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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > 335i w/ Cobb tune



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      07-13-2012, 10:21 AM   #1
bmw4lyfe
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335i w/ Cobb tune

I have an 07 335i ar dps intake hpf first gen exhaust an a cobb tune stage 2. Love the power but at idle it has an extremely small miss fire. All my injector coils are new and spark plugs are new. No codes or anything and it's not major. Also I feel like I have a dead spot in my pedal. I also have a sprint booster and leave it on aggressive. You can hear a tiny pop out of the exhaust every maybe minute or so it's not just a straight idle. But the pop is so unnoticeable so I'm not that worried. Anyone have an idea maybe or some suggestions of something that's causing it? The tune is updated to the latest version. The dead spot I don't think I'll be able to get rid of. Also I have an LSD in there and I take turns fast sometimes when I slip the clutch out I can barely feel a vibration. Feels like my rear idk if it could be the install of it or maybe something else. Any ideas would help. Anyone have similar issues? 80 thou miles on it. Other then that car feels great straight forward and sideways no complaints.
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      07-13-2012, 12:09 PM   #2
Jeff@TopGearSolutions
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If you have 80,000 miles and never had a intake valve cleaning that is likely your problem with idle. Although this car is notorious for a funky idle. The intake valves are usually gunked up by 30K. It is a characteristic of direct injection motors.
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      07-13-2012, 01:03 PM   #3
Jonjt
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Will dealers clean the intake valves for you?
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      07-13-2012, 01:07 PM   #4
benzy89
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2008 BMW 335i  [3.75]
Some have the walnut blasting equipment -- Look in the regional threads & see if there's a reputable shop near you that does it. They'll charge you a lot less for the same work
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