Nissan 370Z Forum  

question about maf sensors

Originally Posted by Z_ealot just an update, but I decided to disregard the maf sensors for now and look at the main issue which is the fuel trims indicating a

Go Back   Nissan 370Z Forum > Nissan 370Z Tech Area > Engine & Drivetrain


Like Tree17Likes

 
 
LinkBack Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 07-08-2017, 02:43 PM   #19 (permalink)
Track Member
 
Join Date: Dec 2009
Location: Farmington, Utah
Posts: 582
Drives: 14 SR 370z 6MT
Rep Power: 10140
Dreadnaught has a reputation beyond reputeDreadnaught has a reputation beyond reputeDreadnaught has a reputation beyond reputeDreadnaught has a reputation beyond reputeDreadnaught has a reputation beyond reputeDreadnaught has a reputation beyond reputeDreadnaught has a reputation beyond reputeDreadnaught has a reputation beyond reputeDreadnaught has a reputation beyond reputeDreadnaught has a reputation beyond reputeDreadnaught has a reputation beyond repute
Default

Quote:
Originally Posted by Z_ealot View Post
just an update, but I decided to disregard the maf sensors for now and look at the main issue which is the fuel trims indicating a lean condition. decided to start with the simplest thing I could think of which is the vacuum hoses and pcv hoses and valves. brake booster hose and all other hoses connected to the intake manifold or had anything to do with vacuum checked out visually OK so moved on to spraying around each hose to see if that did anything....nothing. lastly decided to pull off the hoses for the pcv valves and guess what I found.....a nice little puddle of oil on the connectors where the pcv hoses meet with the intake manifold. pulled the hose off the pcv valve itself and same thing so popped one of the pcv valves off for testing and here's the video of what I found.....

http://www.youtube.com/watch?v=P4MulWhuyE0

if I remember right from reading around these valves shouldn't be hissing like that and there should be next to no suction at idle if the valve is operating correctly, can anybody confirm this or am I getting faulty information?

P.S.

when holding the valve in my hand I can feel vibrations coming from it while vacuum is being applied to it.
It sounds like there is a hole in the PCV hose where it meets the intake. This could definitely be why you have been running lean since there is unmetered air entering the engine.
__________________
Ford Diesel and Heavy Line Technician at your service.
Dreadnaught is offline   Reply With Quote
 

Bookmarks


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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[REQUEST] AL Priority "Parking" sensors question Guyfromthere DIY Section (Do-It-Yourself) 4 06-30-2016 04:21 PM
Maf sensors (flowmeters) Question GuiLLoZ Engine & Drivetrain 15 04-17-2015 01:07 PM
Both fwd O2 sensors? SurfDog Nissan 370Z General Discussions 19 07-02-2014 08:53 AM
Getting New MAF Sensors ddvette9 Engine & Drivetrain 6 02-04-2012 07:01 AM
OEM O2 sensors on the Cat gpa7pk Intake/Exhaust 2 08-10-2009 04:03 PM


All times are GMT -5. The time now is 02:27 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2