BMW Forums : BimmerForums banner

1 - 9 of 9 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter #1
hi all,
just got the car yesterday from a garage, it was fine on a test drive last weekend (has been serviced by the garage i bought it from since then).
my partner drove it from newcastle to edinburgh yesterday, it drives fine but when you pull up to a stop, the idle sits at about 900 rpm for a few seconds,then increases to 1700 rpm before suddenly dropping back down to 900 rpm again. it just sits and does this when not driving.
as the revs are rising, if you give the throttle a quick blip the revs will drop back down again.
i wonder if maybe the mechanic who did the service has forgotten to reconnect a vacuum tube or something ? really dont know, had quick glance under the bonnet and didnt see anything amiss, not that you can see much!
will ring the garage this afternoon, but it;s a pain as theyre in newcastle and we are in edinburgh.
thanks,.
col
 

·
Registered
Joined
·
238 Posts
By way of huge coincidence, my dad just phoned me about his E46 318ci 01 doing this. At a red light, in neutral, the idle speed creeps up to 2000rpm.

My E46 is a 6 cyl, so I can't help him.

Is this the issue with the breather hose at the back of the block?
 

·
Registered
Joined
·
5 Posts
Discussion Starter #3
well,i just got off the phone to the garage and they said it wasnt doing it when they brought it back from their workshops, so if it is a breather then it's maybe popped off. any idea if you can see it if you look, or do you need to pop engine covers etc.?
the garage basically said take it to a local garage for a check, as it must be something simple like that.
it's peeing down here just now so cant really look 8 (
cheers

update : just had a look under bonnet and couldnt see anything, though you really cant get at much!maybe needs to be up on a ramp
 

·
Registered
Joined
·
238 Posts
Try reading here about that dodgy hose:

http://www.bimmerwerkz.com/forum/3-series-e46-e90/318ci-idle-problems-52883.html (read down the page)

http://www.bmwland.co.uk/forums/viewtopic.php?p=426351 (this guy spent money on every part going, swaping bits until he found the cure)

http://www.e46zone.com/forum/index.php?showtopic=5608 (hose change is second part down, with imbedded pic links to click on)

http://media.photobucket.com/image/crankshaft breather pipe bmw e46/gillstill/DIY4.jpg (Pic of the hose location after pollen filter is removed)

http://www.realoem.com/bmw/showparts.do?model=BL32&mospid=47610&btnr=11_1514&hg=11&fg=15 (exploded BMW diagram showing hose and valve)

http://forum.e46fanatics.com/showthread.php?t=660192 (excellent guide with pics)

http://www.bimmerforums.co.uk/forum/f18/2000-e46-318ci-rev-hunting-t32835/ (more info)
 

·
Super Moderator
Joined
·
12,946 Posts
make sure ya dipstcick is firmly seated and the oil filler is on correct first, it points to unmetered air entering the engine..
 

·
Registered
Joined
·
5 Posts
Discussion Starter #6
cheers lotuschris, will have a look at those when i get a chance later on.
dailydoggy,oil filler and dipstick seem seated fine.

just rang my local garage we use, and they said it sounds like either a pipe popped off or a throttle position sensor.said they would pop it on the diagnostic machine, sadly they are busy and cant take it in till later on in the week.

anyone know off the top of their head if it's possible to get at the pipe? i have a trolley jack but no access to proper car ramps.

cheers,
col
 

·
Registered
Joined
·
238 Posts
Check the links out. It is at the base of the windscreen, under the pollen filter. It is accessible without the use of any tools, and from the top with just the bonnet open.
 

·
Registered
Joined
·
5 Posts
Discussion Starter #9
hi all,
our garage had a good look at it, checked the breather and other stuff with nothiung obvious.it now doesn't do it all the time, but still does it most of the time.
they reckoned next step is to remove inlet manifold as there is some sort of valve thing in there which recirculates exhaust gases at low revs asnd a few other things which they reckon it could be. them doing this isn't an option for us as the garage we bought the car should obviously be doing this (they have said they will fix it but won't pay for another gfarage to do it, the prob for us being theyre in newcastle and us in edinburgh).
our garage also added that when they removed a breather (allowing air to flow into the engine) the problem went away, so they suspect cracked breather or similar.
sooooooo next friday we are off to newcastle with the car, fingers crossed they can fix it that day.
will post when got news,
cheers,
col
 
1 - 9 of 9 Posts
Top