e92 starting to buck on warm up

mnester · 05-20-2015, 07:46 AM

Hello, this morning I was merging onto the hwy in 4th and while stepping on the gas a bit, I noticed that the car bucked a couple of times. The car wasn't warmed up yet and when it was, it didn't do it anymore. I do this every day on my commute and haven't really felt any bucking. Any suggestions of what could be the problem? I didn't throw any codes. It might be time for valve cleaning though.

BeastMode335i · 05-20-2015, 10:16 AM

Probably an injector leaking that is just burning off fuel while the car warms up.. I'm having the same thing going on, along with a few hundred others apparently lol..

wepio · 05-20-2015, 10:17 AM

For what it's worth, maybe plugs? I had a turbo car previous to my E92, and it started to stutter under hard acceleration. Turned out to be a bad plug.

My current E92 would stutter on occasion under cold throttle. No problems yet since I changed. Granted, this could all be coincidence. My indie did say intake was a little gummy, but not so bad I needed to blast it yet.

335iOnATuesday · 05-20-2015, 10:59 AM

It's probably an injector like Beast said,

If i start my car and go, it'll "buck" for a few minutes, though if I wait about less than 2 minutes to let it warm up (I usually wait for my TPMS error light to stop blinking..ghettooooo) I have zero issues.

Edit:
I should mention I've replaced all my spark plugs and ignition coils, but not any injectors. When I had a jb4 installed and went full throttle I'd get a misfire on 1 and 3, so I'm assuming its one of those causing an issue. Really gotta fix that soon LoL

ArcticRik · 05-20-2015, 11:02 AM

Same here, I have leaky injector... getting them changed here soon

Gizm0 · 05-20-2015, 11:59 AM

When is the last time you have replaced your plugs? If it's been over 40k miles I'd start there, it's the cheapest route.

mnester · 05-20-2015, 12:03 PM

Thank you for the replies. I have replaced the plugs 10k miles ago with the original Bosch plug's which is why I thought it would be strange if it was the plugs going. I was wondering if perhaps the HPFP is starting to go but that also seems unlikely cause when the car warms up, it runs fine. Should I go ahead and get some injector cleaner?

46m3csl · 05-20-2015, 10:57 PM

Am having the same issues from a cold start, guessing your car also bogs down for the first few mins. I was leaning towards injectors as well or the hpfp?

sna66 · 05-21-2015, 12:25 AM

My bet is on ignition coil

924er · 05-21-2015, 12:30 AM

How u gonna expect to diagnose a problem without fault codes?

mattuojun · 05-21-2015, 12:33 AM

I had a turbo car previous to my E92, and it started to stutter under hard acceleration

MJ80. · 05-21-2015, 12:50 AM

When you guy's say "buck" can anyone elaborate on that. Are you referring to the slight skip that is a slight misfire, or is anyone else experiencing a severe jolt that actually violently jolts the car and the rpm at the same time.

I experienced a very violent jolting at redline when i was tuned, so bad i thought inwas going to head but the steering wheel, the rpm would bounce around and the car would buck violently.

05-20-2015, 07:46 AM	#1
mnester Private 5 Rep 57 Posts Drives: '07 BMW 335i Join Date: Sep 2013 Location: Hillsborough, NC iTrader: (0)	e92 starting to buck on warm up Hello, this morning I was merging onto the hwy in 4th and while stepping on the gas a bit, I noticed that the car bucked a couple of times. The car wasn't warmed up yet and when it was, it didn't do it anymore. I do this every day on my commute and haven't really felt any bucking. Any suggestions of what could be the problem? I didn't throw any codes. It might be time for valve cleaning though.
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05-20-2015, 10:16 AM	#2
BeastMode335i Maximus Decimus Meridius 1130 Rep 4,584 Posts Drives: F30 335i Join Date: Apr 2014 Location: Down South iTrader: (2)	Probably an injector leaking that is just burning off fuel while the car warms up.. I'm having the same thing going on, along with a few hundred others apparently lol.. __________________ F30 335i Melbourne Red Metallic M-Sport Package
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05-20-2015, 10:17 AM	#3
wepio Private 4 Rep 89 Posts Drives: 2009 E92 335i M-Sport 6MT Join Date: Sep 2012 Location: USA iTrader: (0)	For what it's worth, maybe plugs? I had a turbo car previous to my E92, and it started to stutter under hard acceleration. Turned out to be a bad plug. My current E92 would stutter on occasion under cold throttle. No problems yet since I changed. Granted, this could all be coincidence. My indie did say intake was a little gummy, but not so bad I needed to blast it yet.
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05-20-2015, 10:59 AM	#4
335iOnATuesday Second Lieutenant 73 Rep 247 Posts Drives: A Red Blur Join Date: Feb 2015 Location: Boca, FL iTrader: (0)	It's probably an injector like Beast said, If i start my car and go, it'll "buck" for a few minutes, though if I wait about less than 2 minutes to let it warm up (I usually wait for my TPMS error light to stop blinking..ghettooooo) I have zero issues. Edit: I should mention I've replaced all my spark plugs and ignition coils, but not any injectors. When I had a jb4 installed and went full throttle I'd get a misfire on 1 and 3, so I'm assuming its one of those causing an issue. Really gotta fix that soon LoL
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05-20-2015, 11:02 AM	#5
ArcticRik Enthusiast 167 Rep 1,622 Posts Drives: Arctic Metallic E90 335i Join Date: Jan 2011 Location: Orlando iTrader: (11)	Same here, I have leaky injector... getting them changed here soon
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05-20-2015, 11:59 AM	#6
Gizm0 Colonel 426 Rep 2,136 Posts Drives: 08 e92 335i 6mt Join Date: Jan 2013 Location: Virginia iTrader: (1)	When is the last time you have replaced your plugs? If it's been over 40k miles I'd start there, it's the cheapest route.
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05-20-2015, 12:03 PM	#7
mnester Private 5 Rep 57 Posts Drives: '07 BMW 335i Join Date: Sep 2013 Location: Hillsborough, NC iTrader: (0)	Thank you for the replies. I have replaced the plugs 10k miles ago with the original Bosch plug's which is why I thought it would be strange if it was the plugs going. I was wondering if perhaps the HPFP is starting to go but that also seems unlikely cause when the car warms up, it runs fine. Should I go ahead and get some injector cleaner?
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05-20-2015, 10:57 PM	#8
46m3csl Captain 121 Rep 774 Posts Drives: 335i Join Date: May 2010 Location: Rowland Heights iTrader: (0)	Am having the same issues from a cold start, guessing your car also bogs down for the first few mins. I was leaning towards injectors as well or the hpfp?
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05-21-2015, 12:25 AM	#9
sna66 Captain 508 Rep 763 Posts Drives: F83 Join Date: May 2014 Location: South FL iTrader: (0)	My bet is on ignition coil
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05-21-2015, 12:30 AM	#10
924er Colonel 352 Rep 2,050 Posts Drives: e92 335i '10 Join Date: Feb 2014 Location: Socal iTrader: (0)	How u gonna expect to diagnose a problem without fault codes? __________________ '10 e92 N54 DCI intakes, ER chargepipe, TIAL BOV, VRSF 5in FMIC, BMS Downpipes COBB e30
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05-21-2015, 12:33 AM	#11
mattuojun Registered 0 Rep 3 Posts Drives: bmw Join Date: May 2015 Location: m3 iTrader: (0)	I had a turbo car previous to my E92, and it started to stutter under hard acceleration __________________ nice bmw
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05-21-2015, 12:50 AM	#12
MJ80. Major 204 Rep 1,103 Posts Drives: E92 335i DCT Individual Join Date: Oct 2013 Location: Gold Coast, Australia. iTrader: (0)	When you guy's say "buck" can anyone elaborate on that. Are you referring to the slight skip that is a slight misfire, or is anyone else experiencing a severe jolt that actually violently jolts the car and the rpm at the same time. I experienced a very violent jolting at redline when i was tuned, so bad i thought inwas going to head but the steering wheel, the rpm would bounce around and the car would buck violently.
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