[Bighorns]

Following. I am having the same issues, and am trying to get an idea of what to expect before I take the car to the dealer.
New turbos, new coils and plugs, carbon removal, and I think it's worse.
Stock car, JB4, map 2, usually cuts out in 2nd gear, even half throttle.
Turn off JB4, it's still there but not as harsh.
No codes thrown.
I have no idea what to tell my dealer, other than my symptoms!

[tdli]

Also have the same issue here. Happens more when weather is warmer out (above 65) and jolt happens much less when weather is cooler. Sometimes car will shut off at stop signs or if I stop at a light, RPM will fluctuate. Car throws no codes.

2007, JB4, map 5, BMS DCI, replaced LPFP and DMTL has error code for leakage. I originally suspected it was fuel related, but now it seems like it is more of an electrical issue? My battery is almost 4 years old.

[major330i]

Hey i‘m Fighting the same problem on my e93 330i with n53 Engine.

I have replaced fuel pump (in tank), fuel filter (in tank), HPFP, low pressure sensor, all Injectors (Index 11 now), all coils, all soark plugs, all lambda probes,
Both camshaft sensors and also the ekps module (+coding).

I have light rpm drops and hesitation in accelaration at low rpm and a heavy rpm drop if suddenly accelarate hard while the rpm is about 1000-1500.

I wonder if it might be an battery issue. The voltage of my battery is very low (below 12 V) when only the ignition is on (engine not running).

Next step will be to change the battery and get it coded.

Also thinking about changing the crankshaft sensor and both DISA in the intake manifold.

Hope we manage to solve this issue.

[piterson335]

Same issue here with my 07 335xi with MHD stage 2. It feels like the car hits a wall at around 4-5k rpm and then continues like nothing happened in half of a second. It doesn't happen on a stock map so my guess is the higher boost + clogged intake could be causing this. I also replaced my exhaust vanos solenoid with the 'dorman' aftermarket one, not sure if it can fail under load. No codes or lights, so I doubt this can be an issue. Will be cleaning intake valves soon and report back. I also came across a video on YouTube where the guy had to top up transmission fluid dealing with 'hasitation' issue. Planning on checking atf level as well. If anyone gets this resolved please post an update as this issue is driving me crazy.

[piterson335]

Quick update here. Turned out that transmission fluid was low. The shop said they added about 1 liter. No issues so far.

[Piet Africa]

Originally Posted by piterson335

Quick update here. Turned out that transmission fluid was low. The shop said they added about 1 liter. No issues so far.

Did this sort you out? I have the same issue on my 335i auto. No codes and feels like a total ignition shutdown for a split second 3 to 5 times or until I let off the Throttle. Does exactly what the OP described. I noticed that it occurs more when engine it really hot, but it may be because i never punch it hard when not fully on operating temps, then it does a few pulls with ease and when it does it once it does it with every WOT afterwards when WOT and always above 4500rpm. Car is still stock and 70k miles on.

[mojobmw_e90]

Stupid question but are you people completely turning off your traction? I have the same issue when traction is enabled. One turned off it's a spin fest without hiccups

[Piet Africa]

Originally Posted by mojobmw_e90

Stupid question but are you people completely turning off your traction? I have the same issue when traction is enabled. One turned off it's a spin fest without hiccups

Yep TC totaly off.. it does a few pulls well, first time it happened to me was mid powerslide, Felt like I broke a diff!

[Vt335iguy]

Hi,

I too have this problem and its driving me nuts. Updated firmware on JB4 last night and it went away for a run cycle and then came back strong as ever today. I have done new coils and am about to replace vans tomorrow.

My logs show a throttle drop at about 4000 rpm.

Did anyone resolve this?

Thanks,

Liam

[jwebs22]

Hey all,

I have the same issue, drops power and then comes back a second later, so many options out there to check, is there anyone who found something for sure? No codes being thrown.

Seeing possibilities of low trans fluid, Vanos need cleaning, plugs and packs need to be changed, walnut blast the intake, ect.

Installed: JB4, COI, Charge pipe and BOV, new plugs and coil packs.

[Vania335i]

Hey guys.. sorry to revive an old thread but i started having a similar issue
Car is an 08 335i MT
FBO. Intercooler charge pipe HKS BOV catless DP custom free flow exhaust running MHD 2+ on 98 octane pushing 390whp.
New coils and plugs
The car jolts for a split second on WOT
I can replicate it lets say if im on 3rd gear at 2500 RPM and foor it.. it will start to pull nd at around 3500 4000 RPM it will jolt and continue like normal...i logged on a dyno and could replicate it and the chart shows sudden dron of power and fuel cutoff...
No codes whatsoever even after repeated pulls.
The only problem with my car is i have old index injectors.. which i haven't changed because they haven't given me any priblems... car idles smooth pulls like a freight train
My.mechanic is baffled cause we can't force a code to register... bmw dealer wants to replace a ton of parts just to be safe (lpfp. Hpfp. Throttle body. Coils plugs and injectors) which comes with a hefty bill which will be almost the cars worth.
Any advice

[mxchris727]

I experienced this with mine back in 2016. It wound up being the injectors; I had shorted them out while washing the engine with the ignition cover removed. $800 later (pricing back then) and the car has never had a fault since.

[Vania335i]

Originally Posted by mxchris727

I experienced this with mine back in 2016. It wound up being the injectors; I had shorted them out while washing the engine with the ignition cover removed. $800 later (pricing back then) and the car has never had a fault since.

But wouldn't a fault in the injectors register a code... misfire... rough idle... limp kode... high fuel consumption etc?

[mxchris727]

Originally Posted by Vania335i

But wouldn't a fault in the injectors register a code... misfire... rough idle... limp kode... high fuel consumption etc?

Only fault I had was misfire, injector/fuel deactivation codes. But they rarely came up again after clearing.

[Vania335i]

Originally Posted by mxchris727

Only fault I had was misfire, injector/fuel deactivation codes. But they rarely came up again after clearing.

The weird thing is my car isn't registering any codes... after 2 months now.. with the cut off hsppening several times a day... no code.... no shadow codes either... smooth running values are within norms... it's really frustrating... i want to fix it but without changing every valve .... pump... hose... injectors.... i mean the dealer wants yo change

1.. both boost solenoids
2.. throttle body
3 6 injectors
4.. 6 coils
5. Plugs
6. Hpfp

I mean come on...

[Warishuku]

Originally Posted by Vania335i

The weird thing is my car isn't registering any codes... after 2 months now.. with the cut off hsppening several times a day... no code.... no shadow codes either... smooth running values are within norms... it's really frustrating... i want to fix it but without changing every valve .... pump... hose... injectors.... i mean the dealer wants yo change

1.. both boost solenoids
2.. throttle body
3 6 injectors
4.. 6 coils
5. Plugs
6. Hpfp

I mean come on...

Do you have already any logs from your car? maybe that could point to a narrower list of potential culprits.

Mine normally gets "stuck" at 3500-4000 rpm at WOT, but it never gets higher than that. In my case is a fuel pressure issue (detected by logging).

[Vania335i]

Originally Posted by Warishuku

Do you have already any logs from your car? maybe that could point to a narrower list of potential culprits.

Mine normally gets "stuck" at 3500-4000 rpm at WOT, but it never gets higher than that. In my case is a fuel pressure issue (detected by logging).

Don't have any logs .. and don't know how... if i take it to a dyno will they be able to log?

[jaydieu]

Originally Posted by Warishuku

Do you have already any logs from your car? maybe that could point to a narrower list of potential culprits.

Mine normally gets "stuck" at 3500-4000 rpm at WOT, but it never gets higher than that. In my case is a fuel pressure issue (detected by logging).

Originally Posted by Warishuku

Do you have already any logs from your car? maybe that could point to a narrower list of potential culprits.

Mine normally gets "stuck" at 3500-4000 rpm at WOT, but it never gets higher than that. In my case is a fuel pressure issue (detected by logging).

We're you able to figure out this issue? I'm dealing with something very similar

[OG83]

Hi - first time joining any kind of forum so apologies in advance if I break any protocols or etiquette!

I’ve just bought a F31 330i M Sport touring - manual - 2016 with 77k - one owner - full BMW main dealer service history.

I’ve had it a couple of weeks now. I live in London so haven’t had many occasions to take it past 4000rpm. When I have deployed WOT I’ve noticed similar issues posted on here.

There is a 1 second cut off in the throttle at around 5000rpm when changing from up from 2nd to 3rd and again from 3rd to 4th.

I’ve had the spark plugs changed and the garage I bought it from are changing the coil packs next week.

He’s plugged it in and there are no error codes whatsoever. Car seems immaculate.

I’ve also felt like when I first get to 4th gear - there can also be that 1 second cut in throttle power.

This only happens when I floor it. It drives superbly otherwise and I’m very happy with it.

I bought from RCC in London. The guy Pres seemed to really know his BMW’s and is totally perplexed by this issue. He has tried to suggest its an engine safety thing but it doesn’t happen every time and I just don’t buy that.

I’d love to know if anyone found a definitive answer to what causes this issue and more importantly how to fix it!

Cheers,
Oli

[Bimmer_Engineer]

Welcome to the forum...no etiquette breaches here...except you’ve posted in the e90 section and considering you have a late model UK spec model you’d probably get better responses on the F30 section of the forum.

[OG83]

Thanks pal! I’ve tried an F30 chat, seems to be more common with E90s but a couple of people there have had similar issues...

[Bmwskills79]

Originally Posted by lazd

Hi all,
My vehicle:
Recently purchased CPO 2008 335i steptronic with no modifications and 58k miles.

Problem description:
On two occasions within the past month, my engine has "cut out" for a split second when accelerating under wide open throttle. The car will be accelerating fine around 5000 RPM, then will suddenly lose all engine power (not electrical, iDrive and dash are unaffected), then resume accelerating at full force less than a second later, resulting in quite the jolt and a drop in RPMs.

Supplemental information:

• No lights are visible in dash during power loss (DTC is not flashing).
• This is in the near the top of a gear (but not during a shift).
• I cannot recall if I was in DS (sport mode) or not, but I was definitely not in steptronic (manual) mode.
• I have not read codes yet, but I do not have check engine or any warning lights.

Research:
I searched extensively and found the following posts which describe the same issue (though they're on different or modified cars):

• N54 acceleration problem: modified 335i, OP reports problem is still unresolved
• N54 acceleration problem: poster says stock 335i had same problem as OP, poster reports problem went away on its own
• 330i Loses power randomly: Poster suggest fuel filter, OP reports back with success
• 335d Acceleration Flat Spot: Posters suggest "gearbox reset" and suggest it may be due to traction control, OP does not report back

Has anyone else seen and/or resolved this problem?

The only suggestion reported as successful is replacing the fuel filter. Can anyone attest or refute this solution? Does anyone have other suggestions?

Please let me know if I can provide additional information. I appreciate your help and value your time!

Update: A number of people have reported similar problems and a variety of causes:

• ed.w's 330i: @ 40k: Bad fuel filter
• achien's 335i @ 30k: Excessive carbon buildup
• ruphianh 335i @ 115k: Bad throttle body
• pimple's 335i @ 50k: Bad ignition coils

Others have reported, but not fixed:

• lazd's 335i: @ 58k: (this post)
• e90fun's 335i @ 45k: Sudden loss of power and odd sound
• rismo123's 335i: Sudden loss of power 5700RPM+, 4th & 5th
• pits200's 335i @ 45k: Sudden loss of power 2nd & 3rd
• DefactoM6's 335i @ 28k: (same problem)

I had the same concern on a 2008 335XI. The tach would blip and then come right back. I noticed the voltage PID of the DME and JBE2 would drop to 12.0volts for a few seconds and then come back up to normal charging voltage. After replacing fuel pump, coils, alternator, spark plugs, DME relay I found crankshaft sensor was causing the concern. After replacing crankshaft sensor, vehicle operates normally.

I hope this helps someone.