First check engine light

madbim · 08-23-2012, 07:15 PM

Recently purchased an 08 335XI, cars been great. I made a WOT pull on to the freeway the other day, car pulled great I let off and got a check engine light "reduced power" yada yada. I pulled off shut the car down started it back up no light ran fine. I have the cheapo bluetooth ELM327 OBD2 reader, I connected it up and it has no stored codes or historic faults? So my question is what gives? Clearly this would have been a stored fault, is my cheapo OBD2 reader not going to work with this car?

Joe- · 08-23-2012, 08:18 PM

With the Car running pull the code, My guess is Low boost, either hole in induction system or turbos failing. or could be the boost pressure converter.

madbim · 08-23-2012, 08:35 PM

No luck, perhaps I need to look for a cheap hand held scanner. I can read other parameters like rpm, boost, mph ect... but nothing for codes.

WickedB · 08-23-2012, 11:02 PM

You put the car in "Limp mode", doesn't necessarily mean there will be a code believe it or not. Most likely your VANOS solenoids need to be cleaned. VERY common, do a search and you'll find at least 10 threads.

Also, what are you using the "Torque" app? From what I've found it doesn't read "pending" codes on our bimmers.

WickedB · 08-23-2012, 11:07 PM

Quote:

Originally Posted by Joe-

With the Car running pull the code, My guess is Low boost, either hole in induction system or turbos failing. or could be the boost pressure converter.

Joe:

What the h is a boost pressure converter?

And if it was a hole in the system or failing turbos it would've happened again right away... Not sure where you got all that from...

Joe- · 08-23-2012, 11:36 PM

Quote:

Originally Posted by WickedB

Joe:

What the h is a boost pressure converter?

And if it was a hole in the system or failing turbos it would've happened again right away... Not sure where you got all that from...

He is saying it happens on WOT, it could be a pin hole in the system which would mean more pressure = more likely to go into limp mode. Really without the codes it's hard to pin point what it's related to.

Also Boost Pressure Converter, you have two of them on an N54 engine. So I am not sure what is so funny. They also affect the induction system and can cause Low Boost codes. Most of the time a Code is thrown on WOT is Low boost.

My code was always thrown on WOT and Randomly during city driving. And was getting worse over time (left it for a year).
Simple restart of the engine would get rid of the code. Can also be boost lines which would go back to hole in the system.

Reference:

PRESSURE CONVERTER 2 11747595374 $132.60

http://realoem.com/bmw/showparts.do?...=11&fg=45&hl=6

Go WOT and see if the car goes into Limp again.

08-23-2012, 07:15 PM	#1
madbim Private First Class 34 Rep 160 Posts Drives: 08' E90 335xi Join Date: May 2011 Location: Madison, WI iTrader: (0)	First check engine light Recently purchased an 08 335XI, cars been great. I made a WOT pull on to the freeway the other day, car pulled great I let off and got a check engine light "reduced power" yada yada. I pulled off shut the car down started it back up no light ran fine. I have the cheapo bluetooth ELM327 OBD2 reader, I connected it up and it has no stored codes or historic faults? So my question is what gives? Clearly this would have been a stored fault, is my cheapo OBD2 reader not going to work with this car?
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08-23-2012, 08:18 PM	#2
Joe- Lieutenant 19 Rep 522 Posts Drives: 07 E92 335i Join Date: Jun 2011 Location: Greenwich CT iTrader: (2)	With the Car running pull the code, My guess is Low boost, either hole in induction system or turbos failing. or could be the boost pressure converter.
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08-23-2012, 08:35 PM	#3
madbim Private First Class 34 Rep 160 Posts Drives: 08' E90 335xi Join Date: May 2011 Location: Madison, WI iTrader: (0)	No luck, perhaps I need to look for a cheap hand held scanner. I can read other parameters like rpm, boost, mph ect... but nothing for codes.
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08-23-2012, 11:02 PM	#4
WickedB Second Lieutenant 19 Rep 290 Posts Drives: 2007 335i Convertible Join Date: Mar 2012 Location: Detroit, MI iTrader: (0)	You put the car in "Limp mode", doesn't necessarily mean there will be a code believe it or not. Most likely your VANOS solenoids need to be cleaned. VERY common, do a search and you'll find at least 10 threads. Also, what are you using the "Torque" app? From what I've found it doesn't read "pending" codes on our bimmers. Last edited by WickedB; 08-23-2012 at 11:23 PM..
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