M50 idle problem

Post Tue Feb 17, 2009 10:56 pm

basically it goes up and down at a steady pace from 500 to 1200 rpm, theres no air leak, it's not the icv as i changed it for a working one. Only thing that makes a difference is if I disconnect the afm, it gets better but still shunts up and down.

Any ideas

Post Wed Feb 18, 2009 4:30 pm

Mine does the same, but only sometimes. I was looking in to it untill my other car broke.

Let me know how you get on with this one....

I could do with an answer too!

Post Wed Feb 18, 2009 4:35 pm

Cleaned the ICV?

Post Wed Feb 18, 2009 4:40 pm

georob wrote:Cleaned the ICV?

Yup!

Post Wed Feb 18, 2009 4:43 pm

Bugger, no idea then mate

Post Wed Feb 18, 2009 4:44 pm

Seems to be a common M50 issue..

Have you checked the intake elbow? Particularly where the pipe joins from underneath?

Post Wed Feb 18, 2009 4:49 pm

Jhonno wrote:Seems to be a common M50 issue..

Have you checked the intake elbow? Particularly where the pipe joins from underneath?

Can you elaborate on this? There’s two pipes going to the bottom of my inlet elbow and the elbow itself is slightly cracked where these join. I’ve jubilee clipped them and I’m pretty sure they are not leaking ”“ but if this is a cause of this problem it seems a bit obvious!

Post Wed Feb 18, 2009 7:04 pm

I don't think I have an air leak. A leak big enough to cause this kind of rpm change would be pretty obvious and i've used two cans of brake cleaner looking for any kind of leak.

Post Wed Feb 18, 2009 8:44 pm

My one does this if battery is removed , it will keep doing it for 30 / 1 hour of driving getting beter and better , My tps went faulty so replaced it with a new one but this still happens if battery is removed

Post Wed Feb 18, 2009 11:00 pm

Dafs just buy a new elbow, for the price theyre not worth patching up. If you want a diagnostic I can give you a shout next time im over your way

Post Thu Feb 19, 2009 12:33 am

DanThe wrote:Dafs just buy a new elbow, for the price theyre not worth patching up

+1

Post Thu Feb 19, 2009 8:42 am

Ok! Will give BM a phone call this morning!

Dan if you could run a diagnostic on it again that would be great, I have the odd occasion when it bogs down with very little power, it might show me if there is something playing up

In exchange for another couple of koenigseggs.

Post Thu Feb 19, 2009 8:50 am

an elbow is £14 from BMW, I had to buy one last week

Post Thu Feb 19, 2009 8:58 am

You don't happen to have the part number before I spend ages trying to find it on realoem do you?

Post Thu Feb 19, 2009 11:10 am

http://www.realoem.com/bmw/showparts.do ... g=13&fg=15

item number 3? 13541726634

Post Thu Feb 19, 2009 11:24 am

Thankyouverymcuh!

Post Thu Feb 19, 2009 11:30 am

mine had been cable tied on one of the two pipes that come out the bottom of the elbow and was causing an air leak, even though the cable tie looked to have sealed it

Post Thu Feb 19, 2009 11:50 am

rossmc88 wrote:mine had been cable tied on one of the two pipes that come out the bottom of the elbow and was causing an air leak, even though the cable tie looked to have sealed it

Sounds just like mine - except I have used jubilee clips! Doesn't really explain the intermitence though

Post Thu Feb 19, 2009 2:33 pm

Its a deal,,,

Post Thu Feb 19, 2009 2:51 pm

Just let me know when because trying to source it is quite a challange

Post Thu Feb 19, 2009 2:57 pm

Week on Saturday is the next time I will be close

Post Thu Feb 19, 2009 3:32 pm

We're going up to York give Lee a hand then, but now that the car is mobile I could bring it to you. Any excuse to drive it at the moment