[Collidal]

My '16 340i had a turbo leak issue when I purchased it, so I ended up replacing the turbo with the DAW flow max + one. Before the replacement, the car would smoke quite a bit when started up and even more at idle. There was oil getting to the exhaust as well. BMW was the one that diagnosed the issue and recommended replacing the turbo. Now, after it has been replaced, the car is still smoking about the same amount of smoke even after letting it idle for 20 mins. BMW suggested driving the car for 20-50 miles to "burn up all the remaining oil that leaked originally." Does anyone happen to have any suggestions? I checked the PCV and it did not seem to be the reason behind the issue.

[weehe126]

Well seeing as you bought a DAW turbo for some reason id give it a 50/50 chance it's still the turbo. But burning off residual oil does take time especially if it got into the muffler.

[Collidal]

Originally Posted by weehe126

Well seeing as you bought a DAW turbo for some reason id give it a 50/50 chance it's still the turbo. But burning off residual oil does take time especially if it got into the muffler.

It was the only option sadly, pure has a wait time of 2 months and I was hoping to get the car in working condition asap. BMW suggested driving the car for about 20 to even 50 miles. But I'm not sure how I'd do that with clouds of smoke behind me. Also, is letting it idle for a bit after it warmed up still not enough to burn the excess oil in the exhaust?

[blacksapphire440i]

Originally Posted by weehe126

Well seeing as you bought a DAW turbo for some reason id give it a 50/50 chance it's still the turbo. But burning off residual oil does take time especially if it got into the muffler.

Is the DAW turbo worst than the other options out there? Are Pure800s better or worst?

[weehe126]

DAW is sketchy china turbo. Look them up for N54. Im personally a fan of Pure as I had one in my last car.

Yes, drive 20 miles and see. Idle probably won't do enough.

[kianf22]

Originally Posted by Collidal

My '16 340i had a turbo leak issue when I purchased it, so I ended up replacing the turbo with the DAW flow max + one. Before the replacement, the car would smoke quite a bit when started up and even more at idle. There was oil getting to the exhaust as well. BMW was the one that diagnosed the issue and recommended replacing the turbo. Now, after it has been replaced, the car is still smoking about the same amount of smoke even after letting it idle for 20 mins. BMW suggested driving the car for 20-50 miles to "burn up all the remaining oil that leaked originally." Does anyone happen to have any suggestions? I checked the PCV and it did not seem to be the reason behind the issue.

Are you sure it's not your pcv ? Have u checked the diaphragm?

[Collidal]

Originally Posted by kianf22

Are you sure it's not your pcv ? Have u checked the diaphragm?

Yeah, that was the first thing I checked, sadly it's not that simple in my case.

[kianf22]

Originally Posted by Collidal

Yeah, that was the first thing I checked, sadly it's not that simple in my case.

Damn sorry man. : Is the turbo only leaking the exhuast side? Maybe your chargepipe and intake has a bunch of oil in it too. It would be very very unlucky if your replacement DAW turbo also had the same problem so check everything else first!

[kern417]

It can take a while to burn off. I had smoke under the hood as well for a little while, but after a few days it went away.

What color is the smoke? Have you checked plugs? If one is wet then it could also be an injector.

[Collidal]

Originally Posted by kern417

It can take a while to burn off. I had smoke under the hood as well for a little while, but after a few days it went away.

What color is the smoke? Have you checked plugs? If one is wet then it could also be an injector.

The smoke is white. I was driving the car around for a bit but the smoke got really bad and I ended up stopping. It kinda dies down for a bit and then a lot comes out. The car was also misfiring towards the end of the drive before I stopped. When the new spark plug was taken out, it came out smoking and was a bit black, but was not wet.

[nadefade]

Did they do a compression test during the diagnosis?

[Collidal]

Originally Posted by nadefade

Did they do a compression test during the diagnosis?

I don't believe they did. They seemed confident that it was the turbo though, but now it doesn't look like it at all.

[Info@mad-us.com]

Probably just oil in the exhaust or cats . Takes time to burn off.

[Collidal]

Originally Posted by Info@mad-us.com

Probably just oil in the exhaust or cats . Takes time to burn off.

If that is the case shouldn't the amount of smoke coming out be consistent after the car warms up? In my case a little smoke comes out, then a very large amount and it goes on like that. It was so much smoke that it basically covered most of the street. Also, the turbo was replaced, so the down pipes were off and didn't have much oil in them after they put them back on. I'm having the dealer check it tomorrow.

[weehe126]

If it's not the pcv then might be a bad ring letting oil past. Assuming it's not the new turbo. Did you figure out what cause the stock turbo to go? Clogged oil feed/drain tubes to the turbo can also cause oil to het pushed past the seal.

[Info@mad-us.com]

Originally Posted by Collidal

If that is the case shouldn't the amount of smoke coming out be consistent after the car warms up? In my case a little smoke comes out, then a very large amount and it goes on like that. It was so much smoke that it basically covered most of the street. Also, the turbo was replaced, so the down pipes were off and didn't have much oil in them after they put them back on. I'm having the dealer check it tomorrow.

Well as it gets hotter the amount of oil that burns is greater. It can smoke heavily for awhile depending on how much oil was in the exhaust. If it doesn't lessen after 15-30 minutes i'd say you have bigger issues.

[nadefade]

Originally Posted by Collidal

If that is the case shouldn't the amount of smoke coming out be consistent after the car warms up? In my case a little smoke comes out, then a very large amount and it goes on like that. It was so much smoke that it basically covered most of the street. Also, the turbo was replaced, so the down pipes were off and didn't have much oil in them after they put them back on. I'm having the dealer check it tomorrow.

Any update?

[Collidal]

Originally Posted by nadefade

Any update?

I should be bearding back today from them about it.

[Collidal]

Originally Posted by nadefade

Any update?

Alright, so I heard back from them but I really doubt what they suggested will do much for me. They basically said there's a little oil leaking from the timing chain tensioner and that it needed to be replaced in addition to fixing a little hole in the exhaust pipe...hopefully, they'll run some actual tests or something tomorrow.

[weehe126]

That would be a very abnormal leak. Sure it's not leaking down from the valve cover? A little hole in the exhaust pipe also sounds odd and wouldn't cause smoke.

[nadefade]

Did you have a chance to scan the car for codes? Did it go into limp mode?

Edit: Their findings seems strange to me as well. My bet would have been on the PVC, turbo seal, or ringland as stated above.

[_N54]

Check for scored cylinder walls.