Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 10-04-2010, 08:07 PM   #1 (permalink)
Master EcoModder
 
mechman600's Avatar
 
Join Date: Jul 2008
Location: Langley, BC
Posts: 1,228

Fusion - '16 Ford Fusion Hybrid SE
Thanks: 190
Thanked 275 Times in 168 Posts
V6 with 4-O2 sensors question

Quick question:
Generally speaking, on a V6 with 2 upstream and 2 downstream O2 sensors, does the PCM adjust the AFR of each bank independently based on values from their respective upstream 02 sensor, or does the PCM adjust the AFR of both banks together with combined values of the two upstream O2 sensors?
Curious is all.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 10-04-2010, 09:13 PM   #2 (permalink)
EcoModding Lurker
 
Join Date: Nov 2009
Location: New Jersey
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Depends. Most systems I know of adjust each bank (somewhat) independently. But I can imagine a low-end system that doesn't. I'd think that a 4 sensor system uses all 4 sensors; otherwise why have the expense of 4 when 2 will suffice?
  Reply With Quote
Old 10-05-2010, 10:26 AM   #3 (permalink)
Banned
 
Join Date: Feb 2008
Location: california
Posts: 1,329
Thanks: 24
Thanked 161 Times in 107 Posts
There is a long term fuel trim that can adjust the banks or even individual cyls differently but the O2 sensor is involved only if the exhaust pipes are completely separated before the O2 sensors and cats. On most V engines there is a cross over point before the cats.
  Reply With Quote
Old 10-05-2010, 01:36 PM   #4 (permalink)
Master EcoModder
 
mechman600's Avatar
 
Join Date: Jul 2008
Location: Langley, BC
Posts: 1,228

Fusion - '16 Ford Fusion Hybrid SE
Thanks: 190
Thanked 275 Times in 168 Posts
My 3.0L Mazda Tribute has cats inside the manifolds with 2-O2 sensors on each manifold. It also has a third downstream unmonitored (no sensors) cat.
  Reply With Quote
Old 10-06-2010, 01:04 PM   #5 (permalink)
Master EcoModder
 
mwebb's Avatar
 
Join Date: Jul 2009
Location: New York
Posts: 513

no nickname , it's just a car - '04 volkswagen golf tdi
Thanks: 2
Thanked 101 Times in 74 Posts
yes - Bank 1 and Bank 2 are independant

yes bank 1 and bank 2 are independant
they share a common load sensor and fuel supply
but fuel trim correction per bank is unique to the bank

the system will trim on the rear 02 sensors as well

if both banks have long term fuel trim corrections that exceed +/- 10% and are the same
the problem is in load calculation or fuel supply or air supply

if only one bank has such an error , the problem only affects that bank


Quote:
Originally Posted by mechman600 View Post
Quick question:
Generally speaking, on a V6 with 2 upstream and 2 downstream O2 sensors, does the PCM adjust the AFR of each bank independently based on values from their respective upstream 02 sensor, or does the PCM adjust the AFR of both banks together with combined values of the two upstream O2 sensors?
Curious is all.

  Reply With Quote
The Following User Says Thank You to mwebb For This Useful Post:
MrMiata (10-10-2010)
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Converting Cali Civic VX to Fed (lean burn) VX NachtRitter DIY / How-to 83 06-20-2015 11:30 AM
What does the O2 sensor want? thatguitarguy Off-Topic Tech 2 11-25-2009 07:42 PM
O2 sensor thegasman EcoModding Central 3 07-23-2009 06:04 PM
Cleaning o2 (wideband in this case) sensors? Daox General Efficiency Discussion 2 05-20-2009 07:42 AM
Running "Lean" with a Resistor Divider on the Air Temp Sensor steensn EcoModding Central 22 05-16-2008 09:11 AM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com