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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Fuel injectors.



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      12-26-2011, 10:31 AM   #1
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Smile Fuel injectors.

Hey guys what do you think about STP fuel injector cleaner? does the stuff work and will it help gas mileage and will i regain lost horsepower like it says?
Thanks for you help.
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      12-26-2011, 10:54 AM   #2
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Right now, bar none, out there for dealing with carbon deposits in engines is the BG44K. It's a PolyEtherAmine based fuel cleaner.
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      12-26-2011, 11:54 AM   #3
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Quote:
Originally Posted by Thumperx View Post
Right now, bar none, out there for dealing with carbon deposits in engines is the BG44K. It's a PolyEtherAmine based fuel cleaner.
where do you buy this? never seen it at the common places (auto zone, o'reillys, walmart, etc.)... do you order yours online or are you fortunate enough that yours is local?
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      12-26-2011, 12:54 PM   #4
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It'll help, not much but it won't hurt. However no gas additive will deal with the real power-robbers on our cars which are the valves and their notorious carbon buildup. Our cars are direct injected so anything added to the fuel system won't touch the valves. If you want some tangible power back you need to sea foam your valves or strip down your intake and get in there with some B12 and the wire brushes.
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      12-26-2011, 03:53 PM   #5
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He has a 325. There are no carbon issues like the N54. The only cleaner to use is Techron or have the injectors cleaned with the professional injector cleaning tools out there.
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      12-28-2011, 07:44 AM   #6
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Originally Posted by David1 View Post
He has a 325. There are no carbon issues like the N54. The only cleaner to use is Techron or have the injectors cleaned with the professional injector cleaning tools out there.
i have N52, so would getting them cleaned at my dealership be my best option.
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      12-28-2011, 08:14 AM   #7
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Quote:
Originally Posted by sowrab View Post
i have N52, so would getting them cleaned at my dealership be my best option.
Ehh.. just run a bottle of Techron or BMW branded (probably Techron) through a be done with it. Like others have said it won't hurt but probably won't notice much of a difference. Especially if you already use top tier gasoline to begin with.
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      12-28-2011, 06:19 PM   #8
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N52 will not have carbon buildup

Just run techron to clean your injectors.
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      12-30-2011, 12:44 AM   #9
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Quote:
Originally Posted by lync9763 View Post
where do you buy this? never seen it at the common places (auto zone, o'reillys, walmart, etc.)... do you order yours online or are you fortunate enough that yours is local?
Sorry for the late reply. Yeah, I haven't seen it at any of those stores as of yet. Check out their website though:http://www.bgprod.com/products/fuelair.html

I bought mine on Ebay ( they are not cheap in cost per can). I found it more potent and effective than Techron or Seafoam products.

BMW recommends Chevron Techron fuels which help prevent or reduce the amount of carbon build up. But our engines are direct inject, so in time the build up will happen. All we can do is mitigate it.
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      12-30-2011, 10:46 AM   #10
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Quote:
Originally Posted by Socom View Post
Ehh.. just run a bottle of Techron or BMW branded (probably Techron) through a be done with it. Like others have said it won't hurt but probably won't notice much of a difference. Especially if you already use top tier gasoline to begin with.
Is this what your talking about? http://www.amazon.com/Chevron-Techro...0&sr=8-1-fkmr1
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      12-30-2011, 12:26 PM   #11
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Once again, only the 335 is direct injection (of the 3 series).

They have many more direct injection models in Europe but will not sell them in north America due to the sulphur in our fuel (carbon build up.)
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      12-30-2011, 01:04 PM   #12
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Quote:
Originally Posted by sowrab View Post
Yep..you.can pick it up at almost any autoparts store.
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      12-30-2011, 01:57 PM   #13
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Just FYI I had to replace the notorious broken head bolt recently and removed my intake manifold to do so.

My Intake valves were literally shiny, not a speck of carbon buildup. N52 330i with 74,xxx miles.

Fuel system cleaner like techron may be good for your injectors and possibly exhuast valves but my intake valves looked brand new.
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      12-30-2011, 04:26 PM   #14
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Quote:
Originally Posted by jimmydever View Post
Fuel system cleaner like techron may be good for your injectors and possibly exhuast valves but my intake valves looked brand new.
Exactly, all non-DI engines intake is showered in gasoline which washes all deposits away.
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      12-30-2011, 10:16 PM   #15
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Quote:
Originally Posted by Thumperx View Post
But our engines are direct inject, so in time the build up will happen. All we can do is mitigate it.
The only thing a 335 owner can do to avoid carbon buildup is move out of North America or Australia to get away from gas containing sulpher.

You can run also run injected meth into the intake, check out the 3 series turbo forum.
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      12-31-2011, 08:46 AM   #16
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Quote:
Originally Posted by Socom View Post
Yep..you.can pick it up at almost any autoparts store.
Thanx bro. no wonder your a general.
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