Notices
Evo General Discuss any generalized technical Evo related topics that may not fit into the other forums. Please do not post tech and rumor threads here.
Sponsored by: RavSpec - JDM Wheels Central

PCV - broken? Can hear it during idle (back-forth)

Thread Tools
 
Search this Thread
 
Old Jun 19, 2016 | 04:21 PM
  #1  
EVOEvolved's Avatar
Thread Starter
Evolving Member
iTrader: (1)
 
Joined: Aug 2012
Posts: 214
Likes: 2
From: MI
PCV - broken? Can hear it during idle (back-forth)

I am not sure if this is normal, but the PCV is working like a pulse width modulated motor. I can hear it going back and forth at a high rate, i also used a stethoscope to verify where the noise was coming from, and you can hear this bastard going crazy..

Car currently has Kelfords 272's installed and I am not sure because of this if this is normal, I would imagine not at all. it will stop at times, and then starts back up. Thought it was a bad injector at first going through a strange duty cycle, but it is the PCV valve, anyone ever had this issue?
Old Sep 17, 2016 | 01:40 AM
  #2  
Yota Eater's Avatar
Newbie
Veteran: Air Force
iTrader: (12)
 
Joined: Jan 2007
Posts: 59
Likes: 1
From: Ahnald, MO (63010)
PCV should be closed at idle. It should only open during light load on the engine (ie: cruising down the HWY). You have the 272 cams though, so with the less than stock vacuum at idle it probably is the cause the valve opens and closes randomly. What is your vacuum at idle?
On stock cams I usually averaged a pull of 440 mm/Hg (400ft above sea level) at idle (850 rpm).
OEM service manual states the minimum should be 383 mm/Hg at idle (850ish rpm).
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mutantchart5
Mitsubishi TC-SST Discussion
1
Dec 3, 2015 08:51 PM
ProjExtremis
Evo Tires / Wheels / Brakes / Suspension
9
Jul 6, 2014 09:10 PM
smsevo8
Evo Engine / Turbo / Drivetrain
29
Nov 4, 2013 07:50 PM
c_sautter
Lancer Troubleshooting
4
Sep 6, 2007 07:07 PM




All times are GMT -7. The time now is 06:58 PM.