits and pieces to achieve this.
    • DatsunBanana
      Rear subframe stay bracket bolt removal issues

      By DatsunBanana 路 Posted

      Thanks everyone for the replies and suggestions. Got the seats out (hoping I could find some existing grommets but no such luck). By tapping and measuring etc. I could figure out where I could drill through if needed. But first I borrowed an inspection camera and managed to go through factory holes in the chassis rail and could see that the captive nut was holding steady which is why it could retighten. So it was indeed a stripped section of thread, so I applied downforce by levering the bolt head with a screwdriver and went slowly back and forth until it came out. Camera helped a lot cos I could monitor that the captive nut was holding tight. Now I just have one very seized main subframe nut to tackle 馃槄
    • Dose Pipe Sutututu
      Question about BoV on RB25DET NEO

      By Dose Pipe Sutututu 路 Posted

      BOVs do have a purpose, if you ever log pressure before and after the throttle body, you will see a spike pre throttle on lift off from a WOT condition. Enough to bend throttle blades / damage e-throttle motors or simple assist in blowing off cooler pipes. FWIW, the above on really applies to those running at least 2 bar of boost. OP shouldn't have an issue, on the other hand, here are some videos of my shit box over a decade ago with some succulent dose with the airbox on and off. That shit box is unrecognisable these days 馃珷    
    • Yeetus
      Question about BoV on RB25DET NEO

      By Yeetus 路 Posted

      I've tried all different combinations of BOVs/ no BOV and stock bypass valves over the years, on gear changes the stock bypass valve seems to get the car back on boost quicker because in part the turbos wheel speed isn't being slowed down by reversion, although they have issues holding boost much over the stock setting. Most aftermarket BOVs you can adjust the spring, tighter will make it open later and close sooner, but in my experience it'll cause a bit of flutter at low load/rpm anyway. I've also got some input into this whole no bov causing turbo wear, never had an issue on any on my turbos HOWEVER, I got my R33 GTST with 200k kms on it, with from what I can see still has the original turbo, no lateral shaft play but has about 4-5mm of play in and out which to me seems like a worn thrust bearing from years (100-150k kms?) of turbo flutter running no bov, so maybe there is some truth to it in the long run. But that'll never stop me loving the Stutututu while I have the car.   OP just wants to know if he can run a atmo vented BOV with no major issues and the answer is YES, plenty of people do it, there's no harm in installing it and seeing how it runs before spending $$$ on an aftermarket ecu, last time I bought a Nistune it was $2400 for install and a tune , unsure of todays prices but you get me. Crazy money to spend just to fix the minor inconvenience of stalling that can be overcome by letting the revs come down to near idle before putting the clutch in or a little bit of throttle to avoid it. You're better off leaving the ecu and tune for after a bigger turbo/injectors have been installed to take full advantage of the tune and get your moneys worth.   Let OP have his Whoosh sound without trying to break his bank haha
脳
脳
  • Create New...