Jump to content
SAU Community

R34 Gtr O2 Sensor Problem?

sr20dettttt
 Share

Recommended Posts

sr20dettttt Enthusiast

sr20dettttt

Posted
Posted

Hi,

Car is running rich and not smooth (acceleration, hesitation etc). I am thinking it's the o2 sensors.

My car is a r34 gtr and it currently has a power fc installed and tuned recently.

First question, when dyno tuning, do the tuners take into account the o2 sensors?

I decided to disconnect both o2 sensors and went for a drive, it feels perfect!

Second question, driving without o2 sensors connected, is it bad for the engine? (my car is running rich with the sensors connected anyway, i dont have any way to check air fuel ratios)

Thirdly, can I conclude that the o2 sensors are faulty?

Finally, I want to replace my o2 sensors anyway... I know I need the zirconia ones. Both sensors are they same right? Just different plugs? (One square, one oval?) Can someone please point me to a link or a place to buy a pair of them?

Thanks alot guys!

Link to comment
https://www.sau.com.au/forums/topic/458174-r34-gtr-o2-sensor-problem/
Share on other sites
breaker1845 Community Regular

breaker1845

Posted
Posted (edited)

You should do some more searching as all those answers can be solved pretty quickly but I can summarize I guess.

1. You have a PowerFC so you should get ahold of the FAQ guide and you can actually go through the menu and check to see if your O2 senors are working from a Hand Controller. When Dyno Tuning, the sensors are either turned on or off basically as they are set to open or closed loop. When they are on they just trim fuel on cruise loads to increase fuel efficiency basically. Research some more if you want to learn more. If your tuner is good you can just turn them off and tune with the sensors and get the results you want anyway.

2. You can test oxygen sensors to see if they are faulty with a multimeter, if you get a very small voltage they are not working, forget what the actual range is. Search for how what values to look for a what wires (of the 3) to check.

3. You need the correct sensors for your GTR, which if it isn't a 32, you use zirconia ones. The 32 ones use a different composite and they don't work for the 33/34. Look up Kudos motorsport as they sell OEM senors. Could source elsewhere from Japan cheaper if you are keen. I wouldn't bother replacing them unless they are actually not working though. Do the test first.

4. Your car should be running rich (not excessive though) so if anything not having an O2 sensor would just make your fuel efficiency worse if it hasn't been compensated for by the tuner and you unplug the sensor. You might get fault codes and other stuff appear but there shouldn't be any real problems as far as I know.

5. Get a wide band for your car so you can measure and read AFR values while driving if you want. Very handy for tuning and detecting fuel issues that may occur. The PowerFC Hand Controller is very useful if you know how to use and read off it. Wouldn't suggest making any changes as they are only temporary from the controller anyway, but good to understand what you can monitor and see in case you have any problems that come up.

In short, you can just ask your tuner if he has it set to closed/open loop or how he set the tune up as he should know. Liked stated in the dot points, the car should run rich but not to a ridiculous point. If you have concerns after fixing/checking O2 sensors raise it with your tuner maybe.

Edited by breaker1845
sr20dettttt Enthusiast

sr20dettttt

Posted
  • Author
Posted

Thanks for that! Haven't had the chance to talk to my tuner yet...

The thing is with the o2 sensors connected.. it is running excessively rich, as in... 250km a full tank on a r34 gtr.

WITHOUT the o2 sensors connected, it is running fine.. and I can see an improvement in millage already. (Haven't finish the tank yet)

I know that running rich is somewhat fine, I just don't want it to run lean.

Think what I'm really asking is.. can I just run my car with the o2 sensors disconnected till I can find new o2 sensors as a temporary fix?

chiksluvit Experienced

chiksluvit

Posted
Posted

If it really is your O2 sensor, you can disable it via power fc hand controller anyway without having to physically unplug it

Some people here don't run O2 sensors including myself provided your tuner has done a good job.

My understanding is that closed loop is only applied during cruising and idle after car warms up, so it shouldn't affect your car too much if you disable it, unless your tune is really off in the cruising cells, which is unlikely but then again no one can confirm that except for your tuner

breaker1845 Community Regular

breaker1845

Posted
Posted

Check your PowerFC first to see if they are even switched on because if they aren't, unplugging them shouldn't do anything.

Also poor fuel consumption may not just be O2 sensors, other components can affect that too. But you did say you had some issues with hesitation and such that you believe is cleared once you disable the oxygen sensors.

If you have time, discussing with your tuner about your level of satisfaction or what you have discovered about the tune may also help if it was recently done.

You won't run lean disconnecting the o2 sensors either if that is your concern. You can order new sensors if you want from Kudos and they usually arrive at your door within a few days.

If the sensors are buggered (you can check readings from PowerFC or manually) then effectively if they are on and you disconnect them it would be beneficial, which I suspect could be your case.

sr20dettttt Enthusiast

sr20dettttt

Posted
  • Author
Posted

http://www.ebay.com.au/itm/Front-NTK-OXYGEN-O2-SENSOR-NISSAN-R33-R34-GTR-RB26DETT-lambda-oxy-cyl-4-6-/111455121782?pt=LH_DefaultDomain_15&hash=item19f33e3176

Can someone please confirm that these are the sensors I need?

Front and rear sensors are the same but different plug design.

I need to order two of them, however because of the plug design, I have to cut and connect to existing plugs?

Thanks guys. Once I get a response, I'll order them right away.

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

http://www.ebay.com.au/itm/Front-NTK-OXYGEN-O2-SENSOR-NISSAN-R33-R34-GTR-RB26DETT-lambda-oxy-cyl-4-6-/111455121782?pt=LH_DefaultDomain_15&hash=item19f33e3176

Can someone please confirm that these are the sensors I need?

Front and rear sensors are the same but different plug design.

I need to order two of them, however because of the plug design, I have to cut and connect to existing plugs?

Thanks guys. Once I get a response, I'll order them right away.

Check with your tuner first. When my Link was installed the O2 sensor was removed as the ECU takes care of the idle and cruise. You may not need to spend the money.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Never used O2s, only had them there to keep the Poleeece happy.

A decent tuner will tune better than what the O2 will provide in terms of "trim" etc. So go back and talk to them. Don't go spending money if you don't need it, and really, you shouldn't.

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

    • sinn3r
      R34 Skyline climate control unit transistor

      By sinn3r · Posted

      Hi all,   long time listener, first time caller   i was wondering if anyone can help me identify a transistor on the climate control unit board that decided to fry itself   I've circled it in the attached photo   any help would be appreciated
    • Kinkstaah
      Blue slip

      By Kinkstaah · Posted

      I mean, I got two VASS engineers to refuse to cert my own coilovers stating those very laws. Appendix B makes it pretty clear what it considers 'Variable Suspension' to be. In my lived experience they can't certify something that isn't actually in the list as something that requires certification. In the VASS engineering checklist they have to complete (LS3/NCOP11) and sign on there is nothing there. All the references inside NCOP11 state that if it's variable by the driver that height needs to maintain 100mm while the car is in motion. It states the car is lowered lowering blocks and other types of things are acceptable. Dialling out a shock is about as 'user adjustable' as changing any other suspension component lol. I wanted to have it signed off to dissuade HWP and RWC testers to state the suspension is legal to avoid having this discussion with them. The real problem is that Police and RWC/Pink/Blue slip people will say it needs engineering, and the engineers will state it doesn't need engineering. It is hugely irritating when aforementioned people get all "i know the rules mate feck off" when they don't, and the actual engineers are pleasant as all hell and do know the rules. Cars failing RWC for things that aren't listed in the RWC requirements is another thing here entirely!
    • GTSBoy
      Best place to order Authetic R32 Parts in Japan

      By GTSBoy · Posted

      I don't. I mean, mine's not a GTR, but it is a 32 with a lot of GTR stuff on it. But regardless, I typically buy from local suppliers. Getting stuff from Japan is seldom worth the pain. Buying from RHDJapan usually ends up in the final total of your basket being about double what you thought it would be, after all the bullshit fees and such are added on.
    • GTSBoy
      Ethanol Content Sensor - Always at 11%?

      By GTSBoy · Posted

      The hydrocarbon component of E10 can be shittier, and is in fact, shittier, than that used in normal 91RON fuel. That's because the octane boost provided by the ethanol allows them to use stuff that doesn't make the grade without the help. The 1c/L saving typically available on E10 is going to be massively overridden by the increased consumption caused by the ethanol and the crappier HC (ie the HCs will be less dense, meaning that there will definitely be less energy per unit volume than for more dense HCs). That is one of the reasons why P98 will return better fuel consumption than 91 does, even with the ignition timing completely fixed. There is more energy per unit volume because the HCs used in 98 are higher density than in the lawnmower fuel.
    • GTSBoy
      Blue slip

      By GTSBoy · Posted

      No, I'd suggest that that is the checklist for pneumatic/hydraulic adjustable systems. I would say, based on my years of reading and complying with Australian Standards and similar regulations, that the narrow interpretation of Clause 3.2 b would be the preferred/expected/intended one, by the author, and those using the standard. Wishful thinking need not apply.
×
×
  • Create New...