Keep getting "engine Malfunction" light with no code

natedog7700 · 06-04-2015, 09:45 PM

Whenever im cruising on the freeway in 6th gear, sometimes I will get the "engine malfunction reduced power mode". Mainly happens under half throttle ish. Mid boost (10psi). No codes pop up, nothing seems to be wrong except the dam "reduced power mode". Why cant it atleast throw a code so I know whats going on?

Jeff@TopGearSolutions · 06-04-2015, 09:49 PM

How many miles on the spark plugs? What are you using to check codes?

You can usually find stored codes that start with an "H" meaning they aren't "present" but in "history".

Milan · 06-04-2015, 09:59 PM

had that problem too, ended up being my vanos solenoids

natedog7700 · 06-04-2015, 10:04 PM

Quote:

Originally Posted by Milan

had that problem too, ended up being my vanos solenoids

I replaced both of them 5K miles ago.

natedog7700 · 06-04-2015, 10:05 PM

Quote:

Originally Posted by Jeff@TopGearSolutions

How many miles on the spark plugs? What are you using to check codes?

You can usually find stored codes that start with an "H" meaning they aren't "present" but in "history".

Plugs have maybe 2K on them max. I have a OBD reader but with no "real" codes nothing will pop up. I do have the MHD flasher off my phone though I guess I could take a look and see if that shows anything. Hmm

natedog7700 · 06-05-2015, 03:04 PM

Any chance it could be the diverter valves messing with my boost and throwing the light? (im on stock DVs)

enrita · 06-05-2015, 03:45 PM

codes should be stored , do you have a piggyback with auto clear codes?

natedog7700 · 06-05-2015, 04:54 PM

Quote:

Originally Posted by enrita

codes should be stored , do you have a piggyback with auto clear codes?

I only have the MHD flash, no piggy back.

Sgop335 · 06-05-2015, 05:36 PM

Quote:

Originally Posted by natedog7700

I only have the MHD flash, no piggy back.

Did you check code w mhd codes?

Does engine mal happen on stock?

natedog7700 · 06-14-2015, 06:40 PM

Quote:

Originally Posted by Sgop335

Did you check code w mhd codes?

Does engine mal happen on stock?

Sorry for the late response, but it never happened again. I re flashed with MHD from ken, with the same map but slightly tweaked for boost lag. I also upped my E85 content (I was running it really low at 30% because of HPFP leaning out).

The codes that MHD showed:

3100 Boost-pressure control, deactivation

2D25 manipulation cover, maximum air mass

2DED Power Management, Standby Current Control

30FE Turbocharger, Charge-air pressure to high

Shadow codes:

2FA3 coding missing
2AAF fuel pump plausibility
29F4 Cat conv
29F5 cat conv 2

06-04-2015, 09:45 PM	#1
natedog7700 Captain 660 Rep 780 Posts Drives: 07 335i RB's 625whp Join Date: Nov 2013 Location: milwaukee wi iTrader: (0)	Keep getting "engine Malfunction" light with no code Whenever im cruising on the freeway in 6th gear, sometimes I will get the "engine malfunction reduced power mode". Mainly happens under half throttle ish. Mid boost (10psi). No codes pop up, nothing seems to be wrong except the dam "reduced power mode". Why cant it atleast throw a code so I know whats going on?
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06-04-2015, 09:49 PM	#2
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	How many miles on the spark plugs? What are you using to check codes? You can usually find stored codes that start with an "H" meaning they aren't "present" but in "history".
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06-04-2015, 09:59 PM	#3
Milan Captain 202 Rep 649 Posts Drives: F80 M3 Join Date: May 2014 Location: Boise, ID iTrader: (7)	had that problem too, ended up being my vanos solenoids __________________ 17 M3 Comp
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06-05-2015, 03:04 PM	#6
natedog7700 Captain 660 Rep 780 Posts Drives: 07 335i RB's 625whp Join Date: Nov 2013 Location: milwaukee wi iTrader: (0)	Any chance it could be the diverter valves messing with my boost and throwing the light? (im on stock DVs)
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06-05-2015, 03:45 PM	#7
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	codes should be stored , do you have a piggyback with auto clear codes? __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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