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11-18-2018, 11:24 PM | #1 |
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Idol rough after filling up gas tank
Past few gas trips car has a fluctuating erratic idle right after running from the fill up. This only happens while the car is stopped and full, idle bounces up and down but engine doesn't stall. After 5 minutes of driving it does not happen until the next tank fill. No power issues, 2013 DCT 36k miles. Only use 93 octane and iv tried different gas stations but still happens only after tank is filled for few minutes after. Anyone else have this problem?
Last edited by Ringtaxi; 11-18-2018 at 11:42 PM.. |
11-19-2018, 02:24 AM | #2 | |
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It's the fuel tank breather/purge valve. $90 part. https://www.ecstuning.com/b-genuine-...e/13907838281/ Located under the intake plenum. Consider changing it when you're doing your TAs so you kill two birds with one stone. |
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11-19-2018, 10:54 AM | #3 | |
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11-19-2018, 11:18 AM | #4 |
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No relation to throttle actuators.
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11-19-2018, 07:13 PM | #5 |
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11-19-2018, 10:37 PM | #8 | |
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11-20-2018, 05:32 AM | #13 |
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Here is the DIY
DIY: Replace Fuel Tank Breather Valve (Fix for bouncing idle at fuel station) https://www.m3post.com/forums/showthread.php?t=1273927 The comment on replacing the actuators is more that once you have the plenum off, replacing the actuators is not much more work. I am not aware of significant issues with 'living with it'. Stalling is more of an annoyance, unless you plan to be the getaway car! |
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11-21-2018, 12:41 AM | #14 |
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I never overfill the car! Once the pump clicks I stop. To hear this is from overfilling isnt correct because I’ve never put gas to the point it spills out. I think I will live with it until TAs need replacing because it doesn’t affect the car while driving only a short time while vehicle is stopped after tank is full.
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11-21-2018, 01:10 AM | #15 |
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You should never fill it to this point as you can damage components in the fuel system.
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11-21-2018, 06:51 AM | #16 |
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If I remember the progression of stalling in my car correctly, initially it only occurred after a fill up. It didn't happen every time. Then it happened just about every time. Then occasionally it would stall well after a fill up.
It is something that can be addressed with service that requires removing the plenum. The part isn't expensive, only tricky part is removing the back hose. |
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11-22-2018, 10:21 PM | #17 |
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Let me translate...
When you need major service that involves removing the plenum, also do the fuel tank breather valve at the same time. Replacing the $60-90 part alone isn't worth the cost of the 4-5 hours of labor. Since you have such low mileage, do the spark plugs/air filter or leaky valve cover gasket replacement and fuel tank breather valve at the same time. Spark plug service interval is 37k miles, which is crazy for platinum plugs. Use OE NGK plugs and gap them, instead of the BMW OEM p/n. Same exact part and save $$$. You will likely have to replace the throttle valve actuators around 60-80k miles like clock work, but no need to wait. As a test, only fill your gas tank up to 3/4 or 1/2 tank, and see if the idle problem persists. Issue might just pop up when you fill it to FULL. Not about overfilling the tank, which is not really possible. Just a flakey fuel tank breather valve part we all have to deal with. I think Bosch makes/sells the same part. Do all this work at a good BMW Indie shop instead of the BMW dealership. Simple routine maintenance. Cheers |
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11-23-2018, 01:10 PM | #18 | |
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