What is causing this stutter?

Kev7274 · 05-07-2026, 02:54 PM

My 09 335i N54 LCI is acting up a little.

At low idle,when I get on it a little,it acts like when you run over those rumble strips on the road,around 1k-1.5k RPM. At 2k Rpms the car runs and pulls fine.

Plugs and Vanos were changed 100 miles ago.

I'm thinking Bad igntion coil or Injector? I don't have any codes and none are pending. Ideas?

lookalikehuuh · 05-07-2026, 03:21 PM

Where did you source the plugs and VANOS solenoids and what brands are they?

Kev7274 · 05-07-2026, 03:42 PM

Bosch zgr6ste2 plugs from Fcp Euro
Coil Packs are Eldor I got from ECS Tuning.

I stand corrected on the Vanos,it was the Boost solenoids I replaced. The Vanos were replaced about 3 years ago. I cleaned them when I replaced the Boost solenoids.

Could they be the issue?

lookalikehuuh · 05-17-2026, 08:45 PM

How old are the ignition coils? I assume your vanos solenids were original BMW ones?

If you rev the engine without it being in gear in that same 1k to 1.5k range, do you also feel the vibration?

turbohugh · 05-22-2026, 02:14 PM

How long since your last confession ? [#WalnutBlast]. Could also be a slight vacuum leak or PCV issue .. Maybe a smoketest is in your future.

Kev7274 · 05-22-2026, 03:43 PM

Low pressure fuel sensor was bad. Things are good now.

05-07-2026, 02:54 PM	#1
Kev7274 Private First Class 27 Rep 163 Posts Drives: 2009 335i M-Sport LCI Join Date: May 2014 Location: United States iTrader: (2)	What is causing this stutter? My 09 335i N54 LCI is acting up a little. At low idle,when I get on it a little,it acts like when you run over those rumble strips on the road,around 1k-1.5k RPM. At 2k Rpms the car runs and pulls fine. Plugs and Vanos were changed 100 miles ago. I'm thinking Bad igntion coil or Injector? I don't have any codes and none are pending. Ideas?
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05-07-2026, 03:21 PM	#2
lookalikehuuh Colonel 1944 Rep 2,270 Posts Drives: 2006 330i, 2007 335i Join Date: Sep 2014 Location: San Diego, CA iTrader: (0)	Where did you source the plugs and VANOS solenoids and what brands are they?
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05-07-2026, 03:42 PM	#3
Kev7274 Private First Class 27 Rep 163 Posts Drives: 2009 335i M-Sport LCI Join Date: May 2014 Location: United States iTrader: (2)	Bosch zgr6ste2 plugs from Fcp Euro Coil Packs are Eldor I got from ECS Tuning. I stand corrected on the Vanos,it was the Boost solenoids I replaced. The Vanos were replaced about 3 years ago. I cleaned them when I replaced the Boost solenoids. Could they be the issue? Last edited by Kev7274; 05-07-2026 at 03:49 PM..
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05-17-2026, 08:45 PM	#4
lookalikehuuh Colonel 1944 Rep 2,270 Posts Drives: 2006 330i, 2007 335i Join Date: Sep 2014 Location: San Diego, CA iTrader: (0)	How old are the ignition coils? I assume your vanos solenids were original BMW ones? If you rev the engine without it being in gear in that same 1k to 1.5k range, do you also feel the vibration?
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05-22-2026, 02:14 PM	#5
turbohugh ASCMA General 57 Rep 178 Posts Drives: E90-N54 <>E36 328Vert Join Date: Nov 2015 Location: Somewhere in Washington DC iTrader: (0)	How long since your last confession ? [#WalnutBlast]. Could also be a slight vacuum leak or PCV issue .. Maybe a smoketest is in your future.
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05-22-2026, 03:43 PM	#6
Kev7274 Private First Class 27 Rep 163 Posts Drives: 2009 335i M-Sport LCI Join Date: May 2014 Location: United States iTrader: (2)	Low pressure fuel sensor was bad. Things are good now.
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