Canister Purge Valve Idle Vacuum - Cadillac Forum - Enthusiast forums for Cadillac Owners

US Emissions Have a question about getting your car to pass a state emissions test? Ask here.

Canister Purge Valve Idle Vacuum

Reply

 
 
 
  #1  
Old 09-13-2017, 08:35 PM
Junior Member
Thread Starter
Join Date: Sep 2017
Posts: 2
Default Canister Purge Valve Idle Vacuum

Hello all,

I have a check engine light on my 2007 CTS 2.8L for P0496 which points to the purge valve in the EVAP system. Heres what i have done to troubleshoot:

Replaced the purge valve with a new one from Auto Zone. Code remains. At this point i was unsure what to do so I took the car into the shop and they performed a smoke test - I was told they found a leaky purge valve. I took the car back and got the part replaced by Auto Zone, since it was brand new and believed to be faulty. I installed the new purge valve and the code remains....

With the engine warm and at idle I disconnect the hose going from the purge valve to the engine intake, engine starts to sputter and i can feel a vacuum on the hose - so i know the engine is pulling. Reconnected that hose. Now I remove the hose going into the purge valve. I can feel a vacuum and hear the pulses. With this hose disconnected I removed the electrical connector and the pulses stop, as well as the vacuum.


My question is should the purge valve be open during idle? From what i have read it should be closed. None of the electrical wires look to be frayed and I'm hoping the shop was accurate with their smoke test, so there are no leaks elsewhere.

Any ideas? I'm not sure where to go from here.
 
Reply With Quote
  #2  
Old 09-13-2017, 09:25 PM
Junior Member
Thread Starter
Join Date: Sep 2017
Posts: 2
Default

Is it possible to move this thread to general tech?
 
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Keys85
Private For Sale/Trade Classifieds
0
04-02-2015 02:54 AM
orangecountycruiser
Cadillac Coup DeVille
0
06-13-2011 02:31 PM
fabes
General Tech
11
10-29-2009 01:05 AM
malibuandryan
Cadillac Deville
1
10-16-2007 08:02 AM
wayne1234
Cadillac STS
1
09-28-2007 02:04 PM


Thread Tools
Search this Thread
Quick Reply: Canister Purge Valve Idle Vacuum


Advertising
Featured Sponsors
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

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.