DiscoWeb Message Boards
 

Go Back   DiscoWeb Message Boards > DiscoWeb Technical Boards > Discovery - Technical Discussions

Reply
 
Thread Tools Display Modes
  #1  
Old 12-18-2018, 01:06 PM
jhk07's Avatar
jhk07 jhk07 is offline
Member
 
Join Date: Jul 2006
Location: Seymour Indiana
Posts: 618
Low mileage on plugs and wires. I'm leaning on upstream o2 sensor bank 1.



Have had codes for that sensor as well, thinking now it's soo fouled up, it's causing a misfire


That drivers CAT has been fried for years (don't care, not replacing).



This misfire is intermittent, but becoming more frequent. Sound like a good start ??



Long time no post gents. Cheers
__________________
JHK
2000 DII
Amigo Free
Stock Drive Shaft w/ 4 zerks

1959 SERIES II 88
1983 Datsun 720 King Cab 2WD
Reply With Quote
  #2  
Old 12-18-2018, 03:24 PM
Swedjen2 Swedjen2 is online now
Almost There...
 
Join Date: Sep 2018
Location: California
Posts: 47
Member Trucks
I would think for the ECU to put out the proper signals, it has to be recieving good data, therefore, if one of your CATS is junk, both O2 sensors will be reading out of spec bad data and sending that to the ECU. The CAT may be partially plugged and or broken causing turbulance upstream and downstream.
I have 90 RRC and had to get one of my CATs replaced to pass emissions so I could get it registered in Calif. It was $350 for a new one and that's in San Jose...not a place known for low labor rates. With the new CAT, my hydrocarbon emissions were cut in half, the CO became unmeasureable and it idles better. The SMOG shop owner said it has the emmisions of a new Honda. 6 HHC / 0 CO. (The engine was rebuilt 15 years ago then sat for the next 13. It has less than 10K on it.) I would spring for a new CAT, then Bob's your uncle.
Reply With Quote
  #3  
Old 12-18-2018, 03:38 PM
jhk07's Avatar
jhk07 jhk07 is offline
Member
 
Join Date: Jul 2006
Location: Seymour Indiana
Posts: 618
Hmmmm ............. Maybe beat the cat converter with a Rubber mallet first.


It's been fouled for over 100k miles. (first HG job, 2006 ish ???)




I know it's not the best way, but I just can't justify spending too much more on it.
__________________
JHK
2000 DII
Amigo Free
Stock Drive Shaft w/ 4 zerks

1959 SERIES II 88
1983 Datsun 720 King Cab 2WD
Reply With Quote
  #4  
Old 12-18-2018, 04:45 PM
squirt's Avatar
squirt squirt is offline
Member
 
Join Date: Nov 2008
Location: Los Angeles
Posts: 787
So what's the question here? Are you asking for advice on what to do?

It sounds like your issue is isolated to bank 1. Since you're already suspecting bank 1 O2 sensor (and apparently don't want to spend any money), I'd suggest swapping the upstream O2 sensors side-to-side. Then drive for a while and see if the misfires follow. If so, I'd recommend replacing both upstream O2's with Bosch replacements. You can be cheap and try to replace just 1 with a $15 3rd party knockoff, but you'll end up buying the Bosch sensors to actually fix it in the end, so don't waste your time.
Reply With Quote
  #5  
Old 12-18-2018, 04:49 PM
jhk07's Avatar
jhk07 jhk07 is offline
Member
 
Join Date: Jul 2006
Location: Seymour Indiana
Posts: 618
Just wanted to confirm I was headed in right direction, that's all.



Bosch for sure. I will splurge THAT much. Thank you
__________________
JHK
2000 DII
Amigo Free
Stock Drive Shaft w/ 4 zerks

1959 SERIES II 88
1983 Datsun 720 King Cab 2WD
Reply With Quote
  #6  
Old 01-09-2019, 01:17 PM
jhk07's Avatar
jhk07 jhk07 is offline
Member
 
Join Date: Jul 2006
Location: Seymour Indiana
Posts: 618
Beat Kat with rubber mallet, then it ran in open loop a few days. No Misfire(s) since. No more open loop either after it had time to adjust.
__________________
JHK
2000 DII
Amigo Free
Stock Drive Shaft w/ 4 zerks

1959 SERIES II 88
1983 Datsun 720 King Cab 2WD
Reply With Quote
  #7  
Old 01-10-2019, 05:20 PM
mlnnc's Avatar
mlnnc mlnnc is offline
Member
 
Join Date: Mar 2008
Location: Charlotte
Posts: 182
Replace the upstream O2, as you plan to do. The only thing shared by all the cylinders on each side is the O2 sensor. Happened to me 4? years ago, and my truck didn't ever throw an O2 code (in that instance ).

If you want to confirm the O2 is the problem try swapping the upstream O2s side-to-side. If the misfires move to the even-numbered bank the O2 diagnosis is confirmed.
__________________
'99 DII, STI wires, Champion 7070s, '04 CDL & SLABS, Garvin WILDERNESS rack, GROM Bluetooth, painted headliner, air springs victim, headgaskets @ 109,000, plus victim of XYZ (twice) and other crazy DII failures. AMIGO FREE since Feb 2011.

Runs like a top; now if I could just afford the gas!
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
P0305, P0300 - Cyl 5 misfire and random cyl misfire yoface13 Discovery - Technical Discussions 38 09-24-2013 07:33 PM
04 d2 - misfire cyl 6 grips03 Discovery - Technical Discussions 9 10-09-2010 09:02 PM
Misfire??? DevilDisco Discovery - Technical Discussions 0 12-17-2009 01:27 PM
A possible misfire dmcfan Discovery - Technical Discussions 3 04-11-2006 09:46 AM
misfire porkchop Discovery - Technical Discussions 6 05-07-2004 08:05 PM

» Log in
User Name Not a member yet?
Register Now!
Password
» Today's Birthdays
RealtorGuy
greendisco1 (41)
xmustang420 (33)
Powered by vBadvanced CMPS v3.2.3

All times are GMT -4. The time now is 04:01 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 2000 - 2015, DiscoWeb.org. All rights reserved.

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.