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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 > N54 lumpy idle long cranks



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      04-27-2014, 02:54 PM   #1
Lukey335i
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N54 lumpy idle long cranks

Hello to you all.

I recently bought a 2008 335i It had 52k on the clock, full service ect...
Anyway not long after I bought it the car went into limp mode, had it diagnosed and changed the vanos solenoids, which solved that issue.

Now I am on 57k and for a few thousand miles I've had a lumpy idle, long cranks worse when cold, however when warm still idle shake. Doesn't throw any codes, I changed oil and plugs, to no avail, however when removing the old plugs, only done 10k, cylinder 1 and 5 were highly contaminated with what I think is fuel.

Would I be right in saying I have two bad injectors? Leaking into cylinders causing a long crank?

As I am in the uk bmw want to charge me 200 gbp each injector, so does anyone import them to uk I could get some cheaper. Any advice is really appreciated thanks.
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      04-27-2014, 02:57 PM   #2
tc535i
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Long crank sounds like a hpfp
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      04-27-2014, 06:23 PM   #3
335NJ
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My idle also has a slight "sputter/lump", if you will. I'd be curious if other have this issue as well.

My guess is carbon build-up being the culprit.
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Last edited by 335NJ; 04-27-2014 at 06:29 PM..
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      04-27-2014, 08:32 PM   #4
BlackBB6
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It's likely your injectors, I have the same issue with a brand new HPFP, LPF sensor, plugs and coils too. My #2 cyl plug was black, and smelled like gas so I'm assuming it's leaking.
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      04-28-2014, 02:17 PM   #5
Lukey335i
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Does anywhere sell and supply to uk? I'm gonna try changing the bank, sure this is my problem I know a lot have hpfp and carbon build up but my plugs are covered in fuel so sure mine are just bad injectors. Any more help welcome
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