Jump to content
Usav8or

Lambda/AFR problems

Recommended Posts

I noticed a couple of weeks ago that my Lambda #1 was not giving any sensor information and the temperature is indicating a constant 32 degrees. Now the #2 Lambda is indicating an AFR around 45-50 at idle. Nothing has been changed in the last couple weeks except for an ECU update. Even then the lambda #2 worked fine. It wasn't until today the it started acting up. Any ideas?

 

Share this post


Link to post
Share on other sites

Thanks, the firmware was the updated and most recent version. I re-updated it and it still is giving me an AFR around 50-60, and up to 120. Is it even possible for it to run so lean?

Share this post


Link to post
Share on other sites

Check you have the latest PClink installed. To check you can go to help - About and confirm this matches the latest on the web 

Share this post


Link to post
Share on other sites

Everything is current and up to date. From looking at the logs the problem started yesterday morning in the middle of an idle run. The only thing I can think of is something with the internal lambda controller was changed when I was configuring the CAN settings for the AIM MXS Strada I purchased.

Share this post


Link to post
Share on other sites

Have you got another sensor you can swap it out with to rule out a bad sensor? If its a LSU 4.9 I've had a few fail and give some very strange readings. 

Share this post


Link to post
Share on other sites

Didnt you have a log attached earlier?  There is no way firmware or PC link could cause what you are seeing.  It looks like sensor 1 has failed.  Sensor 2 is giving funny results but all the dianostics look ok and it seems to be showing some response to AFR.  So on bank two I would be leaning more towards an air leak or a cylinder misfiring on bank 2?

A quick test will be to swap sensors side to side and see what clues that gives.  

Share this post


Link to post
Share on other sites

Thanks, I have a replacement O2 sensor for bank #1 arriving today. I'll see what I get with that and will check for an air leak while its up. Everything appears to be running fine though.

Thanks

https://www.dropbox.com/s/o12jrkwzkio9o99/AFR gone wild.llg?dl=0

https://www.dropbox.com/s/5g18oguau7ov7dt/AFR gone wild.csv?dl=0

So, I've swapped the 2 sensors and the problems follow. #2 goes dead and #1 now indicates an AFR ranging between 45-120. I'm not finding any air leaks either.

 

The new O2 sensor on bank 1 seems to have fixed that problem. Now the one on bank 2 has completely failed and is only heating to 65 degrees. I have 2 more sensors on the way so I'll have a spare.

 

Thanks for the help

Edited by Usav8or
additional information

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...