BMW e91 318i 2006 smoking

Epokepok e91 · 01-30-2022, 01:36 PM

I have a Bmw e91 318i 2006 that is smoking alot when idle. It smells burnt and can sometimes look blue.

Things that I have confirmed:
CCV system is changed and good
Valve stem seals good
Head gasket is good
Valve cover new with new gasket good

Things that I have problem with:
MAF sensor is not working
All lambda/o2 sensors showing fault codes

I have never lost any oil as the electric oil level sensor is showing max.

Fault codes:
002CA3
002CA2

F31B48 · 01-31-2022, 01:36 AM

These engines are notorious for worn valve stem seals causing blue smoke from the exhaust. How do you know the valve stem seals are good?

nuke21 · 01-31-2022, 03:42 AM

where is it smoking from? the exhaust or under the hood. I had a "new" valve cover gasket but noticed smoke at idle at a stop light coming from under hood. after better inspection I noticed the rear bolts on the valve cover were not tight so I torqued it and it went away. Scared me and my date at the stop light seeing this though. Stunk too.

Camery · 01-31-2022, 11:00 AM

My car had the same issue, N46 318i.
Idle the car for a few minutes and then step on the gas (in neutral) somewhat hard.
If there is blue smoke coming from the exhaust it is 95% valve stem seals and/or piston oil scraper rings.

I agree with the above, how can you be sure the valve stems seals are good?
I don't think a defect could be seen by eye, oil seeps trough the smallest of gaps.

My car had both possible suspects replaced and I am now blue smoke free.

01-30-2022, 01:36 PM	#1
Epokepok e91 Registered 0 Rep 1 Posts Drives: Bmw e91 318i 2006 Join Date: Jan 2022 Location: Norway iTrader: (0)	BMW e91 318i 2006 smoking I have a Bmw e91 318i 2006 that is smoking alot when idle. It smells burnt and can sometimes look blue. Things that I have confirmed: CCV system is changed and good Valve stem seals good Head gasket is good Valve cover new with new gasket good Things that I have problem with: MAF sensor is not working All lambda/o2 sensors showing fault codes I have never lost any oil as the electric oil level sensor is showing max. Fault codes: 002CA3 002CA2
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01-31-2022, 01:36 AM	#2
F31B48 Captain 278 Rep 657 Posts Drives: BMW G21 E61 LCI Join Date: Feb 2019 Location: Australia iTrader: (0)	These engines are notorious for worn valve stem seals causing blue smoke from the exhaust. How do you know the valve stem seals are good?
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01-31-2022, 03:42 AM	#3
nuke21 Private 17 Rep 65 Posts Drives: 09 328i Join Date: Feb 2019 Location: Boise, Idaho iTrader: (0)	where is it smoking from? the exhaust or under the hood. I had a "new" valve cover gasket but noticed smoke at idle at a stop light coming from under hood. after better inspection I noticed the rear bolts on the valve cover were not tight so I torqued it and it went away. Scared me and my date at the stop light seeing this though. Stunk too. __________________ 2009 328i
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01-31-2022, 11:00 AM	#4
Camery Private 20 Rep 65 Posts Drives: 2007 E90 318i Join Date: Apr 2018 Location: Netherlands iTrader: (0) Garage List 2007 BMW e90 [0.00]	My car had the same issue, N46 318i. Idle the car for a few minutes and then step on the gas (in neutral) somewhat hard. If there is blue smoke coming from the exhaust it is 95% valve stem seals and/or piston oil scraper rings. I agree with the above, how can you be sure the valve stems seals are good? I don't think a defect could be seen by eye, oil seeps trough the smallest of gaps. My car had both possible suspects replaced and I am now blue smoke free.
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