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Discussion Starter · #1 · (Edited)
Recently there was a post here regarding the EML light and loss of power on a 318 E46. My wife's car developed the same problem and on a diagnostic computer it said Valvetronic unit. I phoned BMW and got a huge quote to supply and fit a new unit. I got other varying suggestions one being try the coil packs! However, I was on the phone to Mark (BMW breaker Straffan) regarding a different matter and I explained my problem. Straight away he said your problem is an air pipe at the top of engine underneath the plastic engine cover. He said these pipes are flimsy and often collapse. He was bang on. A similarly sized sturdier pipe from another engine fitted and the car is running fine ever since.
I have put this post here so that people don't (A) get ripped off or (B)dont spend a lot of time and effort chasing a problem!
When your car is being serviced next it would be worth your while checking the condition of the pipe or consider changing it for a sturdier one before the car lets you down.
 

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I had the same problem on a 318ci. That pipe ain't up to the job.
 

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i have a 2000 E46 318 that is losing power and i have been told it could be a number of different things. it would be great if that was all that was wrong with mine. could you explain exactly where i should be looking please?
 

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I have two in at the moment and neither of them got fixed with this. One had a faulty fuel relay one had a shagged valvetronic motor..... So sometimes they are to blame.
The hose however is a known culprit and BMW released a service advisorey on it.
 

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I have two in at the moment and neither of them got fixed with this. One had a faulty fuel relay one had a shagged valvetronic motor..... So sometimes they are to blame.
Agreed, the EML light itself is in no way specific at all. In this thread here, a faulty MAF was the cause of the EML light. But, a simple check of the condition of the hose is definitely worth a check before looking at the more expensive causes!

Also, just in case, you are referring to this light
, aren't you? The reason I ask, is because some people assume that this light
, is the Engine Management Light, when it's actually the "Check Engine" light.
 

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Discussion Starter · #6 · (Edited)
I have two in at the moment and neither of them got fixed with this. One had a faulty fuel relay one had a shagged valvetronic motor..... So sometimes they are to blame.
The hose however is a known culprit and BMW released a service advisorey on it.
After I changed the pipe I was told it would take about 15 to 30 mins for the shit to blow itself out and for the car to gradually start to rev properly. The guy Mark said that when replacing this pipe people expect the car to start running correctly straight away and don't give it enough time and then start changing other more expensive items that don't need changing at all. My diagnostic showed up as a valvetronic unit fault and the local BMW dealer also said that was the problem. I have to admit even after I was told I expected the car to run well straight away after changing the pipe. After twenty minutes driving and spluttering I thought it has to be the valvetronic unit and ten mins later the revs went up and she started to run smoothly. If I had given up sooner I would have brought it to BMW to replace the valvetronic unit and been convinced that was the problem. Once again thanks to Mark for a top tip and for saving me a small fortune!!
 

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Discussion Starter · #7 ·
i have a 2000 E46 318 that is losing power and i have been told it could be a number of different things. it would be great if that was all that was wrong with mine. could you explain exactly where i should be looking please?
If you take the plastic cover off the top of the engine you will see a kind of foam type pipe sitting at the top of the engine. My one almost looked like two pipes as it was collapsed in the centre. If your pipe is collapsed you can replace with any similar sized sturdier pipe or a rplacement OEM one for about 40 euros. If this is your problem your car won't run right straight away. You will need to drive it and rev it hard for 15 mins or so until she comes back to normal!
 

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After I changed the pipe I was told it would take about 15 to 30 mins for the shit to blow itself out and for the car to gradually start to rev properly. The guy Mark said that when replacing this pipe people expect the car to start running correctly straight away and don't give it enough time and then start changing other more expensive items that don't need changing at all. My diagnostic showed up as a valvetronic unit fault and the local BMW dealer also said that was the problem. I have to admit even after I was told I expected the car to run well straight away after changing the pipe. After twenty minutes driving and spluttering I thought it has to be the valvetronic unit and ten mins later the revs went up and she started to run smoothly. If I had given up sooner I would have brought it to BMW to replace the valvetronic unit and been convinced that was the problem. Once again thanks to Mark for a top tip and for saving me a small fortune!!

Trust me we tried all that before. The pipe issue is well documented however the valvetronic engine has quiet some issues beside the pipe and valvetrnc untis are one of them.
 

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EML issues

My 2004 316i was idling rough for a while and then one day the EML and check engine light came on. The car then wouldn't start. It kicks over and almost catches but then dies. I know its not the starter and not the battery and from past experience it seems that the engine isn't getting enough air. Sure enough I pulled the plastic cover off and found that the air pipe looked like it was two pipes because of the crease down the middle.

So before I have it towed to a mechanic I thought I would try replacing the pipe. Does anyone have the part number or the actual name of the air pipe so that I can order a replacement part online?

Cheers
 

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I would be interested to know also if there is a similar air pipe in the same location on a 6 pot engine? I am beginning to suspect a slight leak or something in my hoses and if this is a simple enough fix then I would like to try it, if of course it can be done on the 325 E46!!
 

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316 e46 error lights galore!!!!

Hello. Have a 316 compact. Car started to lose power and check engine light came on. Mech told me that the mass air flow sensor came up on diagnostics. Changed that. Still no better. Checked diag again. Got 2 more errors. Valvetronic adapt. O2 sensor and mass air flow sensor again! Saw thread about pipe under the engine covwr. Had a look and there is a bit of a crease but nothing major. Dont know what to do mow as im afraid of throwing money that i cant afford into the car when it might be a simple pipe needing to be rwplacwd. Anyone any thoughts on this.
 

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If you take the plastic cover off the top of the engine you will see a kind of foam type pipe sitting at the top of the engine. My one almost looked like two pipes as it was collapsed in the centre. If your pipe is collapsed you can replace with any similar sized sturdier pipe or a rplacement OEM one for about 40 euros. If this is your problem your car won't run right straight away. You will need to drive it and rev it hard for 15 mins or so until she comes back to normal!
Is the pipe/hose in question under the cover that is fixed on with screws (on the right looking in) I can't seem to locate the bleedin' thing. Anybody got a picture of the pipe location? thanks.
 

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EML and ASC light problem

If you take the plastic cover off the top of the engine you will see a kind of foam type pipe sitting at the top of the engine. My one almost looked like two pipes as it was collapsed in the centre. If your pipe is collapsed you can replace with any similar sized sturdier pipe or a rplacement OEM one for about 40 euros. If this is your problem your car won't run right straight away. You will need to drive it and rev it hard for 15 mins or so until she comes back to normal!
===================================
Could you please post or email me a photo of the hose you mention I have the same issue with my car.
Thanks
[email protected]
 

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Part number

Hi, the replacement of the pipe solved my EML light problem on my E46 318i as well! The part number is 11 15 7 503 524. The description used was "Vent Hose E46"
 
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