Random unexplained power loss?!?

4doorbmwpower · 06-13-2012, 09:23 PM

was doing some spirited driving and got a SES light and smelled a burning smell, some vibrations under acceleration and then the SES light went out and the vibrations stopped and there werent any codes.. but the power wasnt back almost like the boost is half of what it was.. Took the car in to BMW explained it to them they replaced the MAP sensor said it was reading bad. Yet the car is still running not 100% like a noticable power loss.. Any explinations or has anyone had a simmilar issue?

idrift4wd · 06-13-2012, 10:11 PM

you probably got a miss fire, what kinda power loss? limp mode would give you reduced power. or they fixed it and reflashed it with a new dme software, some say its slower.

4doorbmwpower · 06-13-2012, 10:25 PM

its not in limp mode.. and i have had missfires it wasnt a misfire plus that would leave a code... I have JB4 so im not worried about new DME software.

seetully · 06-13-2012, 10:40 PM

Quote:

Originally Posted by 4doorbmwpower

its not in limp mode.. and i have had missfires it wasnt a misfire plus that would leave a code... I have JB4 so im not worried about new DME software.

1: Your positive you dont have auto clearing on?

2: Has the problem since gone away?

4doorbmwpower · 06-13-2012, 10:45 PM

auto clearing is off.. and the SES light went out as soon as the vibrations stopped.. since that moment however there has been a deff power loss, not like limp mode power loss but the turbos arent spooling as loud and just seems sluggish.. sad really.

az335iat · 06-13-2012, 11:16 PM

Do a log and send to Terry.

pwrdbynel · 06-13-2012, 11:46 PM

How many miles ? Could be your spark plugs need to be changed or an injector on its way out. What cylinder was misfiring ? I would check there first.

rader1 · 06-13-2012, 11:46 PM

Sounds like it could be a possible boost leak. Do a log and send it to terry and/or post it up here.

4doorbmwpower · 06-14-2012, 09:12 AM

its NOT a misfire sorry for the misunderstanding, im leaning too what rader1 said and gonna try to find a boost leak, because thats the only think i know of that wont throw any codes and will cause a short of boost presure, Im putting a new CP and BOV on this weekend anyhow that will be a good time to check all my pluming guess ill just re tighten everything while im there.. And good idea on the log ill do one today n send it to terry asap

E90SoFlo · 06-14-2012, 09:13 AM

It could be a lot of things, and I have gotten misfires before without any code. The "clearing up" sounds like it could have cleared the codes and reset the ECU and cleared up.

4doorbmwpower · 06-19-2012, 01:06 PM

MAP SENSOR, apparently it was bad.. BMW diagnosed it replaced that and it runs like a champ.. it was tappering my boost WAYYYY down cause it was reading reallly high presures..

06-13-2012, 09:23 PM	#1
4doorbmwpower Captain 62 Rep 954 Posts Drives: Montego Blue E90 335i Join Date: Nov 2010 Location: North Carolina iTrader: (3)	Random unexplained power loss?!? was doing some spirited driving and got a SES light and smelled a burning smell, some vibrations under acceleration and then the SES light went out and the vibrations stopped and there werent any codes.. but the power wasnt back almost like the boost is half of what it was.. Took the car in to BMW explained it to them they replaced the MAP sensor said it was reading bad. Yet the car is still running not 100% like a noticable power loss.. Any explinations or has anyone had a simmilar issue?
	Appreciate 0 Tweet Quote

06-13-2012, 10:11 PM	#2
idrift4wd Brigadier General 149 Rep 3,552 Posts Drives: Three Hundred and Thirty Five Join Date: Jul 2010 Location: Yonkers NY iTrader: (0) Garage List 2007 BMW [7.00]	you probably got a miss fire, what kinda power loss? limp mode would give you reduced power. or they fixed it and reflashed it with a new dme software, some say its slower.
	Appreciate 0 Quote

06-13-2012, 10:25 PM	#3
4doorbmwpower Captain 62 Rep 954 Posts Drives: Montego Blue E90 335i Join Date: Nov 2010 Location: North Carolina iTrader: (3)	its not in limp mode.. and i have had missfires it wasnt a misfire plus that would leave a code... I have JB4 so im not worried about new DME software.
	Appreciate 0 Quote

06-13-2012, 10:45 PM	#5
4doorbmwpower Captain 62 Rep 954 Posts Drives: Montego Blue E90 335i Join Date: Nov 2010 Location: North Carolina iTrader: (3)	auto clearing is off.. and the SES light went out as soon as the vibrations stopped.. since that moment however there has been a deff power loss, not like limp mode power loss but the turbos arent spooling as loud and just seems sluggish.. sad really.
	Appreciate 0 Quote

06-13-2012, 11:16 PM	#6
az335iat Boost For Fun 0 Rep 32 Posts Drives: 2009 335i Coupe AT Join Date: Feb 2009 Location: Phoenix, AZ iTrader: (0)	Do a log and send to Terry. __________________ 09 335i Coupe JB4 G5, Meth, DCI 08 335i Sedan 12.035 at 118.14 1.92 60 foot JB4 Meth CM5, M10 Nitto NT05R on K1's, SOLD.
	Appreciate 0 Quote

06-13-2012, 11:46 PM	#7
pwrdbynel Private First Class 13 Rep 197 Posts Drives: 335i Coupe Join Date: Apr 2008 Location: SoCal iTrader: (1)	How many miles ? Could be your spark plugs need to be changed or an injector on its way out. What cylinder was misfiring ? I would check there first.
	Appreciate 0 Quote

06-13-2012, 11:46 PM	#8
rader1 Banned 70 Rep 2,197 Posts Drives: Cobb Stage 2+ 135i Join Date: Apr 2011 Location: Roanoke, VA iTrader: (0)	Sounds like it could be a possible boost leak. Do a log and send it to terry and/or post it up here.
	Appreciate 0 Quote

06-14-2012, 09:12 AM	#9
4doorbmwpower Captain 62 Rep 954 Posts Drives: Montego Blue E90 335i Join Date: Nov 2010 Location: North Carolina iTrader: (3)	its NOT a misfire sorry for the misunderstanding, im leaning too what rader1 said and gonna try to find a boost leak, because thats the only think i know of that wont throw any codes and will cause a short of boost presure, Im putting a new CP and BOV on this weekend anyhow that will be a good time to check all my pluming guess ill just re tighten everything while im there.. And good idea on the log ill do one today n send it to terry asap
	Appreciate 0 Quote

06-14-2012, 09:13 AM	#10
E90SoFlo Banned 196 Rep 2,669 Posts Drives: E90 335i Join Date: Jun 2011 Location: Naples, FL iTrader: (9)	It could be a lot of things, and I have gotten misfires before without any code. The "clearing up" sounds like it could have cleared the codes and reset the ECU and cleared up.
	Appreciate 0 Quote

06-19-2012, 01:06 PM	#11
4doorbmwpower Captain 62 Rep 954 Posts Drives: Montego Blue E90 335i Join Date: Nov 2010 Location: North Carolina iTrader: (3)	MAP SENSOR, apparently it was bad.. BMW diagnosed it replaced that and it runs like a champ.. it was tappering my boost WAYYYY down cause it was reading reallly high presures..
	Appreciate 0 Quote