3100 low boost mode engaged -- CEL displayed

phil200tdi · 04-21-2012, 08:23 AM

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...

idnan · 04-21-2012, 09:34 AM

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.

phil200tdi · 04-21-2012, 10:25 AM

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..

neil@JuicedUpTuning · 04-22-2012, 10:17 AM

Same issue on Map 0?

Send a log in of the problem

WNF_335i · 07-24-2013, 01:38 PM

im having the same issue right now did you resolve the issue

phil200tdi · 07-24-2013, 03:51 PM

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.

icabod7 · 09-05-2013, 10:59 AM

Just out of curiosity, what exactly did you replace with respect to the vacuum system? Trying to troubleshoot here too.

Sparky68 · 09-05-2013, 12:36 PM

Ususal suspects are, hoses, boost solenoids and vac canisters.

TVPhoto · 11-03-2013, 07:14 PM

I am having the same problem. What exactly did you fix? I only get the code when I am WOT or hard shifting.

335iNavyGuy · 02-12-2014, 06:10 PM

Quote:

Originally Posted by TVPhoto

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.

04-21-2012, 08:23 AM	#1
phil200tdi Colonel 112 Rep 2,621 Posts Drives: 335i M Sport E90 LCI manual Join Date: Jan 2011 Location: Aylesbury iTrader: (1)	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... __________________ Car: e91 330d with Viezu map Gone but not forgotten: 2010 Jaguar XFR (Cat-back exhaust, pulley, intake mods and map), Highly Modified E90 335i LCI M Sport Manual (circa 480BHP/500lb ft) Last edited by phil200tdi; 04-21-2012 at 08:57 AM..
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04-21-2012, 09:34 AM	#2
idnan Lieutenant Colonel 76 Rep 1,518 Posts Drives: Alpine White 335i Join Date: Nov 2010 Location: Birmingham iTrader: (9)	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
phil200tdi Colonel 112 Rep 2,621 Posts Drives: 335i M Sport E90 LCI manual Join Date: Jan 2011 Location: Aylesbury iTrader: (1)	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.. __________________ Car: e91 330d with Viezu map Gone but not forgotten: 2010 Jaguar XFR (Cat-back exhaust, pulley, intake mods and map), Highly Modified E90 335i LCI M Sport Manual (circa 480BHP/500lb ft)
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04-22-2012, 10:17 AM	#4
neil@JuicedUpTuning 14 Rep 454 Posts Drives: BMW 135i Join Date: Aug 2010 Location: UK iTrader: (1)	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
WNF_335i Private First Class 6 Rep 120 Posts Drives: E90 335i 6MT Join Date: Mar 2012 Location: Brampton/Toronto iTrader: (1)	im having the same issue right now did you resolve the issue
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07-24-2013, 03:51 PM	#6
phil200tdi Colonel 112 Rep 2,621 Posts Drives: 335i M Sport E90 LCI manual Join Date: Jan 2011 Location: Aylesbury iTrader: (1)	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. __________________ Car: e91 330d with Viezu map Gone but not forgotten: 2010 Jaguar XFR (Cat-back exhaust, pulley, intake mods and map), Highly Modified E90 335i LCI M Sport Manual (circa 480BHP/500lb ft)
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09-05-2013, 10:59 AM	#7
icabod7 Second Lieutenant 18 Rep 254 Posts Drives: 2008 135i Coupe Join Date: Jun 2011 Location: Dallas iTrader: (0)	Just out of curiosity, what exactly did you replace with respect to the vacuum system? Trying to troubleshoot here too. __________________ cdv delete \| clutch stop \| bmw performance ssk \| meisterschaft gt \| berk mids \| dinan cai \| helix fmic \| m3 subframe bushings, swaybar, front and back suspension bits \| dinan stage 1 suspension \| dinan cf strut brace \|gc camber plates \| dinan oil cooler \| apex ec-7s w/PSSs \| cobb stage 1 + fmic
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09-05-2013, 12:36 PM	#8
Sparky68 Brigadier General 684 Rep 4,261 Posts Drives: 2016 M2 Alpine White Join Date: Oct 2012 Location: Cambs UK iTrader: (11) Garage List 2016 BMW M2 [0.50] 2017 BMW F30 330D [0.00] 2014 M135 [0.00] 2007 BMW 335i [0.00]	Ususal suspects are, hoses, boost solenoids and vac canisters. __________________ OG M2 7sp DCT Masata FMIC - Masata Boost Pipe - Cobra Catless DP - Powervalve Exhaust - Devilsown Methanol Injection BM3 Stage 2
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11-03-2013, 07:14 PM	#9
TVPhoto Living Life on the Fast Lane 2 Rep 71 Posts Drives: 2007 335I SGM E92 Join Date: Jan 2013 Location: New Iberia, Louisiana iTrader: (0)	I am having the same problem. What exactly did you fix? I only get the code when I am WOT or hard shifting. __________________ Modulare Forged M6 // ST Coilovers // JB4 G5 //Backend Flash // BMS DCI // AR Design DPs // M3 Front // Stett CP // Synapse BOV // BMS 2.2 Gal // Spec 2+ Clutch // CPE FMIC
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