[kingbmw5050]

Hey everyone so I have a 2009 e90 335 N54 engine
Bought the car a month ago. Knocked out all the maintenance car drives great no leaks no issues.

This week went fbo dual cone intakes catless downpipes the works charge pipe.

Just flashed MHD stage 2 last night on full wot keep getting the dreaded limp mode sign. When I scan car shoes boost pressure to high , restart the car back to normal if I keep rpm under 5-6K no issues otherwise same story.


Could it be boost solenoids if so why wasn’t it doing before the flash
Boost pressure sensor ?

Or maybe Version 9 map should I switch to Version 7

[AlpineweissF10]

Logs might help otherwise it's just shooting in the dark. Could be anything.

[Bimmer_Bro]

Originally Posted by kingbmw5050

Hey everyone so I have a 2009 e90 335 N54 engine
Bought the car a month ago. Knocked out all the maintenance car drives great no leaks no issues.

This week went fbo dual cone intakes catless downpipes the works charge pipe.

Just flashed MHD stage 2 last night on full wot keep getting the dreaded limp mode sign. When I scan car shoes boost pressure to high , restart the car back to normal if I keep rpm under 5-6K no issues otherwise same story.


Could it be boost solenoids if so why wasn’t it doing before the flash
Boost pressure sensor ?

Or maybe Version 9 map should I switch to Version 7

Like mentioned it's a little hard to tell without running a log.
I see you are In Canada also. Was it really cold when this was happening?
Have you upgraded the intercooler? If you are fbo you should be on the 2+ maps.
You could definitely try V7. I like V7 2+ better than v9 2+ anyway.
Have boost solenoids and vacuum lines ever been replaced?

[fgpalmer71]

When you say you knocked out all maintenance I assume you meant plugs and coils were included in that. Assuming they were, just out of curiosity, what plugs did you use and what did you gap them at?

[kingbmw5050]

Yes it was almost minus 20 with the windchill that night I upgraded to to stage 2 now with version 10 see how that goes.


No I have not done boost solenoids yet, inspected all vacuum lines they were good.

maintenance wise done , spark plugs Bosch , ignition coils (no misfires)

Oil cooler gasket, oil filter housing gasket all belts and pulleys. Suspension refresh. Oil change cabin filters. Had a broken coolant line swapped out and new radiator. Also did rear diff flush a and transfer case flush and front diff flush.
Power steering flush.


At this point I don not have the fmic intercooler yet that’s why I went stage 2 only wondering if. I should change boost solenoids

[Bimmer_Bro]

Originally Posted by kingbmw5050

Yes it was almost minus 20 with the windchill that night I upgraded to to stage 2 now with version 10 see how that goes.


No I have not done boost solenoids yet, inspected all vacuum lines they were good.

maintenance wise done , spark plugs Bosch , ignition coils (no misfires)

Oil cooler gasket, oil filter housing gasket all belts and pulleys. Suspension refresh. Oil change cabin filters. Had a broken coolant line swapped out and new radiator. Also did rear diff flush a and transfer case flush and front diff flush.
Power steering flush.


At this point I don not have the fmic intercooler yet that’s why I went stage 2 only wondering if. I should change boost solenoids

I am from Calgary so I am also familiar with the cold. I DD my 335xi.

Honestly it could just be the cold. At -20c the air is so dense, it's pretty easy to get a quick boost spike and over-boost for a second or 2. I use to have this issue on my tuned STI.

That being said, solenoids are pretty cheap on fcp euro. I am due to do mine as well. They are a very common maintenance item.

Just a FYI, I would 100% do intercooler before the weather gets warm. The stock ones are so terrible, they heat-soak even on stock tune. Add some years of bugs and dents from rock chips and they are even worse.
I have a cheap BMS one and it's done me great.

[kingbmw5050]

Yes I am definitely getting an intercooler in the next week as I want to go stage 2 plus wonder what kind of power I can expect.

My only other issue is the cel light is on for cat heating wonder if it’s a fuse or cable sensor issue.


Just sold my 2018 340i and came back to the N54 e90 drives so much better for me at least

[Bimmer_Bro]

Originally Posted by kingbmw5050

Yes I am definitely getting an intercooler in the next week as I want to go stage 2 plus wonder what kind of power I can expect.

My only other issue is the cel light is on for cat heating wonder if it’s a fuse or cable sensor issue.


Just sold my 2018 340i and came back to the N54 e90 drives so much better for me at least

Do you have the option selected in MHD for catless downpipes? If so and still getting a cel then yes it could be a bad 02 sensor or bad wire to the 02. They can get damaged during downpipe install if not careful.

You will see a good increase. I believe the 1+ map is more aggressive than just the "2" due to the stock intercooler limitations.

Do you have 94 fuel around you? I use the 2+ 93 oct maps with 94 fuel. I feel a big difference between the 91 and 94 oct maps.

[ky0u]

Originally Posted by kingbmw5050

Yes it was almost minus 20 with the windchill that night I upgraded to to stage 2 now with version 10 see how that goes.


No I have not done boost solenoids yet, inspected all vacuum lines they were good.


At this point I don not have the fmic intercooler yet that’s why I went stage 2 only wondering if. I should change boost solenoids

If your car is still on it's original boost solenoids, you should change them. Failing ones can cause the overboost issue. Also, have you double checked your vac hoses for pinches or kinks?

[kingbmw5050]

Yes I m gonna check everything again today and replace the boost solenoids tmrw. Right now I’m running version 10 stage 2 93 octane using petro Canada 94 octane it seems faster than the 91 tune

[Bimmer_Bro]

Originally Posted by kingbmw5050

Yes I m gonna check everything again today and replace the boost solenoids tmrw. Right now I’m running version 10 stage 2 93 octane using petro Canada 94 octane it seems faster than the 91 tune

Nice! I love the 93 maps too other than the price of fuel for them lol. I also have to go a little out of the way to get 94 but the car runs great on it.
I just tried v10 2+ today and it feels great so far.

Curious why you like your e90 more then the 340 you owned?

[kingbmw5050]

For me the f30 was too disconnected feeling the steering
Feel in the e90 is just amazing the chassis is great. I am into the old school bmw from the ones I’ve had in the past e46,e39 e60


Although I do miss all the looks I think the m sport was good looking with the fully adaptive led lights and the heads up display was nice.


But the N54 engine makes up for all that

[Bimmer_Bro]

Originally Posted by kingbmw5050

For me the f30 was too disconnected feeling the steering
Feel in the e90 is just amazing the chassis is great. I am into the old school bmw from the ones I’ve had in the past e46,e39 e60


Although I do miss all the looks I think the m sport was good looking with the fully adaptive led lights and the heads up display was nice.


But the N54 engine makes up for all that

That's awesome, neat to hear the comparison. I like the feel of older cars also. I always debate on upgrading but I love my e90 and it's so fast now. The N54 is a little maintenance heavy but such a great engine.
Are you manual or auto?

[kingbmw5050]

My car is an auto I have xhp from my old car gonna install that this week should be fun

[Bimmer_Bro]

Originally Posted by kingbmw5050

My car is an auto I have xhp from my old car gonna install that this week should be fun

I was going to suggest that. Xhp stage 3 is an absolute must. Will transform your car. Although you will probably need a new licence as they can't transfer from one car to another.
Also the Nelson racing v2 paddles are amazing. I love mine.

[kingbmw5050]

I contacted xhp before selling the car I flashed the dme back to stock
Added my new car and they will transfer it to the new one

[Jaronbwall]

Did you buy colder plugs and gap them correctly? I'm running 0.022 gap and most people stay near that measurement. Intake walnut blasted recently?
This are two important things to address before going stage 2+.

[Bimmer_Bro]

Originally Posted by Jaronbwall

Did you buy colder plugs and gap them correctly? I'm running 0.022 gap and most people stay near that measurement. Intake walnut blasted recently?
This are two important things to address before going stage 2+.

Colder plugs are not needed for MHD ots maps. I personally would only go colder on a custom tune or ethanol tune.
I use the oem 3 prong bosche plugs and coil packs. No need to gap and they have never skipped a beat. Been using this set up for years.

Walnut blast is always a great idea !

[Saif2018]

Originally Posted by Bimmer_Bro

Colder plugs are not needed for MHD ots maps. I personally would only go colder on a custom tune or ethanol tune.
I use the oem 3 prong bosche plugs and coil packs. No need to gap and they have never skipped a beat. Been using this set up for years.

Walnut blast is always a great idea !

Even on a custom tune, not needed on stock turbos. On hybrids they make sense.

I'm on OEM Bosch 3 prong plugs on a custom tune, never had a misfire.

[Bimmer_Bro]

Originally Posted by Saif2018

Even on a custom tune, not needed on stock turbos. On hybrids they make sense.

I'm on OEM Bosch 3 prong plugs on a custom tune, never had a misfire.

Make sense! I guess I should of clarified Colder on custom tune only if requested by the tuner. I am with you, I love the oem plugs.

[Cloverdale]

Originally Posted by Bimmer_Bro

Colder plugs are not needed for MHD ots maps. I personally would only go colder on a custom tune or ethanol tune.
I use the oem 3 prong bosche plugs and coil packs. No need to gap and they have never skipped a beat. Been using this set up for years.

Walnut blast is always a great idea !

Upon similar mods re-gapping the Bosche oem 3 prong to .022 rectified my rough running situation. Don't recommend using modern gap tools on any plug application (especially iridium) as it can result in the electrode being pushed down into the body of the plug. Boost solenoids are not difficult to test electrically and using a vacuum guage. And you'll want to add some E85 to the mix (30%) for some holy shit performance!

[Bimmer_Bro]

Originally Posted by Cloverdale

Upon similar mods re-gapping the Bosche oem 3 prong to .022 rectified my rough running situation. Don't recommend using modern gap tools on any plug application (especially iridium) as it can result in the electrode being pushed down into the body of the plug.

Interesting! I don't think I was even aware those 3 prong gaps could even be adjusted. Great info thx.