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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > 1st POST .👍 Engage Clutch & Revs Bog



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      01-17-2020, 04:18 PM   #1
ScottUK
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1st POST .👍 Engage Clutch & Revs Bog

Ok so Hey Guys (Stock n54 135i 76k) I've noticed today whilst on idle the engine will respond normal to the Thottle Position. Until the clutch is engaged then it completely loses responsiveness and becomes sluggish to rev from idle.
Also in the last few 100 miles I'm down on power especially 3rd,4th,5th ,& 6th.
About 500miles ago it was driven hard and threw a few p30fe Overboost codes over a few days . Then they disappeared and I've not had a any code since. I have completely erratic data from B1S1 & I think maybee it was damaged from the heat from the few Overboost Eposode. I deffinatly had noticeable WG rattle for a day after the overboost aswell .
The rattle is not there anymore either which kinda makes me think its binding and not completely closing .
Any ideas would be appreciated cheers guys.
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      01-17-2020, 05:43 PM   #2
aaronblack
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I've got a N53 which from my understanding is a similar engine but of course n/a.

I've experience similar situation whereby clutch in the rev jumps/climbs nicely yet clutch out it's very slow. I also can't keep the revs still at let's say 1k it will fluctuate!

From everything I've read it's injectors, hopefully someone can shed some light on this
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      01-18-2020, 01:21 AM   #3
ScottUK
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Yeah alot of ppl post about idle fluctuations with clutch commands but thats pretty normal , most cars will idle a little higher as soon as the clutch switch is activated, this is just to compensate for the extra load on the engine.
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      01-18-2020, 02:54 AM   #4
Tambohamilton
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Quote:
Originally Posted by ScottUK View Post
this is just to mask extra vibration that the slightly lighter flywheel mass would cause.
FTFY The extra load on the engine from spinning the clutch release bearing is negligible, unless your release bearing is goosed and about to melt.

Sorry I can't help with your actual problem.
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