Been having this problem since 80k. Thanks for the fix!

 

Can't open the Facebook link without an account but thanks for the tip regardless.

 

I'm with @LeVeL on this. I don't have a Facebook account (nor am I ever likely to get one given the way they are) but I'd love to see more info about this, I've definitely seen the problem in a number of Ecoboost cars and I know they don't like topping off. It would be great to see how it's done!

 

Here is diagram @Oreo posted in another post on the evap purge valve

 

I've noticed this in my FFS as well. A stumble in the idle, but no other issues when driving/moving.
I thought it was almost intentional as if the motor was checking/testing octane (triggered by the fuel guage going up, meaning new gas was added).
What is this part and what is the root problem?

Many thanks by the way!

 

As part of the emissions control there is an evap purge/containment system attached to our tanks. It's purpose is contain vapors from our tanks. When we top off, we can get too much liquid in this system designed for vapors, which does not let the tank "breath" correctly. This breathing problem can cause the engine to stumble. After a time this purge valve can only take so much liquid and will quit working correctly. This is layman's terms. I am sure there is a more technical description for the issue

 

I don't "top off".

 

Ford parts catalog didn't even show this as a purge valve when I looked at it. It was labeled as something like fuel support bracket. But it's the purge valve. Just looks different from other Fords/EcoBoost applications.

 

And they say it does not fit my car.

 

Mine started doing it a few weeks ago, figure I'll have to chase one down before it gets really bad ,and starts hard after filling up like my 13 did.

 

I've been noticing sometimes rough idling (like when sitting in car for a few minutes to let engine warm up from cold start). But I don't fill up to the max, maybe 3/4 full. Would this be the same or different problem?

thanks,

 

How rough of an idle are we talking? Mine occasionally has slightly jumpy idle (just barely enough for me to hear the changes in RPM) since new, but nothing crazy. I also never top-off, causes way too many issues.

 

Like Shawnski said it is rough enough to make you think it may actually stall out/die. The 2.7 just seems to be a bit on the rough side with idle but it could also be the RMM amplifying normal operation.

 

Very rough. I’ve had mine nearly stall out.

I’ve never had it last more than a couple minutes because I usually fill up then drive a significant distance before stopping.
It happens when I fill up by leaving the pump handle locked and allowing it to automatically shut off when it’s full. It’s not “topping-off” in the sense of feathering the pump handle to fill beyond the auto shut-off, just a normal fill up. I always fill my tank fully (except on a race day where I might keep it to 1/4 full) because I’ll typically drive out an entire tank in one trip. Often, I’m going somewhere that my schedule, the distances, and available fuel stops are such that filling up is the best way to manage my time.

 

Yeah the 2.7 is definitely not a smooth idling engine (feels like it's a tuning thing tho, in the way it bounces around). Didn't realize a rough idle was actually common already for some of you guys.

Sent from my SM-G986U using Tapatalk

 

There's gotta be something else going on. My car does not have a noticeable rough idle and I am at 46k miles and run Torrie's 93 and E30 tunes. I will say that when I watch the rpm on the SCT, it jumps around 25-50 rpm, but I don't notice it. I theorize that maybe those with a rough idle may have carbon deposits on their intake valves.

 

I see the same thing, maybe 25-50 RPM slight variation, more so when it's cold usually and it mostly goes away once warmed up (which doesn't take long). It's not enough to concern me at all, and it's really not even noticeable except I always watch for that sort of thing and usually have data logging happening. Someone just casually sitting in the car would probably never notice it in mine.

 

I’ve always had a rough idle since day one. Mild at first, then it got worse as I did more mods. After switching from LMS to SCT this spring, it improved a bit. That said, I’ve also had the Wynn fuel system flush and valve cleaning done twice resulting in very mild and temporary improvement in idle quality, improvement in throttle response, and notable improvement in fuel economy. Others experience may vary especially since my car is so far from stock and fuel quality in this part of Ohio and my territory in the Allegheny Mountains just sucks out loud.

 

I bump my idle up to around 620 625, seems to do the trick with the lumpy stock idle at 600 being a bit to low maybe. It also depends on how warm the engine is, morning starts seem to be the worse, but after that it think its pretty smooth

 

My start up idle is 1100 rpm, after about a minute drops to 700. I think Torrie bumped it up on the tunes

 

Idle quality is really a matter of tuning, I,ve written tunes that were smooth as glass, and the next one idles like an old diesel. Fueling will play into the idle, as will timing.

 

Just got this in the mail, and hopefully installing tonight!
Will update after a fresh full tank of 93.

 

I changed mine 10 days ago and I’ve filled up twice since with no choking & stumbling as before. Idle is still a bit…crunchy. But I believe it’s definitely a tune thing that’s being exacerbated by the solid trans and motor mounts.

 

Nice - looks like a 1 beer job.
I know it's hard to quantify, but how much 'shake' does your car have with the solid mounts? Still family friendly?
I usually end up putting Poly motor/trans in my cars, and love how stiff they are for a few weeks. Then they start feeling 'soft', and I regret not doing solid...

 

I guess it depends on your family, but mine complains about it constantly. I’d say the motor mount was not a problem but the trans mount transmits a lot of vibration and noise into the cabin.
I guess the fact that early reviews and customer feedback on the FuSport featured complaints that the transmission shifted too harshly in Sport mode (!?!) is an indication that the average passenger is not going to like the feeling of mechanical connection that we prefer.

 

Have any of you had it actually stall out from this. I’ve been dealing with this. I came up to a stop sign and it stalled out. I just replaced the purge valve solenoid but I can’t find anything about stalling out from this. Almost a week later after it stalled(today) it threw a code P0496 Evap high purge flow. I can’t really find this with anyone else

 

I've been topping off every fill up since 2018. But just 1 click as it adds about 0.2 gal extra before it starts to spit out the filler