Half engine light!

SmAcKs · 07-28-2013, 12:11 AM

I did a few WOT's then went home. An hour later I got back into my car drove for about 10 seconds and then I got the half engine light... I turned around went back home and ran the codes and nothing came up! When the half engine light came in it said reduced power but it felt normal..

I turned the car back on a proceeded tonwhere I was going and no engine light came on and everything was fine..

Should I be worried or is that normal?

GraphiteAZ335 · 07-28-2013, 12:53 AM

I will get the main question out there right away... What tune and modifications? If any.

SmAcKs · 07-28-2013, 12:59 AM

Quote:

Originally Posted by GraphiteAZ335

I will get the main question out there right away... What tune and modifications? If any.

Jb4, DCI, vrsf DP's, 4 gallons of e85

SmAcKs · 07-28-2013, 01:00 PM

This happen to anyone else?!

E92ML · 07-28-2013, 01:01 PM

This happens to me every few weeks

SmAcKs · 07-28-2013, 01:33 PM

Quote:

Originally Posted by E92ML

This happens to me every few weeks

You just don't worry about it anymore?

E92ML · 07-28-2013, 01:39 PM

Quote:

Originally Posted by SmAcKs

You just don't worry about it anymore?

Yeah, it never seems to effect much and I spent a long time trying to figure out what the problem with no avail. Very rarely the car will idle roughly but I haven't noticed anything else besides that. I think that symbol represents half engine power but I still have full power when the light comes on.

I think it has something to do with the tune/downpipes.

SmAcKs · 07-28-2013, 01:49 PM

Quote:

Originally Posted by E92ML

Quote:

Originally Posted by SmAcKs

You just don't worry about it anymore?

Yeah, it never seems to effect much and I spent a long time trying to figure out what the problem with no avail. Very rarely the car will idle roughly but I haven't noticed anything else besides that. I think that symbol represents half engine power but I still have full power when the light comes on.

I think it has something to do with the tune/downpipes.

Ooo cool thanks for the info man I appreciate it

colinpemon · 08-19-2013, 05:45 PM

I have a similar problem. 2007 335i cab, no mods, after 1st half hour track session, got half engine light. No power loss then, and would disappear when engine off. Later track runs with firm braking and lots of WOT, light on and significant power loss. Again, no prob after the track day- drove home w/o problem.
Any suggestions?

enrita · 08-19-2013, 06:02 PM

yeah read the codes...

dlbrooks18 · 08-19-2013, 06:43 PM

So not even shadow codes?

colinpemon · 09-22-2013, 08:34 PM

Went to the dealer for service. Lots came up on codes including wastegates and vanos but dealer said it was normal for the car to power back to protect itself. This doesn't make sense to me. Surely a 335 is meant to be driven.
What do people think. I do want to be able to do track stuff

cortega · 09-22-2013, 10:37 PM

Happened to me yesterday, after picking the car from the dealer for the recall. Half engine light twice but no noticeable loss of power. Tried to pull up codes but nothing showed up (maybe I didn't do it right). It was just normal driving, no WOT. BTW the SA told me that it was time to replace the plugs, but for $350 I'll do it myself. I'll try that first to see if that get rid of it.

07-28-2013, 12:11 AM	#1
SmAcKs Private First Class 8 Rep 96 Posts Drives: BMW 335i BLACK Join Date: Apr 2013 Location: Castaic, California iTrader: (1)	Half engine light! I did a few WOT's then went home. An hour later I got back into my car drove for about 10 seconds and then I got the half engine light... I turned around went back home and ran the codes and nothing came up! When the half engine light came in it said reduced power but it felt normal.. I turned the car back on a proceeded tonwhere I was going and no engine light came on and everything was fine.. Should I be worried or is that normal?
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07-28-2013, 12:53 AM	#2
GraphiteAZ335 New Member 0 Rep 21 Posts Drives: 2007' 335i Join Date: Jun 2013 Location: Tucson, AZ / Ft. Hood, TX iTrader: (0)	I will get the main question out there right away... What tune and modifications? If any. __________________ 07' E90 335i - Sparkling Graphite Metallic - It's a Four Door..
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07-28-2013, 01:00 PM	#4
SmAcKs Private First Class 8 Rep 96 Posts Drives: BMW 335i BLACK Join Date: Apr 2013 Location: Castaic, California iTrader: (1)	This happen to anyone else?!
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07-28-2013, 01:01 PM	#5
E92ML Captain 34 Rep 886 Posts Drives: E92 2008 335xi Coupe Join Date: May 2011 Location: Bellevue, WA iTrader: (0)	This happens to me every few weeks __________________ Performance: JB4 ECU, CP-E DP's, WW BMS Meth Kit, AR meth elbow, BMS DCI, AFE Intake Scoops, Exterior: Enkruez 19" H8R, H&R Spacers, Aero Lip, Tint, ACS Roof Spoiler, HID AE's, HID Fogs, Black Grills, Sport Pedals
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08-19-2013, 05:45 PM	#9
colinpemon Registered 0 Rep 2 Posts Drives: 2007 335i convertible Join Date: Aug 2013 Location: Ontario, Canada iTrader: (0)	I have a similar problem. 2007 335i cab, no mods, after 1st half hour track session, got half engine light. No power loss then, and would disappear when engine off. Later track runs with firm braking and lots of WOT, light on and significant power loss. Again, no prob after the track day- drove home w/o problem. Any suggestions?
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08-19-2013, 06:02 PM	#10
enrita Major General 161 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	yeah read the 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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08-19-2013, 06:43 PM	#11
dlbrooks18 Brigadier General 164 Rep 3,735 Posts Drives: e90 335i Join Date: Nov 2008 Location: Los Angeles iTrader: (2)	So not even shadow codes? __________________ 2008 E90 335
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09-22-2013, 08:34 PM	#12
colinpemon Registered 0 Rep 2 Posts Drives: 2007 335i convertible Join Date: Aug 2013 Location: Ontario, Canada iTrader: (0)	Half engine light Went to the dealer for service. Lots came up on codes including wastegates and vanos but dealer said it was normal for the car to power back to protect itself. This doesn't make sense to me. Surely a 335 is meant to be driven. What do people think. I do want to be able to do track stuff
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09-22-2013, 10:37 PM	#13
cortega Private 26 Rep 76 Posts Drives: 2014 F13 M6 Join Date: Mar 2010 Location: Puerto Rico iTrader: (0)	Happened to me yesterday, after picking the car from the dealer for the recall. Half engine light twice but no noticeable loss of power. Tried to pull up codes but nothing showed up (maybe I didn't do it right). It was just normal driving, no WOT. BTW the SA told me that it was time to replace the plugs, but for $350 I'll do it myself. I'll try that first to see if that get rid of it.
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