Really Need help diagnosing my N54

Davidgrnyk · 06-16-2019, 12:40 PM

So I have a 2008 Bmw 335i N54 with 40k miles
This is everything that happens to the car

Random "Engine Malfunction Power Reduced" However there is no loss of power and it still drives smoothly and normally. Usually shows message after a misfire, but sometimes just when i'm driving normally(like 20mph). This message goes away if I just turn off the car and turn it back on.

Random "Transmission Malfunctions" Same thing, shows the message but nothing is effected. Usually shows message after a misfire.This message goes away if I just turn off the car and turn it back on.

Also Random Misfires when flooring it, Misfire always happens when going over 70ish after the misfire there is either a "Transmission Malfunction or a Engine Malfunction". Its a 50/50 which malfunction pops up

My Scanner does not pick up any codes or and faults and no dashboard lights
Engine has under 40,000 miles

relative4 · 06-16-2019, 02:54 PM

You need a better scanner.

Bimmer_Engineer · 06-16-2019, 03:28 PM

Agreed...any time the warning light is tripped like that it will save a code in the computer. You need to get a bmw specific scanner and look again...

tisdrew · 06-17-2019, 08:19 AM

Agree with above. What's maintenance history been like (hpfp, injectors, fouled spark plugs, etc.) ?

Jklad · 06-17-2019, 01:12 PM

Quote:

Originally Posted by relative4

You need a better scanner.

+1 lol

Davidgrnyk · 06-17-2019, 01:36 PM

Quote:

Originally Posted by tisdrew

Agree with above. What's maintenance history been like (hpfp, injectors, fouled spark plugs, etc.) ?

When I got it it had a Turbo Failure. Oil got into the turbo and clogged it up, white smoke blew from the exhaust like crazy,other than that there has not been any problems

Davidgrnyk · 06-17-2019, 01:39 PM

Quote:

Originally Posted by relative4

You need a better scanner.

Probably, i have a $50 on from amazon.
One of my friends has a shop and works on BMW's so Ill just use his.

fredcase · 06-17-2019, 01:46 PM

Alternator or battery potentially. I just went through something similar.

Davidgrnyk · 06-17-2019, 02:06 PM

Quote:

Originally Posted by fredcase

Alternator or battery potentially. I just went through something similar.

How did you fix yours?
Can it really be the battery, because my battery has never been changed since 2008

catcher22 · 06-17-2019, 02:54 PM

Quote:

Originally Posted by Davidgrnyk

Quote:

Originally Posted by fredcase

Alternator or battery potentially. I just went through something similar.

How did you fix yours?
Can it really be the battery, because my battery has never been changed since 2008

a 2008 with only 40k miles? wow!

my vote is battery as well.

Bimmer_Engineer · 06-17-2019, 04:21 PM

Quote:

Originally Posted by catcher22

a 2008 with only 40k miles? wow!

my vote is battery as well.

it's probably been on jackstands for half of that time...

06-16-2019, 12:40 PM	#1
Davidgrnyk Registered 0 Rep 4 Posts Drives: 2008 335i E92 Join Date: Jun 2019 Location: California iTrader: (0)	Really Need help diagnosing my N54 So I have a 2008 Bmw 335i N54 with 40k miles This is everything that happens to the car Random "Engine Malfunction Power Reduced" However there is no loss of power and it still drives smoothly and normally. Usually shows message after a misfire, but sometimes just when i'm driving normally(like 20mph). This message goes away if I just turn off the car and turn it back on. Random "Transmission Malfunctions" Same thing, shows the message but nothing is effected. Usually shows message after a misfire.This message goes away if I just turn off the car and turn it back on. Also Random Misfires when flooring it, Misfire always happens when going over 70ish after the misfire there is either a "Transmission Malfunction or a Engine Malfunction". Its a 50/50 which malfunction pops up My Scanner does not pick up any codes or and faults and no dashboard lights Engine has under 40,000 miles
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06-16-2019, 02:54 PM	#2
relative4 Major 620 Rep 1,280 Posts Drives: '08 335xi E90 MT stage 1+ Join Date: Feb 2019 Location: Denver, CO iTrader: (0)	You need a better scanner.
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06-16-2019, 03:28 PM	#3
Bimmer_Engineer Lieutenant Colonel 1049 Rep 1,667 Posts Drives: 2007 335i Join Date: May 2018 Location: Louisiana iTrader: (0) Garage List 2008 Porsche Boxster [0.00] 2016 Mercedes Benz ... [0.00] 2007 BMW 335i [9.50]	Agreed...any time the warning light is tripped like that it will save a code in the computer. You need to get a bmw specific scanner and look again...
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06-17-2019, 08:19 AM	#4
tisdrew First Lieutenant 98 Rep 300 Posts Drives: 2009 335i Join Date: Dec 2015 Location: Melbourne, FL iTrader: (0)	Agree with above. What's maintenance history been like (hpfp, injectors, fouled spark plugs, etc.) ? __________________ "Wheels and exhaust aren't a build"
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06-17-2019, 01:46 PM	#8
fredcase Captain 262 Rep 776 Posts Drives: Bmw=trash Join Date: Mar 2014 Location: Noyb iTrader: (1)	Alternator or battery potentially. I just went through something similar.
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