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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > N20 Blue smoke on start up
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      04-28-2021, 06:29 AM   #23
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the dealer is now saying the 'smoke' is 'steam' coming from some water in the exhaust.
and refused to change the oil feed pipe that i agreed to pay £750 for them to do.

they are now charging me for a work relating to draining water from an exhaust back box that i DID NOT agree to!
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      04-28-2021, 12:34 PM   #24
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That looks just like mine if I had left it for a few days. The test you should do, is like what I did in here.


Let the smoke clear on start up - then warm it up, let it idle for 5-10 mins then give it some Revs to check it's not valve seals or turbo seals.

I am confident it's this pipe, or your turbo seals have gone. I was lucky because I caught it early and I did the work myself so only cost £50.

I think I put the pipe part number up and you can order from bmw parts department. Maybe an indy will fit?
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      04-30-2021, 04:03 AM   #25
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Quote:
Originally Posted by DG330 View Post
That looks just like mine if I had left it for a few days. The test you should do, is like what I did in here.


Let the smoke clear on start up - then warm it up, let it idle for 5-10 mins then give it some Revs to check it's not valve seals or turbo seals.

I am confident it's this pipe, or your turbo seals have gone. I was lucky because I caught it early and I did the work myself so only cost £50.

I think I put the pipe part number up and you can order from bmw parts department. Maybe an indy will fit?
Thanks,
i've already checked the exhaust when warm after a run out, revving it up no smoke at all.
i'll probably have no choice but see if i can find a good indy locally.

as after calling me about the exhaust, i refuted that was the issue, and wanted them to continue with the repair to the oil feed line and turbo.

the dealership ignored me and point blank refused to do the repair that we had agreed from the initial investigation work that i had paid for... to replace the turbo oil pipe and check the turbo for oil leaks.
and did the work that they decided to do...

they then charged me £289 to tip some water out of the exhaust, and let me have my car back...

i can't understand how something as simple as asking for a repair to be done is made to be so difficult...
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Last edited by davethefish; 04-30-2021 at 04:36 AM..
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      05-01-2021, 05:10 AM   #26
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Think you visited the stealer......

Jokes aside, my dealer were pretty useless about this issue. My service agent who is a nice chap said it was probably valve seals and quoted silly money to investigate. When I ordered the pipe from part department they couldn't confirm if it was for my car so had no return rights. However, it fit perfectly and was the recall version part in the USA

One thing worth mentioning is you may need the indy order the part as they sometimes don't like fitted supplied parts. Hopefully a clued up indy will be aware of the issue.

I took the risk of not replacing the turbo as I read they were pretty reliable up to 200k, plus I was willing to do the job twice it didn't fix it. The relief after waiting 3/4 days and finding no smoke was great.

Good luck, hopefully you can find somewhere that will do it. Failing that I'm sure a normal garage will do it. They'll need a gasket kit £25-40 (manifold graphite seals, o rings for coolant, gasket for drain pipe and one for turbo/cat.
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      05-12-2021, 04:49 PM   #27
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Is this check-valve hose fitted by default on later cars?
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      05-13-2021, 04:16 AM   #28
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Quote:
Originally Posted by 5mall5nail5 View Post
Is this check-valve hose fitted by default on later cars?
Not sure if it was default, but the US issued a recall on this pipe, but the UK didn't. Might be able to find some information online about it.
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      09-17-2021, 07:58 AM   #29
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@DG330, thanks for the detailed post. Very informative! My wife's X1 started doing this recently (startup only) car has 130km on it. I am thinking of changing the oil feed. Is there a chance it can be done without pulling the turbo off?
Thanks
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      09-17-2021, 10:16 AM   #30
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Quote:
Originally Posted by BKG View Post
@DG330, thanks for the detailed post. Very informative! My wife's X1 started doing this recently (startup only) car has 130km on it. I am thinking of changing the oil feed. Is there a chance it can be done without pulling the turbo off?
Thanks
Hi,

Nope, turbo needs to come out unfortunately as the bolt that hold the feed into the turbo is facing the block. So impossible to get to it.

You'll need a engine beam and a older tow bar key to screw into the block to support the engine when removing the engine mount. If not it will tip over to the side and be a pig to get back on its side.

If you're patient and have the right tools it's an alright job.
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      09-17-2021, 02:36 PM   #31
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Quote:
Originally Posted by davethefish View Post
they are now charging me for a work relating to draining water from an exhaust back box that i DID NOT agree to!
Try pulling that stunt in the US and you'll have lawyers beating on your door looking to sue him out of business.
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      09-17-2021, 10:30 PM   #32
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@DG330 thanks! Will pull turbo off then.
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      09-21-2021, 02:00 PM   #33
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Quote:
Originally Posted by DG330 View Post
Part number is 11428678840

Will fit in a couple of weeks when covid permits
I have no blue smoke but should i still change the oil line for preventive purposes to 11428678840 ?
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      09-22-2021, 01:34 PM   #34
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Have you seen how difficult it is to replace the thing? Not really something you do for ‘only’ preventive purposes.
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      09-30-2021, 12:18 PM   #35
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Yeah I wouldn't bother until it smokes. Just catch it early and you'll be fine to just do the pipe.

Also, this only affects cars up to when the recall part was issued. Eventually BMW built with the upgrade, so not an issue beyond a certain year.

It's always the way that the early years are plagued with issues, which I own haha. 2 timing chain replacements in 100k miles and the turbo oil feed pipe
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