Jump to content

Misfiring 1-3-5 and o2 Sensor B1S1 lean


dabNebula

Recommended Posts

So in the attached image you can see the list of dtcs I have on a 2000 rx 300 AWD

 

I have tested coils and replaced spark plugs on 2-4-6, all should be in perfect shape.

I have tested unplugging the coils I could easily access with the entire intake assembled, which seemed to not affect the idle, leading me to believe that perhaps those spark plugs in the back are no good.

 

I am going to head back out now to work on getting to and replacing the 1-3-5 spark plugs, if I can manage. 

 

1. With the intake and throttle body(s?) removed, is it worth any attempt to remove the o2 sensor from above? I tried from below several times, with PB blaster let to sit overnight, to no avail.

2. As I was taking off the intake filter lid, I could swear that one of the two "vacuum" hoses directly behind it, may have been unattached. I followed the one that is attached and it seems to lead to the Fuel Injector rail for 2-4-6. With this logic, would it make sense that the other tube leads to 1-3-5 injectors, and all this could have been from the vacuum leak causing those cylinders to run lean/misfire?

3. Is there anything else I should check while I have the throttle body's off (and cleaned up beautifully) like the MAF, etc? I do have a multimeter, but I have only tried using it a couple of times and am not 100% on which items to check for which values.

4. Is there anyone here with any insight on what values to check on my Code Scanner's "Live Data"? I found a great OBD2 scanner, but I don't know how to use these tools to verify the fix...

 

My plan now is to replace the 1-3-5 spark plugs, reassemple the intake, verifying all connections are made and see how she runs... but I will work at the o2 sensor or anything else possible, while it's apart.

 

Thank you if you read this! I am new to the forum, as I just purchased this car for my wife, so thanks in advance, if anyone hears this!

 

Steve

rx 300 codes.jpg

Link to comment
Share on other sites

Update:

  • All spark plugs have been replaced.
  • swapped coils from 1,3,5 to 2,4,6. 
  • Replaced A/F B1S1
  • Still getting the A/F sensor CEL and Misfires only on 1,3,5 side.
  • I found that the Throttle Body's may need a gasket replacement, because spraying carb cleaner at it is effecting the idle, so those are next to be replaced.

I am now thinking of checking fuel to the injectors, injectors themselves, fuel filter...

Any other suggestions? 

If anyone knows the specific voltages and/or anything else that could help, please let me know!

 

Thanks

Link to comment
Share on other sites

  • 9 months later...

yes! O2 sensor, new plugs all around, cleaned the intake.. Found that when I took off one of the gaskets, the other one wasn't there!

ordered the two gaskets for each throttle body, and it's been fine since!

Link to comment
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.



×
×
  • Create New...

Forums


News


Membership


  • Unread Content
  • Members Gallery