Sudden power loss but no limp mode

blaze739 · 09-07-2010, 02:03 PM

I got a brand new problem that I thought i would share and hopefully get some input on. its happened to me 3 times in the past 2 months, but seems to happen at random. the car will be running fine throughout my drive, but suddenly i lose horsepower after 2500 rpms. from 1k to 2.5k the car accelerates pretty normal, but once i pass 2500, going WOT is no different than lightly touching the gas. even at full throttle, the car maybe accelerates 1 mph every 1-2 seconds. however, if i push the clutch in and push the gas, the revs jump up just as quickly as it normally does. i dont get any type of CEL or warning light and the car will continue to do this for the rest of my trip until i shut the engine off. once i start it back up, everything is fine. has anyone ever experienced this or have any clue what it might be?

i scanned the ECU after this happened the first time and i found a 29f2(fuel high pressure system) code. ive been having fuel pump issues for about a year now, but everytime i go for service, BMW gives me their latest and greatest "patch" instead of changing the pump. thanks for any input.

blaze739 · 09-11-2010, 12:11 AM

Nobody else has experienced this? Or have a clue as to what it might be?

lpphreakx06 · 09-11-2010, 12:28 AM

Check the diverter valve hoses

TMR · 09-11-2010, 04:03 AM

I got the same issue. i lose boost. No CE, no errors. I replaced my BOV and same issue. Restart the car and it goes back to normal.

joec500 · 09-11-2010, 04:16 AM

Quote:

Originally Posted by TMR

I got the same issue. i lose boost. No CE, no errors. I replaced my BOV and same issue. Restart the car and it goes back to normal.

I have had this happen to me in the past as well. Could be the throttle plate got jammed?

gt3fever · 09-11-2010, 04:20 AM

Im in the same boat.

the fault code i got are 2F0D (radiator blind) and 2EFE (electrical fan). might need to dealer it ...

gt3fever · 09-11-2010, 04:20 AM

btw, are you tuned or stock?

blaze739 · 09-11-2010, 11:08 AM

Quote:

Originally Posted by hipertech

btw, are you tuned or stock?

Just jb3 map 3

Quisp · 09-16-2010, 01:46 AM

I have been getting something other than reduced power but not the same as yours. During acceleration the engine will drop to 1000 rpm and pressing the gas pedal does nothing. The rpm will bounce up and down between 500 and 1500 rpm. The tach needle is literally bouncing up and down as the car idles up anddown. AS I mentioned pressing the gas pedaldoesnt do anything. Have to coast to the sideof the road and shut it off and restart.
Been to two dealerships and they cant figure out what is wrong.
Picking up the car tomorrow and I am getting frustrated that i just have to keep itlike this. Power is down, acceleration sluggish and anything but smooth. Happens diring acceleration like when passin gon the freeway, but not regularly.

Syndicategt · 09-16-2010, 01:53 AM

I had the same thing 2 days ago, no limp mode but felt like it. Scanned the car and got:

29DC:
29DC Cylinder injection switch-off
Error will cause a warning light
Error is not currently present
Test conditions have been completed
Short circuit or signal interruption

Upon restart the problem went away and hasn't come back.

09-07-2010, 02:03 PM	#1
blaze739 Private First Class 23 Rep 186 Posts Drives: E92 2008 335i - AW/CR Join Date: Mar 2009 Location: Yonkers, NY iTrader: (2) Garage List 2008 BMW 335i [9.34]	Sudden power loss but no limp mode I got a brand new problem that I thought i would share and hopefully get some input on. its happened to me 3 times in the past 2 months, but seems to happen at random. the car will be running fine throughout my drive, but suddenly i lose horsepower after 2500 rpms. from 1k to 2.5k the car accelerates pretty normal, but once i pass 2500, going WOT is no different than lightly touching the gas. even at full throttle, the car maybe accelerates 1 mph every 1-2 seconds. however, if i push the clutch in and push the gas, the revs jump up just as quickly as it normally does. i dont get any type of CEL or warning light and the car will continue to do this for the rest of my trip until i shut the engine off. once i start it back up, everything is fine. has anyone ever experienced this or have any clue what it might be? i scanned the ECU after this happened the first time and i found a 29f2(fuel high pressure system) code. ive been having fuel pump issues for about a year now, but everytime i go for service, BMW gives me their latest and greatest "patch" instead of changing the pump. thanks for any input.
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09-11-2010, 12:11 AM	#2
blaze739 Private First Class 23 Rep 186 Posts Drives: E92 2008 335i - AW/CR Join Date: Mar 2009 Location: Yonkers, NY iTrader: (2) Garage List 2008 BMW 335i [9.34]	Nobody else has experienced this? Or have a clue as to what it might be?
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09-11-2010, 12:28 AM	#3
lpphreakx06 Professional Moose Racer 325 Rep 7,509 Posts Drives: SG 335i E92 RIP + 2015 SS M3 Join Date: Jul 2008 Location: Bellevue, Wa iTrader: (25)	Check the diverter valve hoses __________________ Visit my blog anytime: http://www.sfpayments.com BMW Dream Team PNW Chapter, member #1 \|HP Autowerks \| AR DESIGN \| BMW PERFORMANCE \| STOP TECH \| Volk Racing\| AMS \| ARKYM
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09-11-2010, 04:03 AM	#4
TMR Brigadier General 398 Rep 3,159 Posts Drives: M3 Join Date: Jun 2008 Location: Torrance iTrader: (12)	I got the same issue. i lose boost. No CE, no errors. I replaced my BOV and same issue. Restart the car and it goes back to normal. __________________ 2015 M3 BPM Tuned, Eibach, Magnaflow and more www.tmrmzine.com/m3/f80 SOLD E92 Slēk Carbon Fiber Widebody M3 www.tmrmzine.com/m3/slek/ SOLD E92 335i Stage 3+ with all the toys www.tmrmzine.com/335/ SOLD E39 M5 Modded, What a great car! www.tmrmzine.com/m5/
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09-11-2010, 04:20 AM	#6
gt3fever Major 78 Rep 1,232 Posts Drives: 992 GT3, G87 Join Date: Oct 2008 Location: Socal, Taiwan iTrader: (15)	Im in the same boat. the fault code i got are 2F0D (radiator blind) and 2EFE (electrical fan). might need to dealer it ...
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09-16-2010, 01:46 AM	#9
Quisp Does not play well with others 83 Rep 1,787 Posts Drives: BMW Join Date: Apr 2007 Location: Arizona iTrader: (4)	I have been getting something other than reduced power but not the same as yours. During acceleration the engine will drop to 1000 rpm and pressing the gas pedal does nothing. The rpm will bounce up and down between 500 and 1500 rpm. The tach needle is literally bouncing up and down as the car idles up anddown. AS I mentioned pressing the gas pedaldoesnt do anything. Have to coast to the sideof the road and shut it off and restart. Been to two dealerships and they cant figure out what is wrong. Picking up the car tomorrow and I am getting frustrated that i just have to keep itlike this. Power is down, acceleration sluggish and anything but smooth. Happens diring acceleration like when passin gon the freeway, but not regularly. __________________
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09-16-2010, 01:53 AM	#10
Syndicategt Brigadier General 164 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	I had the same thing 2 days ago, no limp mode but felt like it. Scanned the car and got: 29DC: 29DC Cylinder injection switch-off Error will cause a warning light Error is not currently present Test conditions have been completed Short circuit or signal interruption Upon restart the problem went away and hasn't come back. __________________ 2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
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