Notices
86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Too lean or too rich?

Old 02-26-2019, 06:21 AM
  #1  
Registered User
Thread Starter
 
87-4runner's Avatar
 
Join Date: Mar 2012
Location: Oklahoma
Posts: 444
Received 44 Likes on 42 Posts
Too lean or too rich?

I've noticed that while holding a very steady throttle at certain speeds the check engine light will come on...
if i back out of the throttle for a few seconds then resume my previous speed the check engine light goes off...
do you think it's a too lean message from the 02 sensor or too rich that makes this happen?
87-4runner is offline  
Old 02-26-2019, 07:52 AM
  #2  
Registered User
 
Melrose 4r's Avatar
 
Join Date: Jun 2017
Location: Melrose MA. Right near Boston.
Posts: 974
Received 84 Likes on 62 Posts
Are you storing a code after the CEL comes on?
I am going to guess lean...I think rich might be accompanied by black smoke.
I have a hand held A/F meter that I run on my Camaro which would show in real time but other than the code, or maybe a odd spark plug if rich, I can't think of another way to tell...
Melrose 4r is offline  
Old 02-26-2019, 08:11 AM
  #3  
Registered User
 
Join Date: Aug 2018
Posts: 284
Received 30 Likes on 29 Posts
Any misfires?
snippits is offline  
Old 02-26-2019, 08:28 AM
  #4  
Registered User
 
Join Date: Nov 2010
Location: Washington
Posts: 10
Received 1 Like on 1 Post
Definitely check the code. It may or may not store a code, so a real time check while running would be essential here, but checking for a code is where I would start. That and a can of Seafoam.

Seafoam:
https://amzn.to/2H5Liob
bigsalty is offline  
Old 02-26-2019, 10:31 AM
  #5  
Registered User
Thread Starter
 
87-4runner's Avatar
 
Join Date: Mar 2012
Location: Oklahoma
Posts: 444
Received 44 Likes on 42 Posts
Runs perfect... just the light comes on... back off it goes away. ... our other 87did this same thing...
it did it on a more regular basis... this turbo 4 runner has only done it a couple of times...

Last edited by 87-4runner; 02-26-2019 at 10:32 AM.
87-4runner is offline  
Old 02-26-2019, 10:34 AM
  #6  
Registered User
Thread Starter
 
87-4runner's Avatar
 
Join Date: Mar 2012
Location: Oklahoma
Posts: 444
Received 44 Likes on 42 Posts
I don't remember how to check code...
87-4runner is offline  
Old 02-26-2019, 11:10 AM
  #7  
Registered User
iTrader: (-1)
 
Join Date: Dec 2012
Location: Colorado
Posts: 4,327
Likes: 0
Received 100 Likes on 94 Posts
From memory, KNK, vss, and EGR temp are running codes.
Co_94_PU is online now  
Old 02-26-2019, 12:02 PM
  #8  
Registered User
 
Join Date: Sep 2007
Location: San Francisco East Bay
Posts: 6,692
Likes: 0
Received 129 Likes on 113 Posts
Originally Posted by 87-4runner View Post
I don't remember how to check code...
Hmm ... That's pretty basic.
http://web.archive.org/web/201211190...85diagnosi.pdf
15 of the codes are stored in memory, including 25 and 26.
scope103 is offline  
Old 02-26-2019, 05:47 PM
  #9  
Registered User
 
wallytoo's Avatar
 
Join Date: May 2013
Location: nh
Posts: 851
Likes: 0
Received 37 Likes on 37 Posts
Originally Posted by scope103 View Post
Hmm ... That's pretty basic.
http://web.archive.org/web/201211190...85diagnosi.pdf
15 of the codes are stored in memory, including 25 and 26.
sorry, there are no codes 25 and 26 for 1987 models. there aren't even 15 total codes available.
wallytoo is online now  
Old 02-26-2019, 05:57 PM
  #10  
Registered User
 
Join Date: Sep 2007
Location: San Francisco East Bay
Posts: 6,692
Likes: 0
Received 129 Likes on 113 Posts
Originally Posted by wallytoo View Post
sorry, there are no codes 25 and 26 for 1987 models. there aren't even 15 total codes available.
Ah, correct. I don't know much about the older models. Perhaps this will help:
http://www.4crawler.com/4x4/CheapTricks/TroubleCodes/
scope103 is offline  
Old 02-26-2019, 10:52 PM
  #11  
Registered User
Thread Starter
 
87-4runner's Avatar
 
Join Date: Mar 2012
Location: Oklahoma
Posts: 444
Received 44 Likes on 42 Posts
Originally Posted by scope103 View Post
Ah, correct. I don't know much about the older models. Perhaps this will help:
http://www.4crawler.com/4x4/CheapTricks/TroubleCodes/
nice ... thanks for the link... good info
another project in the shop 25 degrees outside, I'll try pulling any codes when it warms up a bit or the shop gets space whichever comes first
it's not a pressing issue...
thank you for the input gentlemen
87-4runner is offline  
Old 02-27-2019, 08:03 AM
  #12  
Registered User
 
Melrose 4r's Avatar
 
Join Date: Jun 2017
Location: Melrose MA. Right near Boston.
Posts: 974
Received 84 Likes on 62 Posts
I used to have a Corolla that intermittently lit the CEL as you've described. I could predict when it was going to happen, highway cruise conditions. It was related to the catalytic converter catalyst being consumed. All else was fine and it ran with no problems. Is your cat original or less than a few years old? The cheap replacement I put on lasted 3 years. The original lasted more than 12.
Melrose 4r is offline  
Old 02-27-2019, 08:47 AM
  #13  
Registered User
Thread Starter
 
87-4runner's Avatar
 
Join Date: Mar 2012
Location: Oklahoma
Posts: 444
Received 44 Likes on 42 Posts
No cat
87-4runner is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Mason Edmison
86-95 Trucks & 4Runners
1
07-14-2018 03:00 PM
FinallyOffRoad
86-95 Trucks & 4Runners
5
02-17-2016 08:39 AM
Spanky
86-95 Trucks & 4Runners
40
05-30-2007 04:04 PM
yoda-g2
95.5-2004 Tacomas & 96-2002 4Runners
8
03-21-2005 09:59 AM
Maverick
95.5-2004 Tacomas & 96-2002 4Runners
9
07-05-2004 01:47 PM


Thread Tools
Search this Thread
Quick Reply: Too lean or too rich?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: