Focus Fanatics - View Single Post - Question about post-cat O2 sensor
View Single Post
Old 07-23-2012, 09:46 PM   #16
BC_ZX3
DTC P0606
 
BC_ZX3's Avatar
 
Join Date: Jul 2007
Fan#: 48751
Location: Vancouver, BC, Canada
What I Drive: 2001 Red ZX3 Turbo

Posts: 2,846
FF Reputation: 86 BC_ZX3 Excellent Standing Member
Buy-Sell-Trade Rating: (3)
Quote:
Originally Posted by Joboo View Post
Besides codes, should I notice any change in performance when removing and plugging vacuum lines?
Since the removal of any vacuum line will admit air into the intake that has not been accounted for by the MAF sensor, you should produce a condition lean enough to cause a stall or low idle.

You should be plugging the vacant intake port, not the line, initially. If you plug the port and the idle improves, examine the fitting, hard plastic line and any other solenoids or valves in the path for leaks.

Another thought: Also check your EGR valve is closing and seating properly. If you apply vacuum to the fitting at the top and release you should hear an audible clunk. Not a definitive test, but at least tells you the spring loaded internal plate is moving. You could also try blocking the EGR intake port entirely.
BC_ZX3 is offline  
    Reply With Quote