335d - no power until 3000 rpm -FIXED

superflyguy9 · 09-16-2012, 08:43 AM

2007 335d standard. Thought i was going mad as the power depleted over weeks possibly months. I have owned her since Jan 2012 so i remember she was quick when i got her, but you obviously get used to the power drop off.

Anyway, power went pretty much completely from Thursday last week - the usual nothing until 3000rpm then warp speed.

Read the various posts on here and concluded probably pressure converter, possibly red boost hose (as it had oil on the underside) and remote possibility a fractured vacuum hose.

Used the guides on here to expose the pressure converted and noticed one of the small braided hoses the goes from a T piece into the pressure converter looked very ragged at the bend - I prodded and sure enough it was worse for wear.

Now I am "Mr Lucky" when it comes to pretty much everything. Last week I got a letter from Readers Digest saying "unfortunately you havent been selected for this months prize draw". lol. So you can imagine my doubt that this was the cause, I wasnt even sure if it had fractured. Anyway after debating I thought while I have some spare silicon boost hose the correct diameter - what the heck. The piece measured 10 cm or so.

Replaced it and bingo - I have a new car again!

Big thanks to Mistryn et al for their threads etc that allowed me to do the investigation work that fixed the problem. Suppose i should replace all the other hoses now

Hope this helps someone else with a similar problem.

mistryn · 09-16-2012, 02:25 PM

Nice one glad you got it sorted and found my threads helpfull

If yo did want to buy vacuum hose, gsf car parts seel them at £3 per metre and they loko exactly the same as oem

Mustard3 · 09-17-2012, 02:43 AM

Good to hear you fixed it without having to throw lots of money at it.

dxb335d · 09-17-2012, 03:32 AM

How is yours Mustard?!

Mustard3 · 09-17-2012, 04:08 AM

Hi mate, I'm taking it in to PMW at Chelmsford tomorrow. I've done all the obvious checks and replaced various sensors but my confidence doesn't extend to replacing pressure converters + vac pipes or anything more tricky, so we'll see what they find.

My problem sounds similar to Superflyguy but have had a gradual power loss over 3 months ABOVE 3000 revs at full throttle. Over a certain stretch where it would previously accelerate up to 87, it will now only reach 74, but kept below 3000 revs and part throttle you wouldn't know there was a problem.

Hopefully I'll have it sorted shortly - will definitely get it along to Santa Pod, might see you there next month!

09-16-2012, 08:43 AM	#1
superflyguy9 Private 2 Rep 54 Posts Drives: 335d F30 xdrive 2016 Join Date: Feb 2012 Location: Manchester, UK iTrader: (0)	335d - no power until 3000 rpm -FIXED 2007 335d standard. Thought i was going mad as the power depleted over weeks possibly months. I have owned her since Jan 2012 so i remember she was quick when i got her, but you obviously get used to the power drop off. Anyway, power went pretty much completely from Thursday last week - the usual nothing until 3000rpm then warp speed. Read the various posts on here and concluded probably pressure converter, possibly red boost hose (as it had oil on the underside) and remote possibility a fractured vacuum hose. Used the guides on here to expose the pressure converted and noticed one of the small braided hoses the goes from a T piece into the pressure converter looked very ragged at the bend - I prodded and sure enough it was worse for wear. Now I am "Mr Lucky" when it comes to pretty much everything. Last week I got a letter from Readers Digest saying "unfortunately you havent been selected for this months prize draw". lol. So you can imagine my doubt that this was the cause, I wasnt even sure if it had fractured. Anyway after debating I thought while I have some spare silicon boost hose the correct diameter - what the heck. The piece measured 10 cm or so. Replaced it and bingo - I have a new car again! Big thanks to Mistryn et al for their threads etc that allowed me to do the investigation work that fixed the problem. Suppose i should replace all the other hoses now Hope this helps someone else with a similar problem. __________________
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09-16-2012, 02:25 PM	#2
mistryn Colonel 147 Rep 2,048 Posts Drives: BMW 335D Join Date: Oct 2011 Location: Mids iTrader: (8)	Nice one glad you got it sorted and found my threads helpfull If yo did want to buy vacuum hose, gsf car parts seel them at £3 per metre and they loko exactly the same as oem
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09-17-2012, 02:43 AM	#3
Mustard3 Lieutenant 99 Rep 403 Posts Drives: F31 340i Join Date: Sep 2011 Location: UK iTrader: (1)	Good to hear you fixed it without having to throw lots of money at it.
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09-17-2012, 03:32 AM	#4
dxb335d The Tarmac Terrorist 949 Rep 29,345 Posts Drives: 997.2 GT3 Join Date: Mar 2007 Location: ''Fandango Towers'' iTrader: (3) Garage List 2010 Porsche 997.2 GT3 [9.50] 2003 BMW E46 M3 [6.00] 2007 BMW E92 335D [5.50]	How is yours Mustard?! __________________ 997.2 GT3
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09-17-2012, 04:08 AM	#5
Mustard3 Lieutenant 99 Rep 403 Posts Drives: F31 340i Join Date: Sep 2011 Location: UK iTrader: (1)	Hi mate, I'm taking it in to PMW at Chelmsford tomorrow. I've done all the obvious checks and replaced various sensors but my confidence doesn't extend to replacing pressure converters + vac pipes or anything more tricky, so we'll see what they find. My problem sounds similar to Superflyguy but have had a gradual power loss over 3 months ABOVE 3000 revs at full throttle. Over a certain stretch where it would previously accelerate up to 87, it will now only reach 74, but kept below 3000 revs and part throttle you wouldn't know there was a problem. Hopefully I'll have it sorted shortly - will definitely get it along to Santa Pod, might see you there next month!
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