forddieseldoctor Posted August 3, 2016 Share Posted August 3, 2016 I've had 2 vehicles in the last month with gross evap leak codes stored in the pcm that have been caused by the purge valve not opening enough to draw the tank down enough when running the test. The first one was a 12 or 13 F150 with the 3.7. The second one is on an 11 Fusion that just had the recall done by another shop. Anyone else running across this? The F150 took me to school trying to find the leak. I almost put a filler neck in it, even though I couldn't find any smoke coming out. Quote Link to comment Share on other sites More sharing options...
mrbudge Posted August 3, 2016 Share Posted August 3, 2016 Lots of purge valves. Also, if they leak vacuum with the engine running they can set a code for small leak while testing for vapor generation with the engine off. Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted August 3, 2016 Author Share Posted August 3, 2016 I know there is big issues with them sticking open, but I'm talking about them sticking shut or becoming restricted. Quote Link to comment Share on other sites More sharing options...
YukonTyler Posted August 3, 2016 Share Posted August 3, 2016 Have done a couple on the 1.6 Escapes. Not sure if it is the purge valve itself or the check valve as it comes as a complete assy, but either way the result is that the system cannot pull a vacuum. Quote Link to comment Share on other sites More sharing options...
JoeR Posted August 4, 2016 Share Posted August 4, 2016 Yes. I see it a lot on Ford and Chevy trucks. No vacuum generates during the pulldown phase of the EVAP monitor, as you noted, and the PCM interprets it as a Gross Leak. It trips up a lot of techs that diagnose it with a smoke machine and find no leak. Joe Quote Link to comment Share on other sites More sharing options...
Matt Saunoras Posted September 21, 2016 Share Posted September 21, 2016 We see tons of these. A purge valve is actually one of the three parts we stock. I diaged one on a 13 explorer today. Set a DTC P0456 for a small leak. The bleed up rate was out of spec until I pulled the purge valve out and stuck my finger over the end that fits in the intake. Then suddenly my leak stopped. Most of ours fail like yours where they won't draw a sufficient vacuum but they also will not seal completely and cause an excessive leakdown. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted September 21, 2016 Share Posted September 21, 2016 Like everyone else I have seen my share. They usually stick open but I have had at least one, maybe two that would not open... which seems to be the exception. Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted September 21, 2016 Author Share Posted September 21, 2016 Fusions seem to be the big one by us that stick shut. Had that one F150, but all the rest were on Fusions. The other guys in my shop have both had a couple recently too. Quote Link to comment Share on other sites More sharing options...
batmantech Posted September 21, 2016 Share Posted September 21, 2016 FSA 15S34 (canister purge vales) applies to 2010 and 2011 Fusion and Milan. I would bet the part is very similar. Quote Link to comment Share on other sites More sharing options...
forddieseldoctor Posted September 22, 2016 Author Share Posted September 22, 2016 But you only check them for being stuck open if you do it as the directions tell you. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.