Nissan Pathfinder problem - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old Dec 22nd, 01, 05:30 AM Thread Starter
Senior Tech
Mike H
 
Join Date: Jun 2000
Location: Houston, Texas USA
Posts: 293
Question

I know, it's not a Camaro, but hey, i need to keep my daily driver running in order to afford to keep my Camaro looking nice!

I have a 1991 Nissan Pathfinder with 111k miles, V6 engine. When the car runs fine, it purrs like a kitten. No smoke out back or anything like that.

Anyway, the problem is an irratic one. Once in a while the rpm's go way down and then shoot way up. Recently was idling so poorly it almost would stall at stop lights. Black smoke was coming out back also.

I pulled the plugs and all 6 of them were completely covering in black soot. Not wet, like oil, but i suppose carbon.

I cleaned the plugs up and the car runs just fine again. I'm pretty stumped, cause everything seems to be in order and running well, and then out of the blue, this happens.

I thought maybe the O2 sensor or idle mixture, but just not sure...
I believe these cars are computer controlled and dont need mixture adjustment.....

PLEASE HELP!

thanks in advance,
mike




------------------
My '69 Camaro Convertible
mr69 is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old Dec 22nd, 01, 07:05 AM
Senior Tech
 
Join Date: Jan 2002
Posts: 505
Post

Check the coolant temp sensor..It may be speratically sending a "cold" signal to the ECU, therefore causing a rich mode by added more fuel..when it starts running poorly, disconnect the coolant temp sensor ECT, NOT the sensor for the gauge, this will put the ECU into a preset average temp reading, and the rich mixture should go away, if so, replace the sensor..this is somewhat of a common problem on Jap engines.


Gary
cavemate is offline  
post #3 of 4 (permalink) Old Dec 22nd, 01, 09:33 AM Thread Starter
Senior Tech
Mike H
 
Join Date: Jun 2000
Location: Houston, Texas USA
Posts: 293
Post

thanks gary, ill give it a shot. I checked the codes on the computer and it shows a "55" , which means normal operation. That puzzles me a bit.....

------------------
My '69 Camaro Convertible
mr69 is offline  
 
post #4 of 4 (permalink) Old Dec 22nd, 01, 12:19 PM
CZ
 
Join Date: Dec 2001
Location: Hampton, VA
Posts: 21
Post

If you haven't changed the oxygen sensor in awhile, could be the problem. I believe they're good for 60k. When mine went bad, the rpms would surge and dip and it would cut out at stoplights.
CZ is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome