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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > 3100 low boost mode engaged -- CEL displayed



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      04-21-2012, 08:23 AM   #1
phil200tdi
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3100 low boost mode engaged -- CEL displayed

I have been trying to diagnose a fault with my N54.

The car started stumbling/shuddering at high RPM and WOT - No codes were generated.. I replaced all the spark plugs and cleaned the Vanos solenoids (swapping them over on refit) - this seemed to resolve the shuddering.

It seemed better for a week or so, but then I pulled a code for misfire on cylinder 3 started to get cut boost when repeatedly going WOT. I replaced the ignition coil on cylinder 3 and again things seemed much better.

Now the car runs like a champ pulling strongly with/without meth. BUT...
the car still occasionally goes into reduced boost - like 8/9psi. Could this be as a result of air in the meth line and the failsafe kicking in? a minute or so later its good to go!

A few back to back runs like this and switch to map two (I dont usually have so little mechanical sympathy, just trying to trigger a code!!) pulls hard through the rev range and then when lifting off I trigger a CEL!

Hopeful of finally pulling a code, I Connect laptop and the only thing recorded is:
3100 low boost mode engaged -- CEL displayed

What could be the problem? Other coils, Injectors, fuel pump? Its difficult to diagnose without codes...
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Last edited by phil200tdi; 04-21-2012 at 08:57 AM.
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      04-21-2012, 09:34 AM   #2
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Have you raised the max boost setting on the JB4 interface?

Change your gauges to show meth flow (7-5) and boost and you will be able to see your meth flow.
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      04-21-2012, 10:25 AM   #3
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Yep have done that.

It's difficult to tell whether its air in meth line or not.

I think its misfiring which triggers failsafe on map 3. Given it was on map 2 When the cel triggered I would say there is a hardware problem..
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      04-22-2012, 10:17 AM   #4
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Same issue on Map 0?

Send a log in of the problem

Last edited by neil@JuicedUpTuning; 04-22-2012 at 10:25 AM.
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      07-24-2013, 01:38 PM   #5
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im having the same issue right now did you resolve the issue
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      07-24-2013, 03:51 PM   #6
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What are your fault codes? If your misfiring it could be lots of things.

In the end Mine was a vacuum problem. Upgraded to G5 ISO and replaced the vacuum system.. Now sorted.
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      09-05-2013, 10:59 AM   #7
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Just out of curiosity, what exactly did you replace with respect to the vacuum system? Trying to troubleshoot here too.
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      09-05-2013, 12:36 PM   #8
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Ususal suspects are, hoses, boost solenoids and vac canisters.
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      11-03-2013, 08:14 PM   #9
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I am having the same problem. What exactly did you fix? I only get the code when I am WOT or hard shifting.
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      02-12-2014, 07:10 PM   #10
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Quote:
Originally Posted by TVPhoto View Post
I am having the same problem. What exactly did you fix? I only get the code when I am WOT or hard shifting.
I also get it sometimes when its WOT, and notice my temp is a little hot, nowhere near max but hotter than normal.. i had this issues before AND after Jb4.
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