12-15-2021, 07:19 PM | #1 |
Private First Class
21
Rep 126
Posts |
Idle stumble after filling up
Tried searching for this but didn’t give exact info I needed. My 340i in the past has been topped off with gas a few times and idle would stumble a bit at first red light after filling up and 5 or so miles later it would stop and smooth out. No CEL ever btw.....
So awhile back I made sure never to top off again but despite no more top offs idle still stumbles occasionally at first stop after fill up. Is this more than likely the purge valve or the breather vent valve as far as a replacement t goes? I’ve heard some people use these 2 parts interchangeably when discussing my issue. Also would it be worth it to plug into my bootmod3 to check to see if there is any codes despite no CEL? Something tells me the engine probably is pulling timing until the stumble goes away. Not sure though |
12-16-2021, 11:38 AM | #2 |
Captain
435
Rep 844
Posts |
Had the same problem. My problem was also accompanied by the fuel pump cutting off before the tank was actually full. Theres a few posts on here about it but i'm having a hard tine finding them now. Anyway, this solved my problem. No more post fill up stumbles.
https://www.turnermotorsport.com/BMW...tt=13907643106
__________________
2019 x5 50i - current
2016 340i THP stage 2 - gone but not forgotten. |
Appreciate
0
|
12-16-2021, 02:34 PM | #3 | |
Private First Class
21
Rep 126
Posts |
Quote:
also apparently when you don’t log into bm3 for a long time I guess bootmod forgets your car and programs? After running diagnostics I tried clicking my maps and other functions and the screens were blank!! Before hooking into agent though I did receive a message about updating my agent?? No clue what that means or how to do it |
|
Appreciate
0
|
12-16-2021, 02:38 PM | #4 | |
Captain
435
Rep 844
Posts |
Quote:
__________________
2019 x5 50i - current
2016 340i THP stage 2 - gone but not forgotten. |
|
Appreciate
0
|
12-16-2021, 06:02 PM | #5 |
Private First Class
21
Rep 126
Posts |
So just pony up and put it on without any codes or cel? I guess I could....but I hope the heck it solves the problem. Like I put it on and it still stumbles afterward. That would suck
|
Appreciate
0
|
01-06-2022, 10:06 AM | #7 | |
Private First Class
21
Rep 126
Posts |
Quote:
Too many gas fill up top offs caused this no,doubt. |
|
Appreciate
0
|
01-06-2022, 02:02 PM | #8 |
Captain
435
Rep 844
Posts |
I think letting the tank get too empty may actually effect it more but who knows. Glad you got it sorted. You should be able to replace it in about 3 minutes. easy as pie, just don't snap a hose or connector lol. They are plastic and not flexible.
__________________
2019 x5 50i - current
2016 340i THP stage 2 - gone but not forgotten. |
Appreciate
0
|
01-06-2022, 09:00 PM | #9 |
Private
9
Rep 61
Posts |
I just replaced the tank breather valve and went straight to fill up about 5 miles away. Car still idles rough after a minute…. Talked to my shop and they told me to bring it in so they can reprogram the car. Did you have to reprogram anything after you replaced the part? I never got a CEL and scan shows no codes so there’s nothing to reset.
|
Appreciate
0
|
01-07-2022, 10:39 AM | #10 | |
Captain
435
Rep 844
Posts |
Quote:
__________________
2019 x5 50i - current
2016 340i THP stage 2 - gone but not forgotten. |
|
Appreciate
0
|
01-07-2022, 12:21 PM | #11 |
Private
9
Rep 61
Posts |
Yes rough idle only present right after fill up. Once I drive for a good 5 minutes and I come to a stop there is no rough idle anymore. Very frustrating…having my Indy shop go over the whole car. They think it might be the fuel pumps since my spark plugs were just replaced.
|
Appreciate
0
|
01-07-2022, 12:23 PM | #12 | |
Captain
435
Rep 844
Posts |
Quote:
__________________
2019 x5 50i - current
2016 340i THP stage 2 - gone but not forgotten. |
|
Appreciate
0
|
01-07-2022, 03:22 PM | #13 |
Major General
2950
Rep 5,984
Posts |
Seems to do it a little if switching fuel brands. Maybe there is some lower octane fuel stuck in the hose initially and the ecu adjusting timing to accommodate.
|
Appreciate
0
|
01-08-2022, 12:35 PM | #14 |
Private
9
Rep 61
Posts |
Initially when it happened to me it was every time I switched fuel brands. Now it happens every single time I fuel up and I tried using the same station 3 times in a row and still does it. Then I tried every top tier gas brand and they all do it.
|
Appreciate
0
|
01-08-2022, 04:36 PM | #15 |
Private First Class
21
Rep 126
Posts |
Man I am concerned about breaking something.....I know those two vacuum hoses come off by squeezing them off. Then the other one comes off by prying a tab and then the valve itself I think pulls off of the silencer. Idk I may just have my mechanic do it.
|
Appreciate
0
|
01-08-2022, 04:38 PM | #16 |
Private First Class
21
Rep 126
Posts |
If you replaced the breather valve hopefully it’s on fully.....? But you should of gotten a code saying tank ventilation. I was very hesitant to order the new tank breather valve until I actually saw the tank ventilation code and finally I did see it.i cleared it through BM3. So if you got NO codes that is odd.....it could be something else.
|
Appreciate
0
|
01-08-2022, 09:21 PM | #17 | |
Private
9
Rep 61
Posts |
Quote:
|
|
Appreciate
0
|
01-08-2022, 09:25 PM | #18 | |
Private
9
Rep 61
Posts |
Quote:
|
|
Appreciate
0
|
01-14-2022, 08:54 PM | #19 |
Captain
246
Rep 715
Posts
Drives: 2021 X3 M40i
Join Date: Jun 2012
Location: Santa Maria, CA
|
I had this same problem last year but luckily I'm still under CPO Warranty, so they replaced the Tank Ventilation Valve and I have had no problems since then. Here is the link to the thread I posted detailing the problem and solution if you're interested. Hope this helps:
https://f30.bimmerpost.com/forums/sh....php?t=1792891
__________________
|
Appreciate
0
|
01-16-2022, 07:17 PM | #20 | |
Private
9
Rep 61
Posts |
Quote:
|
|
Appreciate
0
|
01-16-2022, 10:54 PM | #21 | ||
Captain
246
Rep 715
Posts
Drives: 2021 X3 M40i
Join Date: Jun 2012
Location: Santa Maria, CA
|
Quote:
__________________
|
||
Appreciate
0
|
01-17-2022, 11:47 PM | #22 |
Private
9
Rep 61
Posts |
Darn… I was hoping it was a different part. I replaced this already and still have the same issues. Btw, how long did it take for the CEL to pop up after you started noticing the issue? I see you mentioned it was a couple months apart.
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|