Discovery II Talk about the Land Rover Discovery II within.
Sponsored by:
Sponsored by:

Multiple misfire?

Old Mar 20, 2024 | 01:43 AM
  #51  
Helias86's Avatar
Thread Starter
|
Three Wheeling
Joined: Feb 2024
Posts: 65
Likes: 3
From: Everywhere; Nowhere.
Default

Not sure if the MAF reading is off or not, nor sure how many pounds per minute is normal.

But one o2 sensor seems like it has low voltage??


 
Reply
Old Mar 20, 2024 | 05:14 AM
  #52  
Extinct's Avatar
Baja
Joined: Feb 2013
Posts: 5,272
Likes: 1,810
From: Lynchburg VA
Default

You can't really tell anything from digital data from an 02 sensor, you need analog data as shown in this video:
$15 elm327 bluetooth module and the free torque app or similar that will chart analog data. You should see the 02s cycling regularly.

This is the best coil/wiring diagram in imho
 

Last edited by Extinct; Mar 20, 2024 at 02:09 PM.
Reply
Old Mar 20, 2024 | 07:28 AM
  #53  
mln01's Avatar
Camel Trophy
Joined: Dec 2009
Posts: 3,883
Likes: 951
From: Charlotte
Default

Extinct, the YouTube link does not work.
 
Reply
Old Mar 20, 2024 | 02:08 PM
  #54  
Extinct's Avatar
Baja
Joined: Feb 2013
Posts: 5,272
Likes: 1,810
From: Lynchburg VA
Default

Originally Posted by mln01
Extinct, the YouTube link does not work.
Thanks for the heads up, fixed!
 
Reply
Old Mar 20, 2024 | 02:40 PM
  #55  
Helias86's Avatar
Thread Starter
|
Three Wheeling
Joined: Feb 2024
Posts: 65
Likes: 3
From: Everywhere; Nowhere.
Default

Originally Posted by Extinct
You can't really tell anything from digital data from an 02 sensor, you need analog data as shown in this video:https://www.youtube.com/watch?v=UNzi30G2_Kk $15 elm327 bluetooth module and the free torque app or similar that will chart analog data. You should see the 02s cycling regularly.

This is the best coil/wiring diagram in imho

Well, It is my current understanding that the o2 sensors for example, will sit at certain voltage values if good, and another value if bad. What I find interesting, is the huge disparity between the two voltage values of the front sensors.
 
Reply
Old Mar 20, 2024 | 02:50 PM
  #56  
Extinct's Avatar
Baja
Joined: Feb 2013
Posts: 5,272
Likes: 1,810
From: Lynchburg VA
Default

Originally Posted by Helias86
Well, It is my current understanding that the o2 sensors for example, will sit at certain voltage values if good, and another value if bad. What I find interesting, is the huge disparity between the two voltage values of the front sensors.
Absolutely incorrect, you need to watch the video.
 
Reply
Old Mar 20, 2024 | 02:55 PM
  #57  
Helias86's Avatar
Thread Starter
|
Three Wheeling
Joined: Feb 2024
Posts: 65
Likes: 3
From: Everywhere; Nowhere.
Default

Originally Posted by Extinct
Absolutely incorrect, you need to watch the video.
oh! Ok! Lol

Been driving all morning, so I'll watch when I get home. Thanks so much!
 
Reply
Old Mar 21, 2024 | 09:09 PM
  #58  
Helias86's Avatar
Thread Starter
|
Three Wheeling
Joined: Feb 2024
Posts: 65
Likes: 3
From: Everywhere; Nowhere.
Default

So... new o2 sensors, and a new MAF sensor, all Bosch units. Misfire persists. Interestingly enough, my intake temps are now showing 40* BELOW 0*f lol

What gives??
 
Reply
Old Mar 21, 2024 | 11:21 PM
  #59  
JohnZo's Avatar
Pro Wrench
Joined: Apr 2021
Posts: 1,411
Likes: 397
From: SE Washington State
Default

-40 deg F is the minimum value of the sensor range. It probably means the sensor is disconnected, or otherwise open circuited (e.g. wire is broken or cut or disconnected). I would get that temperature value (on the Torque app) when one of the wiring splices on the ground wiring became loose. Took a good bit of detective work with the wiring diagrams to track it down.

Maybe time for a new thread?
 
Reply
Old Mar 21, 2024 | 11:22 PM
  #60  
Helias86's Avatar
Thread Starter
|
Three Wheeling
Joined: Feb 2024
Posts: 65
Likes: 3
From: Everywhere; Nowhere.
Default

Originally Posted by JohnZo
-40 deg F is the minimum value of the sensor range. It probably means the sensor is disconnected, or otherwise open circuited (e.g. wire is broken or cut or disconnected). I would get that temperature value (on the Torque app) when one of the wiring splices on the ground wiring became loose. Took a good bit of detective work with the wiring diagrams to track it down.

Maybe time for a new thread?

It is still causing misfires.
 
Reply

Thread Tools
Search this Thread

All times are GMT -5. The time now is 02:00 AM.