Car into Limp Mode and no other codes showing

JJH · 08-26-2013, 11:04 PM

I have had just the dreaded half engine light come on lately. A check of the codes with my Cobb AP showed the “P3100” (Limp Mode) code on its own ONLY. This seems strange to me as I understood it usually shows with another associated fault code to indicate where the problem might be. Have any of you experienced this situation of just the limp mode only coming up?

I am running Cobb Stage 2+FMIC Aggressive with aFe DCI, AR catless DPs, ER CP/Forge DVs (green springs) and ER FMIC on 98 RON fuel.

The car runs strong and a check with the AP in live data mode shows she is boosting up fine. It pulls like a beast as you would expect when stomping on the accelerator. But the code tends to pop in normal traffic driving/cruising gently, usually after a slight lift-off - for example to slow down for traffic ahead or when approaching an intersection. The half-engine light comes on just about every time I drive it now.

I have searched the forum and some have pointed to a boost leak or faulty Vanos solenoids. I have installed a new pair of solenoids and that did not help. I replaced/checked all the vacuum hoses at the top end (including those around the oil filter housing) and have checked all clamps and connections to the CP and IC.

Any ideas where else I need to look at?

joec500 · 08-27-2013, 01:44 PM

I would try running around in stock mode for a bit to see if the limp mode returns. Maybe it's something in the software?

CHECKERED · 08-27-2013, 04:09 PM

how is your oil temp

JJH · 08-28-2013, 06:45 PM

Quote:

Originally Posted by joec500

I would try running around in stock mode for a bit to see if the limp mode returns. Maybe it's something in the software?

Thanks; makes sense and will try that.

Quote:

Originally Posted by CHECKERED

how is your oil temp

It's always in the normal range - 210-230 deg F (100-110 deg C) - it's still winter here(!). Why would you ask that? Is this a clue to something?

Gemballa1980 · 08-30-2013, 10:14 PM

Any updates?? Has it thrown limp mode since flashing back??

08-26-2013, 11:04 PM	#1
JJH Major 542 Rep 1,107 Posts Drives: IB E92 M3 DCT; SG E90 325i Join Date: Nov 2012 Location: Canberra, Australia iTrader: (1)	Car into Limp Mode and no other codes showing I have had just the dreaded half engine light come on lately. A check of the codes with my Cobb AP showed the “P3100” (Limp Mode) code on its own ONLY. This seems strange to me as I understood it usually shows with another associated fault code to indicate where the problem might be. Have any of you experienced this situation of just the limp mode only coming up? I am running Cobb Stage 2+FMIC Aggressive with aFe DCI, AR catless DPs, ER CP/Forge DVs (green springs) and ER FMIC on 98 RON fuel. The car runs strong and a check with the AP in live data mode shows she is boosting up fine. It pulls like a beast as you would expect when stomping on the accelerator. But the code tends to pop in normal traffic driving/cruising gently, usually after a slight lift-off - for example to slow down for traffic ahead or when approaching an intersection. The half-engine light comes on just about every time I drive it now. I have searched the forum and some have pointed to a boost leak or faulty Vanos solenoids. I have installed a new pair of solenoids and that did not help. I replaced/checked all the vacuum hoses at the top end (including those around the oil filter housing) and have checked all clamps and connections to the CP and IC. Any ideas where else I need to look at?
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08-27-2013, 01:44 PM	#2
joec500 Brigadier General 125 Rep 3,004 Posts Drives: it has 4 wheels Join Date: Jul 2008 Location: San Francisco iTrader: (10)	I would try running around in stock mode for a bit to see if the limp mode returns. Maybe it's something in the software? __________________ 2007 E92 6MT SGM: MusicarNW Level 2, Procede Rev 2.5, FFTEC/Vishnu LPFP with Flexfuel Sensor and Flash, M3 Offset V701's, WaveTrac LSD, Michelin PSS, Downpipes, M3 Control Arms, TCKline D/A Suspension, LCI Tail lights, Lux AE's, ER Charge Pipe, DCI's, Mtech Front and Rear, M3 Sideskirts, HPF Stage 1 Clutch
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08-27-2013, 04:09 PM	#3
CHECKERED ex deus machina 123 Rep 968 Posts Drives: G30, F15, Audi S4 Join Date: Oct 2012 Location: Southern NH iTrader: (12)	how is your oil temp __________________ Daily: G30 M550i, Bluestone, JB4, 1 step colder plugs, 6WB retrofit Winter Beast: Audi S4 4.2L V8, Supercharger, brakes, suspension & exhaust mods Wifes': F15 M50d clone, DUDMD tune, WMI, MPBK Gone: E92 335i N54 468rwtq
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08-30-2013, 10:14 PM	#5
Gemballa1980 Second Lieutenant 17 Rep 297 Posts Drives: 335i Join Date: Jun 2012 Location: Canberra, Australia iTrader: (0)	Any updates?? Has it thrown limp mode since flashing back??
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