Odd smoke - Subaru Outback - Subaru Outback Forums
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post #1 of 17 (permalink) Old 05-15-2019, 03:06 PM Thread Starter
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Odd smoke

2016 2.5 limited with 57k miles. Just had service done at 55k. This morning got a puff of grey smoke out the exhaust. Not condensation smoke. Smells like exhaust. Goes away immediately. This is probably the 4 time this has happened this year. 2nd time in a little over a month. Car acts fine, still gets around 540 miles per tank. No hesitation. First thought overfill of oil. Checked it and itís just below top circle. Coolant was way above the full line. For some reason subaru decided to refill coolant a lot. I removed some today back down to just below full line when cold. It only seems to do it after car has sat and is a cold start. Never does it when itís been driven all day. No smoke while driving. Have not noticed and oil consumption. Check oil regularly with no loss. Iím stumped. Any ideas why I get this puff of smoke every once in a while.

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post #2 of 17 (permalink) Old 05-15-2019, 03:14 PM
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Is it a bluish or dark grey (black) smoke?
I assume it's not white, as you said it's not condensation smoke.

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post #3 of 17 (permalink) Old 05-15-2019, 03:22 PM
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when there's any odd thing with the car - always check coolant by looking in the radiator, you can't trust the line on the overflow bottle to always accurately reflect actual coolant volume.

any extra cranking time required to start the car?

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post #4 of 17 (permalink) Old 05-15-2019, 03:33 PM Thread Starter
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Ivytech- smoke was grey. Not too dark and dissipated right away. It’s a short burst of smoke.

1 lucky Texan- no extra crank time at all.
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post #5 of 17 (permalink) Old 05-15-2019, 04:13 PM
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only does it after sitting for hours? has it done it after a very short time stopped?

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post #6 of 17 (permalink) Old 05-15-2019, 04:17 PM Thread Starter
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Sorry unsure. The only times I’ve seen it was after it has sat a long time.
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post #7 of 17 (permalink) Old 05-15-2019, 06:09 PM
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I wouldn't be too concerned, if it happens only when starting cold, probably just some residual fluids burning in the exhaust system, while catalytic converter is still cold.

During cold starts, engine emits far more particulate matter and pollutants than when warm, because a cold catalytic converter is much less efficient until it warms up.
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post #8 of 17 (permalink) Old 05-15-2019, 06:18 PM Thread Starter
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Thanks
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post #9 of 17 (permalink) Old 05-15-2019, 07:30 PM
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is the car new to you? Or, is this a new issue with your one-owner car?

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post #10 of 17 (permalink) Old 05-15-2019, 08:56 PM Thread Starter
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I bought it brand new. Never had an issue with it. Not sure if I am able to do this. Admins if I can’t please delete this and I’m sorry. Here is what I’m referring to. This is not my car though. Mine is doing the same as this. See. Puff of smoke and gone. Only does this every once in a while.



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