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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 01-28-2008, 10:44 AM
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540ig5 540ig5 is offline
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Flashing check engine light????????

2 days ago after starting my car and driving for about 30 seconds my check engine light started blinking. I slowed down but kept driving. The light stopped blinking but then came back on after about a minute. The car did not drive different in any way. I pulled over, turned off the car and then started it again, and the light was gone. Iíve been driving the car for 2 days now and the blinking check engine light has not come back on. Any ideas on what that was all about. I didnít get the codes read, is that something I should do ASAP or it could wait?
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  #2  
Old 01-28-2008, 10:57 AM
Waveho Waveho is offline
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Yes get the code read at a place like autozone; the CEL will come on for a reason that is usually detrimental to the car....
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  #3  
Old 01-28-2008, 11:33 AM
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Brian McKinney Brian McKinney is offline
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Quote:
the CEL will come on for a reason that is usually detrimental to the car....
umm a fuel tank breather valve and or a slightly loose gas cap are not really that detrimental to the car....which it could very well be
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Old 01-28-2008, 11:36 AM
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lild lild is offline
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i'm think somethings lose. if the light is not on, a code reader may not be able to retrive the codes.
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Old 01-28-2008, 12:00 PM
Waveho Waveho is offline
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Originally Posted by Brian McKinney View Post
umm a fuel tank breather valve and or a slightly loose gas cap are not really that detrimental to the car....which it could very well be
I said "usually."
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  #6  
Old 01-28-2008, 12:01 PM
Waveho Waveho is offline
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Originally Posted by lild View Post
i'm think somethings lose. if the light is not on, a code reader may not be able to retrive the codes.
My Peake reader is able to revive codes even after the CEL light is extinguished.
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  #7  
Old 01-28-2008, 12:11 PM
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lild lild is offline
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that's what i get for having a cheap code reader.
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  #8  
Old 01-28-2008, 06:19 PM
Ryan M Ryan M is offline
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The CEL usually only comes on if it's an emissions related problem. Even with the CEL out, the codes should still be stored and able to be retrieved, if there were any.
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Old 01-28-2008, 06:46 PM
dbruce dbruce is offline
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Solid CEL means something that can wait (emissions related etc). Blinking CEL means stop the car immediately, it usually points to misfires.

If you got a blinking CEL, you have a problem.

http://forums.bimmerforums.com/forum...ferrerid=56200

Last edited by dbruce; 01-28-2008 at 06:51 PM.
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  #10  
Old 01-28-2008, 07:34 PM
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540ig5 540ig5 is offline
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Quote:
Originally Posted by dbruce View Post
Solid CEL means something that can wait (emissions related etc). Blinking CEL means stop the car immediately, it usually points to misfires.

If you got a blinking CEL, you have a problem.

http://forums.bimmerforums.com/forum...ferrerid=56200
Interesting, the only thing that's wired is that the car was driving absolutly fine.
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  #11  
Old 01-29-2008, 05:41 AM
KTrostel KTrostel is offline
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Quote:
Originally Posted by dbruce View Post
Solid CEL means something that can wait (emissions related etc). Blinking CEL means stop the car immediately, it usually points to misfires.

If you got a blinking CEL, you have a problem.

http://forums.bimmerforums.com/forum...ferrerid=56200
Yes and, a blinking CEL means the OBDII thinks that the problem it is monitoring will damage the engine. You do not need to stop immediately if you are in a dangerous position but you should gently drive the car to a place that you can park the vehicle.

Detonation can be very hard to detect and very quick to damage. If you CEL continues to flash get it checked immediately.
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Old 01-29-2008, 08:08 AM
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Al's540i Al's540i is offline
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You most likely had a misfire caused by an intake/vacuum leak, or a failing VANOS unit.
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  #13  
Old 01-29-2008, 08:47 AM
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Would a failing air pump cause this. It as been making a high pitch winding notice lately.
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  #14  
Old 01-29-2008, 09:45 AM
Ryan M Ryan M is offline
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Yes, the secondary air injection pump could very well cause this. It's part of the emissions system.
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