Golf VI R :: Smoke From Exhaust On Cold Start


Apr 26, 2016

At cold start (car sitting at least 8 hours), and the first block or so of driving, I have been getting smoke from the exhaust. I am not 100% certain whether to describe it as black or blue. If I start and idle the car, the smoke continues until I start driving.

After warming the car up, I have tried letting the car sit and idle for an extended period (over 5 minutes), and the smoke does not reappear.

Background;

- APR Stage 3 car, 17,700 miles

- On a particularly cold night this winter, the BFI clean catch did freeze up, and the car started blowing smoke. I removed it for winter and re-installed recently.

- Oil change with Rotella T6 and Mann filter 700 miles ago; the level when warm is at Max level

During the winter, it is hard to say whether this issue was happening. I noticed the issue some time after changing the oil, so I am wondering if the oil level may be slightly high. I changed the oil around the time the weather started consistently staying above 40F, though, so it could be coincidence.

I tried to come up with what the cause could be. What I was thinking (in order of easy to difficult);

- It's normal! The weather is warm, and the fuel trims have not adjusted yet, so it's running rich at start-up.

- It's normal! Typical 2.0T stuff.

- It's a catch can problem. Troubleshoot by removing it and seeing if the smoking stops.

---> Catch can is NOT full. I check it at least once per week.

- It's a turbo problem. The catch can freezing overpressurized the turbo lines and blew a seal

---> Although my experience has been that idling the car should bring the smoke back in this case, which I haven't gotten it to do.

- It's an engine problem.

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Video 2, Friday after noon at 6p.m. ~50 degrees

Video 3, Next day 10 a.m. ~48 degrees

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But there does seem to be a bit of exhaust (puff....puff.....puff...) that seems to be coming from under the turbo side of the engine, but it is hard to tell.

Recently - over the last couple of weeks - noticed at start-up in morning, significant amounts of blue smoke from exhaust - eventually subsides to nothing after a couple of minutes. BUT, it only seems to appear when the car is angled with its nose slightly up in the driveway and not with its nose down. Lack of it occurring with its nose down was only tried twice; I may need to check it again.
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2) Oil getting into the combustion chamber via oil in the turbo system. Checked the low spot in the hose just before the throttle body. Seemed virtually dry; that's not the problem.

3) I guess it could still be oil gathering some place due to the failure of the turbo, but power seems quite normal.

4) Problem potentially with the PCV (actually called the breather and bleeder valves) and/or vacuum system being plugged up. After reading all of the posts regarding that I am starting to think (HOPE) that is it and not the turbo. While I do understand that flapper valves that are stuck would create greater pressure which could result in oil being forced into the chamber past the valve seats, I am not sure why the angle of the car while parked would matter since the higher pressure would only be occurring while driving; and the blue smoke goes away after driving and doesn't appear until next morning. But perhaps I am missing something.

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Only had happened a few times in the last month. I start the car and it idles okay. drive down the road and then come to s stop and there's some blue smoke. It smells like burning oil. it only has happens 2 times in the last 2 months. only when its really cold it has happend. If I rev it when its happening I can see a big plume of bluish smoke and it smells like burning oil. after i drive after that no more smoke.

car has 95k on it
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I get the truck tagged and start driving it on a daily basis. I've put several hundred miles on it but the more I drive it, the less it wants to start. Now it's to a point where it only cranks but won't start. I can take a gas rag and hold it in the intake and eventually it will start. Once it's running, it runs great and has no issues starting. But once it sets for 3-4 hours, it won't start without some sort of assistance.

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Two days ago, I was driving and about to hop on the highway to make my 40 minute commute home, realized that my temp had gone up about an eighth over 190 (usually stone cold centered)... Watched it for another 2 minutes and the temp was 3/4 of the way to the red, so I pulled over and popped the hood.

The coolant reservoir was COMPLETELY empty, which didn't really make any sense- I had been running my AC all day because it was hot out, but I don't think I was idling with the AC on for too long.

I let her cool off, had a friend bring me some coolant (not much at all) and a TON of water. Filled her up and went home; temp was trying to climb but I wouldn't accelerate too much so she wouldn't go much higher than that eighth over the 190 mark.

Next morning, dropped her off at a mechanic's before work, asked for an oil change, inspection, and to check out this temp issue. These guys told me that they ran a compression test and everything was okay, no leaks or cracks in any hoses so it is a faulty turbo. They also stated that in idle, there seems to be intermittent white smoke out of the exhaust- coolant burning, obviously).

Drove it from them to a spot nearby to let her cool off because I wanted to see if there was more white smoke.. Driving TO the location, I blew A LOT of white smoke on acceleration, I had the heat blasting the entire time so the temp didn't really rise too much.

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It runs and idles well but sometimes during acceleration it will start to flatten out and smoke out the exhaust. Giving more accelerator pedal powers through the flat spot and the truck runs smooth. It does not do it every time. It does it hot or cold, wet or dry, city or highway, If this was a gas engine I would be replacing the fuel pump or checking a fuel starvation issue but the white smoke tells me that it has unburned fuel.

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Before I take the car back in and have them start pulling my engine apart I thought I would get input. It only smokes when cold, and doesn't appear to smoke while driving. No performance issues at all - runs awesome. Fluid levels are fine. Smoke doesn't really have a strong odor or oil or glycol.

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