Slower and hesitation after purge valve recall PCM flash!!
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    FST Member 2017ST3's Avatar
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    Slower and hesitation after purge valve recall PCM flash!!

    Has anyone else had the recall performed for the evap canister purge valve, where they flash the computer?

    My car is now significantly slower and hesitates/bogs. When you gave it throttle before, after a slight amount of turbo lag it would accelerate cleanly and quickly, with torque-steer (and wheelspin through third, if wet). If you floored it on highway in 6th gear, it felt like an automatic kicking down when the boost came on.

    Now it just keeps hesitating and bogging and EVENTUALLY accelerates.

    A guy at work who used to be a Porsche master tech explained what they probably did - will have to get that explanation again. But at the end of the day, he said they leaned it out so under heavy throttle applications, it is starving for fuel.

    This sucks - I feel like they’ve ruined the car. Took away all it’s personality.

    Anyone else have this experience?

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    Super Moderator ddfred's Avatar
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    Situations like this is a reason why I never take my car into Ford for service of any kind. Not that it helps you at all, but I ordered the purge valve and changed it myself after other members had Ford do theirs and reported that there was a programming change as part of the recall.

    Not to be critical of your driving (but I guess I am), you should never floor your turbo charged vehicle in 6th gear unless you are already traveling at a high rate of speed. Low speed pre-ignition will kill your engine.


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  3. #3
    I spend too much of my life on FST! xTheMan42's Avatar
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    From what you mentioned, I think your issue is coming from flooring it in 6th. No one has reported issues with the PCM reflash that I'm aware of.

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    FST Junkie! AK2112's Avatar
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    I had the recall done. Had the pcm updated and my Purge valve replaced.

    No, I don't notice the car hesitating or being slower. The pcm update, to my knowledge, didn't change anything except now the car notifies you via check engine light if the Purge valve has malfunctioned. Nothing more. Someone can correct me if I'm wrong, I'm sure, but I believe that was the extent of it.

    And yeah, like everyone said... 6th gear is not for full throttle. Thats bad news.
    16' Race Red ST1

    Potentially helpful things I've done:

    Huge cold start misfire thread (with buyback info): https://bit.ly/2JGjjy9

    Exterior roof trim removal: https://bit.ly/2LSwskf

    Solving interior creaks: https://bit.ly/2tePB8e

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    I spend too much of my life on FST! GotAFoSTnSpeed6's Avatar
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    As everyone said 6th is not for boost unless your well above 4k rpm to be safe. Secondly I had the update done and uninstalled my accessport prior to taking it in, all they do is what's already been said, check your fuel tank for deformation replace if needed, check the Purge valve replace if needed, and do a quick flash that makes the ecu monitor a set of already existing parameters that are effected by a failing Purge valve that way if it ever happens the CEL will be thrown from now on. They don't change anything per say, are you sure this isnt in your head? What are your mods? Tuned?
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    All: I fully understand about detonation - was using for illustration purposes. In any event and after some more exploration, it seems like rhe car is pulling timing as boost builds or possibly is bypassing, like there’s an obstruction (they DID mess with the charge tube). Opened a case with Ford and it’s going back Monday. Will post if they find something.

    Car is stock except for symposer delete.
    Problem not in head - it’s pretty dramatic.

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    How do you guys know the content of the flash? I am an engineer at an aerospace manufacturer and when we make revisions to drawings, documents or software for one reason, we usually fold some other things in also, since it’s a convenient time to do so. It’s not impossible that there was something else added, with unintended consequences...

    BTW: Flooring in 6th when already going 70-80 mph is ok to do. I wouldn’t and don’t hold it there for an extended period of time, but for 5-10 seconds and above 2500 rpm, it’s fine.

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    Quote Originally Posted by 2017ST3 View Post
    How do you guys know the content of the flash? I am an engineer at an aerospace manufacturer and when we make revisions to drawings, documents or software for one reason, we usually fold some other things in also, since it’s a convenient time to do so. It’s not impossible that there was something else added, with unintended consequences...

    BTW: Flooring in 6th when already going 70-80 mph is ok to do. I wouldn’t and don’t hold it there for an extended period of time, but for 5-10 seconds and above 2500 rpm, it’s fine.

    Even above 2500 rpm i wouldn't floor in 6th gear. If I want to get the 80 quick I'm in third. Your flooring it to go faster why not downshift. I've been 110 and 4th.
    Last edited by G heinrich; 05-18-2019 at 07:49 AM.

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    I don’t generally, but I know how it feels and since that’s the worst case with respect to my problem, I was using it as a baseline comparison.

    Does anyone have any useful input on the actual issue, as appose to accelerating in 6th gear?

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    Quote Originally Posted by 2017ST3 View Post
    Does anyone have any useful input on the actual issue, as appose to accelerating in 6th gear?
    Probably not.

    Sounds like something is screwed up with your car and I'd wager it's not related to the recall pcm update. Do post back on Monday when they give you an idea what's up.
    16' Race Red ST1

    Potentially helpful things I've done:

    Huge cold start misfire thread (with buyback info): https://bit.ly/2JGjjy9

    Exterior roof trim removal: https://bit.ly/2LSwskf

    Solving interior creaks: https://bit.ly/2tePB8e

 

 
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