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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > What does a flashing SES light mean?



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      01-28-2008, 09:17 PM   #1
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What does a flashing SES light mean?

Today im driving with my cousin going to the gym and I had to cut off car so I hit the gas, the car got up to about 55mph and then the reduced power light came on and then also the SES light started to flash, I pulled over and it just went away, that never has happened to me. What does it mean?
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      01-28-2008, 09:20 PM   #2
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Flashing SES light almost always means misfire. Seems to be a common problem with your car. Try to drop boost down to 80% or, better yet, run on the valet mode for a day or two. See if the problem goes away. If it does, then we can conclude that it is power related. Have you ever used any fuel additives?

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      01-28-2008, 09:34 PM   #3
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Quote:
Originally Posted by shiv@vishnu View Post
Flashing SES light almost always means misfire. Seems to be a common problem with your car. Try to drop boost down to 80% or, better yet, run on the valet mode for a day or two. See if the problem goes away. If it does, then we can conclude that it is power related. Have you ever used any fuel additives?

Shiv
Shiv, i am at 80%; i used a 100oct fuel about a month ago since then i have probably filled up 10 times with 93oct. i even changed all my plugs and coils. so what should i do now?
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      01-28-2008, 09:37 PM   #4
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Originally Posted by Chitown335i View Post
Shiv, i am at 80%; i used a 100oct fuel about a month ago since then i have probably filled up 10 times with 93oct. i even changed all my plugs and coils. so what should i do now?
Never used any octane booster? IIRC, you routinely get misfire on cylinder 6, right? If so, it may be worth swapping cyl 5 and cyl 6 fuel injector. If the misfire follows the injector, the injector is the culprit. I have seen this before.

Regarding your plugs and coils, did you do the work yourself? Or did you leave it to the dealership. Did you get the old plugs and coils back?

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      01-28-2008, 09:43 PM   #5
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Again, things are not getting better, take it easy.
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      01-29-2008, 12:16 AM   #6
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Quote:
Originally Posted by shiv@vishnu View Post
Never used any octane booster? IIRC, you routinely get misfire on cylinder 6, right? If so, it may be worth swapping cyl 5 and cyl 6 fuel injector. If the misfire follows the injector, the injector is the culprit. I have seen this before.

Regarding your plugs and coils, did you do the work yourself? Or did you leave it to the dealership. Did you get the old plugs and coils back?

Shiv
Shiv, i took the car and had the dealership do the work, the gave me the old plugs and coils back. ill try swaping the injector, also can a bad connection the the procede cause the same issue?
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      01-29-2008, 12:25 AM   #7
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Quote:
Originally Posted by Chitown335i View Post
Shiv, i took the car and had the dealership do the work, the gave me the old plugs and coils back. ill try swaping the injector, also can a bad connection the the procede cause the same issue?
I don't see a bad connection being that intermittent that it only happens during acceleration.

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      01-29-2008, 01:05 AM   #8
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Okay well, then i will have them swap out the injectors tomorrow, does it matter if i tell them switch 5 and 6 or can i switch 1 and 6?
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      01-29-2008, 01:10 AM   #9
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Okay well, then i will have them swap out the injectors tomorrow, does it matter if i tell them switch 5 and 6 or can i switch 1 and 6?
Doesn't matter. Just make sure you swap out the injector in the misfire prone cylinder with an injector from a misfire-free cylinder. Oh yeah.. and just be careful. I've not done this job in a DI system such as the N54. I'm not sure if special tools are involved. In fact, I wouldn't be surprised if this isn't a shadetree mechanic job since we are dealing with a fuel system that operates at 3000+psi!

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      01-29-2008, 01:17 AM   #10
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Did you ever try re-gapping the plugs to a smaller gap?
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