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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Boost Solenoid



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      11-25-2017, 09:52 PM   #1
dleccord
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Boost Solenoid

My solenoids are buzzing pretty loud. How hard is it to replace? And should I stop driving the car completely until itís fixed? Does anyone have the part number?
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      11-25-2017, 11:21 PM   #2
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11747626351
https://www.realoem.com/bmw/enUS/sho...diagId=11_4472
Takes 5 min to swap.
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      11-25-2017, 11:40 PM   #3
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you're the real MVP.
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      11-26-2017, 10:47 PM   #4
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As long as you dont drop the nuts lol

Use a flex head or bent handle ratchet and magnetic socket or shove some butyl rope into the socket to hold it.
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      11-27-2017, 10:38 AM   #5
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what are the symptoms of these failing
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      11-27-2017, 11:57 AM   #6
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Low boost. My car wasnít boosting above stock levels with JB4 or MHD, but never threw a code because it was still hitting around 7.5psi. Replaced it and was back over 18psi with my Wedge tune.
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      11-27-2017, 01:46 PM   #7
dleccord
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I can confirm that I didnít get codes too but instead a buzzing sound by the turbo. Also, I noticed inmediately that my car wasnít pulling as strong, ranging between mid to wide throttle.
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      11-28-2017, 07:45 PM   #8
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do you guys not get codes for the boost solenoid? it just goes bad and throws no code? I get the code 2C57 reduced power mode, (no boost leaks) when I don't run Jb-4 at random times (map 0)... and my car becomes as slow as a Prius. Then it goes away once i stop and start the car. This comes on randomly but not all the time. I have never got the code while running Map 1 on JB-4 though. I don't hear any buzzing sound either....

I contacted BMS and they said check boost solenoid connection and it is connected fine to it.
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      11-28-2017, 08:56 PM   #9
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      11-29-2017, 01:58 AM   #10
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Originally Posted by Vampire335i View Post
do you guys not get codes for the boost solenoid? it just goes bad and throws no code? I get the code 2C57 reduced power mode, (no boost leaks) when I don't run Jb-4 at random times (map 0)... and my car becomes as slow as a Prius. Then it goes away once i stop and start the car. This comes on randomly but not all the time. I have never got the code while running Map 1 on JB-4 though. I don't hear any buzzing sound either....

I contacted BMS and they said check boost solenoid connection and it is connected fine to it.
You're more likely to get this question answered over on n54tech, but I'll comment as I had a similar issue back when I ran a JB4.

If you cut the diode and are on ISO firmware map 0 no longer works while driving around. Use map 4 for stock power levels.
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      11-29-2017, 03:12 AM   #11
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Quote:
Originally Posted by Toome View Post
You're more likely to get this question answered over on n54tech, but I'll comment as I had a similar issue back when I ran a JB4.

If you cut the diode and are on ISO firmware map 0 no longer works while driving around. Use map 4 for stock power levels.
I didnít cut anything. I installed all the sensors and then connected the wires in the DME box. I didnít open apart my JB-4
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      11-29-2017, 03:16 AM   #12
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Originally Posted by Vampire335i View Post
Quote:
Originally Posted by Toome View Post
You're more likely to get this question answered over on n54tech, but I'll comment as I had a similar issue back when I ran a JB4.

If you cut the diode and are on ISO firmware map 0 no longer works while driving around. Use map 4 for stock power levels.
I didnít cut anything. I installed all the sensors and then connected the wires in the DME box. I didnít open apart my JB-4
Depending on when you bought it the diode could have already come "cut" and with ISO firmware. If every other map runs fine or you remove the JB4 and the cars runs good then that's your issue. Just one of the quirks of the JB4 and reasons I switched to MHD.
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      11-29-2017, 03:34 AM   #13
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Quote:
Depending on when you bought it the diode could have already come "cut" and with ISO firmware. If every other map runs fine or you remove the JB4 and the cars runs good then that's your issue. Just one of the quirks of the JB4 and reasons I switched to MHD.
Yeah I just bought it new three weeks ago so I assume it is the updated version

Is it possible to test if your boost solenoid is bad?
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      11-29-2017, 03:40 AM   #14
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Quote:
Originally Posted by Vampire335i View Post
Quote:
Depending on when you bought it the diode could have already come "cut" and with ISO firmware. If every other map runs fine or you remove the JB4 and the cars runs good then that's your issue. Just one of the quirks of the JB4 and reasons I switched to MHD.
Yeah I just bought it new three weeks ago so I assume it is the updated version

Is it possible to test if your boost solenoid is bad?
Best to record a log and see if your boost is where it should be.
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      11-29-2017, 10:24 PM   #15
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if you're not hitting target, you could also have bag plug and/or coil.
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      12-02-2017, 03:42 PM   #16
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I wish there was a youtube video of this replacement. Also, last year i looked up a list of all the vacuum lines too but only the n54 lines showed up.

Im pretty sure I need to replace mine.
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      12-02-2017, 05:46 PM   #17
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It's easy, just go for it and try not to drop the nuts because it's a pain in the ass to fish for them, that'll be the only hard part lol.
When I do I hit the under-tray from underneath and listen for them rattling around to work out where they are, then I can grab them. This always happens to me when I DIY...
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