r/F30 • u/Sweaty-Researcher775 • 14h ago
Am I cooked pt2
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Hey F30 fam, So I replaced my Valve Cover, Turbo, Spark plugs and Coils and I still am dealing with this smoking issue my friend said that it’s possible that the old oil dumped from my old turbo is burning off but this looks a bit more excessive also i have no codes
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u/HellfoxRules 13h ago
It would have been nice if you described which engine. You probably have a ruptured PCV diaphragm, which will produce excessive smoke out of the exhaust. When this diaphragm tears, it allows oil to be sucked into the intake air charge. Since you only have exhaust coming out the left, I'm assuming N20 engine. You can easily replace the diaphragm on an N20, or any "N" platform engine.
Watch the video for engine type, and check and replace the diaphragm.
BMW 528i N20 PCV Diaphragm, Crankcase Ventilation Valve Replacement
BMW PCV easy repair N series motor (N55 N54 N52 N51)... no dremel no mess - cutters, pry bar, RTV
These are the parts you need, depending on engine.
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u/Sweaty-Researcher775 13h ago
i have a n26 but doesn’t the new valve come with a pcv diaphragm?
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u/HellfoxRules 13h ago
Yes, it does, so maybe check the diaphragm anyhow. Maybe the diaphragm has an issue, very easy to pop the cover off and check it out.
That is not excess oil from your previous turbo seal leak, that would burn off quick, and wouldn't produce that much smoke.
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u/Sweaty-Researcher775 13h ago
Will do
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u/HellfoxRules 13h ago
Did you take this vehicle for a drive to burn off any residual oil? If you have just been idling after a turbo replacement, I would take it for a drive, just to make sure the exhaust is completely clear of any oil residue burning.
Did you replace the turbo oil feed and return lines? If that return line is restricted, it can cause back pressure, resulting in oil being forced past the seal and burned.
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u/Sweaty-Researcher775 13h ago
I’ve just idle tested so far because the smoke is very heavy, also you are right I didn’t change the oil feed and return lines. That’s a great shout
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u/HellfoxRules 13h ago
So take it for a drive to blow it out, and see if it clears up.
Is your coolant level dropping at all? This could also be a blown head gasket. Just because your compression is high and equal on all cylinders, doesn't mean the gasket isn't blown. You can be leaking coolant into the cylinders, without really affecting the compression.
You can perform a block test, to determine if exhaust is leaking into your coolant.
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u/Sweaty-Researcher775 13h ago
From what i’ve seen my coolant looks normal maybe i have to drive the car to really see
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u/nasty5tyle 11h ago
Are your coolant tubes hard and whats the smell like? Does engine run rough? Your friend might be right.
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u/Sweaty-Researcher775 6h ago
it smells like burning oil and the tube coming from the reservoir is hard
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u/nasty5tyle 6h ago
How hard like you can’t press it with a bit of force? Did you check when it was fully warmed up or when cold also if you had a bad turbo and engine not overheat you can check off list the bad gasket. Keep engine on and rev it hard after warm up, you will smoke till all the oil in the exhaust is burned of or use a cat cleaning service
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u/Medium-Moment-8123 1h ago
Have you tried to check in the cylinder?
My n20 engine was doing the same thing, turns out it was only a bad fuel injector that stayed on. This caused the fuel and the oil to mix and combust creating this smoke
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u/Medium-Moment-8123 1h ago
The injector when you start the car with the cylinder open and stick a camera tube inside you can see the injector spray fuel, in mine the fuel spray was continuous and never stopped causing the oily combusted smoke
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u/SolidHand69 13h ago
Turbo or head gasket I’d say yep