07 335i - Loss of power + WOT causes half engine light

synapse88 · 06-24-2016, 06:07 PM

I had misfires and hesitation for about a year, and recently had an injector and coil pack replaced which fixed that issue, but I didn't have overall loss of power before the fix.

Now I have a noticeable loss in power (down 30-40% I'd say) at all RPMs, and if I push it hard to wide open throttle (or close) I get the half engine warning light.

Any ideas what it could be?

More info: 73k miles, intake hasn't been walnut blasted yet, have also had the HPFP and LPFP changed in the past. I also changed the plugs and one of the coil packs 10k-15k miles ago.

Bamaben · 06-24-2016, 07:27 PM

Mine was a bad turbo vacuum cannister that caused those symptoms

synapse88 · 06-28-2016, 11:26 AM

How did you troubleshoot that?

mxchris727 · 06-28-2016, 12:13 PM

Check the vacuum lines that run behind the oil filter cap all of the way to the turbos. They crack with heat cycles and cause the turbos to not spool up.

Vincent_E90 · 06-28-2016, 12:20 PM

The check control msgs dont help us at all, if you want to get closer to the problem we need the engine codes

like these: https://cobbtuning.zendesk.com/hc/en...otential-Fixes

synapse88 · 07-01-2016, 02:28 PM

^ Will those $30 ODB readers give me those codes, or do I need one of the fancy computers to get at them?

^^ Will do thanks!

Vincent_E90 · 07-07-2016, 06:38 PM

Quote:

Originally Posted by synapse88

^ Will those $30 ODB readers give me those codes, or do I need one of the fancy computers to get at them?

^^ Will do thanks!

If im not mistaken a cheap 30 OBD will only read 'services engine soon' engine lights. BMW's have these things called ghost codes that will make your car go in to limp mode, as your experiencing, but will not trigger a SES light. i use my COBB tuner if you have a buddy with one he can prob check your codes or buy a carly bmw https://www.amazon.com/Original-Carl.../dp/B00X3UYXM0

mweisdorfer · 07-08-2016, 12:02 AM

Could be a broken or disconnected charge pipe?

samuelmccarthy13 · 07-08-2016, 01:35 AM

You need to read the codes and find out what is causing the SES light. Only way to properly diagnose the problem

Tucker020 · 07-08-2016, 03:57 PM

I'd be willing to bet that it's another coil pack. I've replaced so so many now. Sometimes I would get just intermittent misfires, other times I would get half engine light and way reduced power.

I took the tune off of my car, and have not had to replace a single coil pack in almost a year now.

06-24-2016, 06:07 PM	#1
synapse88 Enlisted Member 13 Rep 47 Posts Drives: 2007 335i Join Date: Oct 2010 Location: NC iTrader: (0)	07 335i - Loss of power + WOT causes half engine light I had misfires and hesitation for about a year, and recently had an injector and coil pack replaced which fixed that issue, but I didn't have overall loss of power before the fix. Now I have a noticeable loss in power (down 30-40% I'd say) at all RPMs, and if I push it hard to wide open throttle (or close) I get the half engine warning light. Any ideas what it could be? More info: 73k miles, intake hasn't been walnut blasted yet, have also had the HPFP and LPFP changed in the past. I also changed the plugs and one of the coil packs 10k-15k miles ago.
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06-24-2016, 07:27 PM	#2
Bamaben Major 183 Rep 1,082 Posts Drives: 07 335i blk/blk/alum 6MT Join Date: Jun 2010 Location: Bimmertown iTrader: (0)	Mine was a bad turbo vacuum cannister that caused those symptoms __________________ It takes a big man to cry. It takes an even bigger man to laugh at him-- Jack Handey mods: blackout grill, finishing rods, badges, Blacklines.
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06-28-2016, 11:26 AM	#3
synapse88 Enlisted Member 13 Rep 47 Posts Drives: 2007 335i Join Date: Oct 2010 Location: NC iTrader: (0)	How did you troubleshoot that?
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06-28-2016, 12:13 PM	#4
mxchris727 Captain 195 Rep 665 Posts Drives: '03 M5, '06 325i, '12 M3 Join Date: Aug 2012 Location: Westport, CT iTrader: (0)	Check the vacuum lines that run behind the oil filter cap all of the way to the turbos. They crack with heat cycles and cause the turbos to not spool up. __________________ BMW GT1 (INPA, DIS, WinKFP, ect..), ISTA/P & /D is up and running! PM me if you want to stop by and code your car.
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06-28-2016, 12:20 PM	#5
Vincent_E90 Second Lieutenant 81 Rep 241 Posts Drives: N54 E90 335i 6MT BSM Join Date: Sep 2014 Location: North Lake Tahoe, CA iTrader: (1)	The check control msgs dont help us at all, if you want to get closer to the problem we need the engine codes like these: https://cobbtuning.zendesk.com/hc/en...otential-Fixes __________________ Mine - 2008 E90 335i Black Sapphire Metallic 6MT \| New OEM Turbos @ 111k\| Cobb Stage 2 LT Sport \| Full Stainless Steel Akrapovic Exhaust \| 5'' Stepped FMIC \| VRSF Catless Downpipes\| 19in BBS CH-R Matte Black \| aFe Stage 2 Air Intake and air scoops\| Mishimoto OCC\| M-Tech Front Bumper
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07-01-2016, 02:28 PM	#6
synapse88 Enlisted Member 13 Rep 47 Posts Drives: 2007 335i Join Date: Oct 2010 Location: NC iTrader: (0)	^ Will those $30 ODB readers give me those codes, or do I need one of the fancy computers to get at them? ^^ Will do thanks!
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07-08-2016, 12:02 AM	#8
mweisdorfer Major General 1940 Rep 6,965 Posts Drives: 2007 Black/Black 335i e90 Join Date: Apr 2011 Location: Holly, MI iTrader: (0) Garage List 2007 BMW E90 335i [0.00] 2008 bmw x5 [0.00]	Could be a broken or disconnected charge pipe?
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07-08-2016, 01:35 AM	#9
samuelmccarthy13 Private First Class 28 Rep 193 Posts Drives: BMW 335i e90 2007 Sedan Join Date: Aug 2015 Location: NSW Australia iTrader: (0)	You need to read the codes and find out what is causing the SES light. Only way to properly diagnose the problem
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07-08-2016, 03:57 PM	#10
Tucker020 Private 5 Rep 71 Posts Drives: 2007 335i E93 Join Date: Mar 2012 Location: Texas iTrader: (1)	I'd be willing to bet that it's another coil pack. I've replaced so so many now. Sometimes I would get just intermittent misfires, other times I would get half engine light and way reduced power. I took the tune off of my car, and have not had to replace a single coil pack in almost a year now.
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