Car sputtering @ high rpm with Cobb Accessport

slim_n54 · 07-28-2016, 06:14 PM

Little worried. Installed Cobb Accessport a few weeks ago running stage 1 aggressive. 2010 N54 335i. DCI and M Performance exhaust. Was driving the last few days and at about 3/4 throttle the car starts to sputter like it's holding back. Uninstalled the tune, no sputtering even at full throttle. Figured it was the plugs and that I need new ones, colder NGK plugs. Before I replace those, is that what the issue most likely is? Or is it more likely to be a HPFP or even the coil packs?

Any ideas?

Thanks guys.

E30_335i · 07-28-2016, 06:30 PM

What charge pipe are you using?

Sgop335 · 07-28-2016, 06:47 PM

Quote:

Originally Posted by slim_n54

Little worried. Installed Cobb Accessport a few weeks ago running stage 1 aggressive. 2010 N54 335i. DCI and M Performance exhaust. Was driving the last few days and at about 3/4 throttle the car starts to sputter like it's holding back. Uninstalled the tune, no sputtering even at full throttle. Figured it was the plugs and that I need new ones, colder NGK plugs. Before I replace those, is that what the issue most likely is? Or is it more likely to be a HPFP or even the coil packs?

Any ideas?

Thanks guys.

Its a cobb ots. To be expected. I had misfires w their stage 1 drive tune, go figure.

slim_n54 · 07-28-2016, 06:51 PM

Quote:

Originally Posted by E30_335i

What charge pipe are you using?

Just installed CPE charge pipe, blew the factory one off a few times and it finally cracked.

slim_n54 · 07-28-2016, 06:54 PM

Quote:

Originally Posted by Sgop335

Its a cobb ots. To be expected. I had misfires w their stage 1 drive tune, go figure.

So would you recommend just leaving the tune installed and know that will happen at times or get a custom tune?

ferocity02 · 07-28-2016, 06:55 PM

Sounds like a misfire. It's not uncommon for tunes to push the limits of the components and expose issues like these. Changing the plugs is a good first step. If it continues you may need to change coils too.

Log some data so we can make sure nothing else is wrong, like fueling.

Sgop335 · 07-28-2016, 07:00 PM

Quote:

Originally Posted by slim_n54

So would you recommend just leaving the tune installed and know that will happen at times or get a custom tune?

Sorry, i got rid of cobb.

BKBMW335I · 07-28-2016, 10:53 PM

How much E85 are you using??

BSM n54iS · 07-28-2016, 10:59 PM

Welllll you can take a few logs and see if it's your hpfp, post them up on the tech section if you're not sure. Orrrr push your car and check for codes...

vapore0n · 07-29-2016, 07:19 AM

vote for missfire. Time for new plugs
Had the same thing after installing Cobb stage 1.
It was awesome when it did not missfire though

Andrewah05 · 07-29-2016, 09:12 AM

Quote:

Originally Posted by Sgop335

Its a cobb ots. To be expected. I had misfires w their stage 1 drive tune, go figure.

Instead of blaming the tune based on your own issue with it, hows about you actually provide some help. OP, pull codes if you can and go from there, misfires could happen due to the Cobb pushing the engine, parts will wear out easier. Start with plugs as other members mentioned and go from there.

Sgop335 · 07-29-2016, 01:29 PM

Quote:

Originally Posted by Andrewah05

Instead of blaming the tune based on your own issue with it, hows about you actually provide some help. OP, pull codes if you can and go from there, misfires could happen due to the Cobb pushing the engine, parts will wear out easier. Start with plugs as other members mentioned and go from there.

Well in my case, just like op's, back to stock performance was fine. Better still moving on to MHD (initially ots and now my own tune) did not have any misfire issues. So...im not blaming the tune, it is a pos, there

O and the help Im providing? giving him real fb to stop wasting time on cobb ots.

Swizzie7 · 07-29-2016, 01:41 PM

Quote:

Originally Posted by Andrewah05

Instead of blaming the tune based on your own issue with it, hows about you actually provide some help. OP, pull codes if you can and go from there, misfires could happen due to the Cobb pushing the engine, parts will wear out easier. Start with plugs as other members mentioned and go from there.

^

Andrewah05 · 07-29-2016, 02:12 PM

Quote:

Originally Posted by Swizzie7

^

You going watch Tallahwahs CPL when they play in Florida?

ArcticRik · 07-29-2016, 04:29 PM

I would start checking the coils

Cory S · 07-29-2016, 11:17 PM

New plugs gapped at .018-.020", and a fresh set of coil packs. Together, they can be had for around $240.00 shipped....

e92_enthusiast_1 · 07-30-2016, 09:27 AM

Plugs and/or coils.

csu87 · 07-30-2016, 12:22 PM

Post logs and see what exactly its doing

924er · 07-30-2016, 01:31 PM

OP. How about u address the misfire as you should, plug, coil, Injectors, HPFP in that order and stop asking "what else it can be". Rule out the common things first and relieve all that waste of time on this forum.

Misfires are the most common failures when it comes to pushing your car to the limit. I was fine with stage 2 Cobb but wanted to show off in front of some chick so I ran e30 and it misfired like crazy. Ruled out sparkplugs, moved on the coils. Problem solved, back on the road

slim_n54 · 07-31-2016, 01:08 PM

Quote:

Originally Posted by 924er

OP. How about u address the misfire as you should, plug, coil, Injectors, HPFP in that order and stop asking "what else it can be". Rule out the common things first and relieve all that waste of time on this forum.

Misfires are the most common failures when it comes to pushing your car to the limit. I was fine with stage 2 Cobb but wanted to show off in front of some chick so I ran e30 and it misfired like crazy. Ruled out sparkplugs, moved on the coils. Problem solved, back on the road

I appreciate all the feedback guys. Sorry, I am not a super under-the-hood knowledgeable guy yet so I figured I'd ask. Still learning. Thanks

07-28-2016, 06:14 PM	#1
slim_n54 New Member 0 Rep 9 Posts Drives: 2010 335i MSport Join Date: Jul 2016 Location: Maryland iTrader: (0)	Car sputtering @ high rpm with Cobb Accessport Little worried. Installed Cobb Accessport a few weeks ago running stage 1 aggressive. 2010 N54 335i. DCI and M Performance exhaust. Was driving the last few days and at about 3/4 throttle the car starts to sputter like it's holding back. Uninstalled the tune, no sputtering even at full throttle. Figured it was the plugs and that I need new ones, colder NGK plugs. Before I replace those, is that what the issue most likely is? Or is it more likely to be a HPFP or even the coil packs? Any ideas? Thanks guys.
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07-28-2016, 06:30 PM	#2
E30_335i Second Lieutenant 169 Rep 212 Posts Drives: 2011 335i Join Date: Jun 2014 Location: Huntsville, AL iTrader: (0)	What charge pipe are you using? __________________ 2011 335i Sport, M3 control arms front/rear, ECS Tuning rear trailing arms, Bilstein HD's, StopTech BBK, Drexel LSD, Dinan camber plates, FBO's with Cobb Stage 2 tune, Corsa exhaust, 18x9 D-Force, 255/35 R-S4's
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07-28-2016, 06:55 PM	#6
ferocity02 Colonel 530 Rep 2,083 Posts Drives: 2013 135is Join Date: May 2014 Location: USA iTrader: (8)	Sounds like a misfire. It's not uncommon for tunes to push the limits of the components and expose issues like these. Changing the plugs is a good first step. If it continues you may need to change coils too. Log some data so we can make sure nothing else is wrong, like fueling. __________________ 2013 135is DCT Carbon Black Metallic
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07-28-2016, 10:53 PM	#8
BKBMW335I Captain 157 Rep 772 Posts Drives: '11 E93 335I Join Date: Aug 2015 Location: Land of OZ, Kansas iTrader: (0)	How much E85 are you using?? __________________ Mods: MHD Stg 2, xHP Flashtool Stage 3, VRSF 3" Chargepipe, Megan 4" Downpipes, Pure N55 Inlet, Outlet, VSRF 5" Stepped Intercooler, GFB Diverter, BMS N55 Intake, Michelin Pilot Super Sport Tires, BMS Sport Oil Cooler Valve, CF Spoiler, CF Kidney Grille, CF Mirror Covers, CF Eyelids, CF Wheel Hub Covers, CF Diffuser, M Sport Racing Strip, 20% Tints, and Golf Tee Mod
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07-28-2016, 10:59 PM	#9
BSM n54iS Brigadier General 2685 Rep 4,202 Posts Drives: '11 335is \| '16 Macan Turbo Join Date: Aug 2015 Location: Everywhere and Nowhere iTrader: (7)	Welllll you can take a few logs and see if it's your hpfp, post them up on the tech section if you're not sure. Orrrr push your car and check for codes... __________________ '11 335is BSM MT "BMW Performance Editon" \| '16 Porsche Macan Turbo GruppeM CF Intake \| AR Resonated DP \| ER CP \| Turbosmart RacePort BOV \| Cobb FMIC \| RB Inlets \| RB External Mishi/Turner OCC \| Michelin PS4 \| BMW Performance Springs/Bilstein B8 + Dinan & M3 bits \| BMW Brembo BBK \| BMW Performance CF Spoiler \| BMW Performance CF Lip \| BMW Performance Alcantara \| PS Designs GTS Armrest \| AG H6-40 \| Rear Seat Delete
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07-29-2016, 07:19 AM	#10
vapore0n Captain 40 Rep 669 Posts Drives: 2010 335i Join Date: Jul 2011 Location: MA iTrader: (0)	vote for missfire. Time for new plugs Had the same thing after installing Cobb stage 1. It was awesome when it did not missfire though
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07-29-2016, 04:29 PM	#15
ArcticRik Enthusiast 167 Rep 1,622 Posts Drives: Arctic Metallic E90 335i Join Date: Jan 2011 Location: Orlando iTrader: (11)	I would start checking the coils
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07-29-2016, 11:17 PM	#16
Cory S Major 305 Rep 1,163 Posts Drives: 2011 335i-X Join Date: Oct 2015 Location: N.H. iTrader: (0)	New plugs gapped at .018-.020", and a fresh set of coil packs. Together, they can be had for around $240.00 shipped.... __________________ 2011 335i X-drive 6AT / Pure turbo / 500AWHP/526TQ
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07-30-2016, 09:27 AM	#17
e92_enthusiast_1 Lieutenant Colonel 35 Rep 1,652 Posts Drives: '10 AW/CR e92 6mt 335i Join Date: Mar 2012 Location: Chandler, AZ iTrader: (1) Garage List 2010 BMW 335i [0.00]	Plugs and/or coils. __________________ COBB AP Stg 2+ FMIC Aggressive \| VRSF 3" Catless DP \| COBB FMIC \| BMS DCI \| CP-e Metal Charge Pipe \| 370+ whp/435+ lb.ft torque
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07-30-2016, 12:22 PM	#18
csu87 Banned 2134 Rep 3,554 Posts Drives: 09 335xi Join Date: Nov 2013 Location: Northern Colorado iTrader: (0)	Post logs and see what exactly its doing
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07-30-2016, 01:31 PM	#19
924er Colonel 352 Rep 2,050 Posts Drives: e92 335i '10 Join Date: Feb 2014 Location: Socal iTrader: (0)	OP. How about u address the misfire as you should, plug, coil, Injectors, HPFP in that order and stop asking "what else it can be". Rule out the common things first and relieve all that waste of time on this forum. Misfires are the most common failures when it comes to pushing your car to the limit. I was fine with stage 2 Cobb but wanted to show off in front of some chick so I ran e30 and it misfired like crazy. Ruled out sparkplugs, moved on the coils. Problem solved, back on the road __________________ '10 e92 N54 DCI intakes, ER chargepipe, TIAL BOV, VRSF 5in FMIC, BMS Downpipes COBB e30
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