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2010 2011 BMW 5 Series Forum F10 BMW 5-Series (F10) Forums General 5-Series Sedan and Wagon (F10 / F11) Forum N63tu sputtering when coasting or under very light throttle
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      09-24-2017, 07:54 PM   #1
BlackBear
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N63tu sputtering when coasting or under very light throttle

My N63tu engine has no codes but when coasting or under light throttle the engine feels like it dropped one cylinder and sputters. Full throttle is great as always.

Because there is no code I don't know which cylinder is the problem. My guess is that one coil pack might be bad and is missing just a little bit.

Thank you.
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      09-25-2017, 10:52 AM   #2
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Quote:
Originally Posted by BlackBear View Post
My N63tu engine has no codes but when coasting or under light throttle the engine feels like it dropped one cylinder and sputters. Full throttle is great as always.

Because there is no code I don't know which cylinder is the problem. My guess is that one coil pack might be bad and is missing just a little bit.

Thank you.
What fuel are you using? How may miles are on your car ?
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      09-25-2017, 12:49 PM   #3
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Originally Posted by M5 Monster View Post
What fuel are you using? How may miles are on your car ?

10k miles. Shell.
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      09-25-2017, 03:12 PM   #4
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maybe its spark plugs or coils?
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      09-25-2017, 03:18 PM   #5
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Originally Posted by TheBlackGT View Post
maybe its spark plugs or coils?

I already changed the plugs. New coils have been ordered and are going in this weekend.
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      09-25-2017, 04:15 PM   #6
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i had a similar issue, white smoke was also coming out from my passenger side exhaust, dealer replaced all 4 fuel injectors and plugs on the passenger side bank. i have a 2014 550i

i was getting gas at Safeway, and my SA recommended against it, as he said he's had a few issues with safeway gas on his own 535i. so he now sticks to chevron/76/shell

not sure how much that makes a difference but lets see what happens after a few months of NO safeway gas...
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      09-25-2017, 06:54 PM   #7
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Quote:
Originally Posted by xxpanipuri View Post
i had a similar issue, white smoke was also coming out from my passenger side exhaust, dealer replaced all 4 fuel injectors and plugs on the passenger side bank. i have a 2014 550i
This cracks me up. Both sides of the exhaust are connected so exhaust can be from either bank. With a firing order of 1-5-4-8-6-3-7-2 the 2 back to 1 and 8 to 6 are the only two cylinders that fire on the same side sequentially.
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      09-25-2017, 07:49 PM   #8
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Quote:
Originally Posted by ezaircon4jc View Post
This cracks me up. Both sides of the exhaust are connected so exhaust can be from either bank. With a firing order of 1-5-4-8-6-3-7-2 the 2 back to 1 and 8 to 6 are the only two cylinders that fire on the same side sequentially.
ok so maybe i screwed up the details LOL, i was in the middle of a remodel/move when this happened so details are hazy
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      09-25-2017, 08:11 PM   #9
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Quote:
Originally Posted by xxpanipuri View Post
ok so maybe i screwed up the details LOL, i was in the middle of a remodel/move when this happened so details are hazy
Not saying you did. Saying the "tech" needs to brush-up on the combustion/exhaust process and think through the entire flow of air. After all, an engine is basically just an air pump.

Understand the remodel thing. Our 6-week bathroom remodel took 4 MONTHS!!!
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      09-25-2017, 11:57 PM   #10
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Quote:
Originally Posted by ezaircon4jc View Post
Not saying you did. Saying the "tech" needs to brush-up on the combustion/exhaust process and think through the entire flow of air. After all, an engine is basically just an air pump.

Understand the remodel thing. Our 6-week bathroom remodel took 4 MONTHS!!!
we remodeled a 2700 sqft house in 2 months, I gc'd the entire thing.

3 new bathrooms (took them down to the studs and removed a wall and redesigned the master bathroom)
60 Recessed lights through the house (all led)
Whole House Fan
2nd HVAC For 2nd story
all new paint along with new texture on a bunch of walls etc..
all new flooring
new closet organizers
new shower glass in all 3 bathrooms
Garage textured/painted and floor epoxy done (shitty one for now, will do racedeck or proper epoxy (grind concrete etc later)

Started July 10th, moved in Sept 8th, i'm still not sure how we got it all done in that time, but we did...and the week before we move the BMW gets flat bedded to the dealer, and my trusty DD a 2000 camry v6 with 281k miles on it, also decides that the radiator should blow up (original one btw)

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      09-27-2017, 08:33 AM   #11
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From my past experience on sputtering cars usually it's related to spark/ignition.
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      03-27-2024, 01:40 AM   #12
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Quote:
Originally Posted by BlackBear View Post
My N63tu engine has no codes but when coasting or under light throttle the engine feels like it dropped one cylinder and sputters. Full throttle is great as always.

Because there is no code I don't know which cylinder is the problem. My guess is that one coil pack might be bad and is missing just a little bit.

Thank you.
Hi, did you ever solve this? I have the exact same thing. Sputtering under light throttle, no issues under heavy throttle or sport mode.

Bimmerlink shows me cylinder 6 goes into a misfiring frenzy when I reach cruise speed of around 105 kmph in comfort mode. Any faster or slower and it goes away. I also sometimes get misfires at low throttle after gear shifts from 2-3 and 3-4.

All injectors, coils, spark plugs are brand new. What's even more weird, is the misfiring completely goes away if I disconnect the MAF sensors. The MAF sensors are also brand new..

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