Jump to content
Please check your junk folder for registration emails ×
  • Current Donation Goals

    • Raised $0.00

07 Legacy, delayed O2 AFM Startup.


nickmcgill

Recommended Posts

Hi Team,

 

I've been troubleshooting an issue for awhile with my O2 AFM.

Symptoms is delayed reading of the O2 sensor after startup.

Brand new 4 wire O2 sensor has been installed after the last one appeared intermittent. 

After starting the car it will read at 14.7 for between 8-10mins on average then seems to work as expected. 

 

First we thought that it might be an issue with the heater. 

Jason (gotasuby) and I did some tests and found the ECU wasn't providing an earth for the heater.

After shorting the heater circuit to ground to force it to heat we found the ECU still didn't take a reading from the sensor. 

We were alternating the heater circuit on and off but didn't want to do it for a long period of time to avoid any damage. 

 

Can any other 07~ owners let me know if they have noticed similar behaviour on theirs ? 
Mine will do this regardless if its a cold start or a hot start.

Link to comment
Share on other sites

  • Admin

Yep. Measured the time taken a while back, can't remember exactly, somewhere north of 5mins usually.

Been looking at some logs of another member on here recently regarding unrelated missfires and they had it taking 9+mins. 

Seems extremely weird, had thought a new one might fix it but you've nicely spent the money and saved the rest of us from trying that option ;)

The ECU must have a hard time determining fuel trims without it running. Especially when the engine is up to temp well before it starts reading. Doesn't make sense to me..

  • Like 1
Link to comment
Share on other sites

I also assumed it might be part of the warm up process and run off the other sensors available plus learnt values in the mean time. 

Some said they should be reading in less than a minute, might depend on the make/model. 

 

 

3 minutes ago, Andy_Mac said:

Yep. Measured the time taken a while back, can't remember exactly, somewhere north of 5mins usually.

Been looking at some logs of another member on here recently regarding unrelated missfires and they had it taking 9+mins. 

Seems extremely weird, had thought a new one might fix it but you've nicely spent the money and saved the rest of us from trying that option ;)

The ECU must have a hard time determining fuel trims without it running. Especially when the engine is up to temp well before it starts reading. Doesn't make sense to me..

My tuner mentioned to me that he thought the fuel trims were a bit weird after doing the tuning, I suspect this is why. 

I was hoping a new sensor would fix it too, hopefully its not needing a new ECU too :(

Link to comment
Share on other sites

37 minutes ago, nickmcgill said:

I also assumed it might be part of the warm up process and run off the other sensors available plus learnt values in the mean time. 

Some said they should be reading in less than a minute, might depend on the make/model. 

 

 

My tuner mentioned to me that he thought the fuel trims were a bit weird after doing the tuning, I suspect this is why. 

I was hoping a new sensor would fix it too, hopefully its not needing a new ECU too :(

On a side note - did you get your gearbox issues sorted? 

Link to comment
Share on other sites

8 hours ago, sobanoodle said:

On a side note - did you get your gearbox issues sorted? 

 

Its a work in progress :)
I've learnt a lot about them over the past couple of months about what they do and don't like. 

It looks like the fluid that was put in might be the problem, but can't confirm this until we swap it out. 

Will be getting a flush done in the next month or so with the OEM ATF or the NZ available equivalent. 

 

I'm hoping its not a valve body problem, although seems very coincidental to have the issues as soon as the fluid is changed. Watch this space.

Link to comment
Share on other sites

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
  • Similar Content

  • Recent Status Updates

    • MrSg9Sti04

      Afternoon team,
      im new to the group first time posting. Im hoping some body can help me get my launch control all dialled in on my link g4x. Ive had the computer and car all tuned from chris at prestige awesome knowlegable guy super happy with the results but now im wanting to get my launch/anti lag all dialled in. Ive been reading multiple different forums etc all with different conflicking information which has made me nervious with what do i listen to this or that if you get what i mean. Now ive started to make myself familiar with my PClink software etc the past few weeks and im eager to learn how to do minor setups or tweaks etc so im not relieing on my tuner so much and obviously saving myself abit hurt in the back pocket. 
      Now back to the question at hand.... Im wondering if theres and one who could please share there knowledge and wisdom with setting all my values, timing, fuel etc when i have launch control armed and engaged, or even a launch tune file they can possibly send me to load onto my tune. Ive figured out the setup of my digital inputs turning launch control on etc and its obvisously on its pre set factory settings. It engages but doesnt sound the greatest or as angry as it should i feel. Hence reaching out to you good buggers. 
       
      Cheers in advance for any info and help yous maybe able to give me.
       
      Cheers Shaun
      · 0 replies
    • Joker  »  gotasuby

      updated your DP's too : hope that's ok!
      · 0 replies
    • Joker  »  SAS

      Updated your DP's to reflect your business page  
      · 0 replies
    • Joker  »  Nachoooo

      Updated your Avatar : couldnt help myself  cheers!
      · 0 replies
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Forum Statistics

    40.9k
    Total Topics
    573.5k
    Total Posts


×
×
  • Create New...