Catless Downpipes Smoke Frequency

[dash90]

Hey guys so I have the LME catless downpipes in and have been in for months and I love them. Its been my favorite mod besides tune. Sometimes the exhaust will release some smoke from a tad bit to clouds and at first I was like uh oh but I have come to love that too lol. Just wondering if anyone knows what causes the exhaust to SOMETIMES smoke out and most other times none?

[SHOdded]

Can you remember if more appeared after the car has been sitting for a while, for example?

[14SHOCAR]

At one point in time, I recall following a SHO (before I owned one), that had the same thing. It appeared and sounded bone stock. Who knows what exactly that is, but I believe it happens on the stock vehicles too.

[ZSHO]

From my understanding to alleviate any white smoke during morning startups only if they fail to let their turbo cool/spin down before shutdown the night before,try letting the engine idle a minute or two before shutoff,also condesation retains inside the mufflers and causes the white smoke effect,and you can also check your mufflers for any buildup through the little peep holes under the muffler bu using a small screwdriver to check to see if its clogged up.Z.

[dash90]

Can you remember if more appeared after the car has been sitting for a while, for example?

I've been trying to find a routine in how I drive and when it smokes but I cant really say I have found one. Sometimes after I speed and when im at idle it will do it and there have been times when I have not driven it but after its been sitting on idle for a while it will do it. Completely random. And when I say clouds I mean pretty thick and stinky

[dash90]

At one point in time, I recall following a SHO (before I owned one), that had the same thing. It appeared and sounded bone stock. Who knows what exactly that is, but I believe it happens on the stock vehicles too.

Hmm never happened with me when it was stock

[dash90]

From my understanding to alleviate any white smoke during morning startups only if they fail to let their turbo cool/spin down before shutdown the night before,try letting the engine idle a minute or two before shutoff,also condesation retains inside the mufflers and causes the white smoke effect,and you can also check your mufflers for any buildup through the little peep holes under the muffler bu using a small screwdriver to check to see if its clogged up.Z.

Oh yah I let my car run at idle for a few minutes before shut off and much longer on start up. I would say condensation makes sense.

[SHOdded]

Well you know where to start   Look at the intake tube for oil drops/pools, look in the intercooler for crud accumulation as well.  If you find either or both, then you likely have a PCV issue, which MAY be resolved with the TSB out on it.  Otherwise, it'd more likely be turbo seals going south.

[ZSHO]

From my understanding to alleviate any white smoke during morning startups only if they fail to let their turbo cool/spin down before shutdown the night before,try letting the engine idle a minute or two before shutoff,also condesation retains inside the mufflers and causes the white smoke effect,and you can also check your mufflers for any buildup through the little peep holes under the muffler bu using a small screwdriver to check to see if its clogged up.Z.

Oh yah I let my car run at idle for a few minutes before shut off and much longer on start up. I would say condensation makes sense.

In colder weather there is more increase in condesation buildup,as to compared to warmer weather where there is less,and based on your 6 month setup which seems cold.

[AJP turbo]

Do u have an after market cat back?

[14SHOCAR]

I just read the forum post here: http://www.ecoboostperformanceforum.com/index.php/topic,500.0.html

In summary:
White smoke = Coolant is getting into your cylinder. This could mean cracked block or bad seals.
White smoke + oil smell = could be any of the above or it could be your Turbo seals (if you had them rebuilt, it would lead to this).
Black smoke = running too rich.

My two cents here is if its intermittent, at random times, it sounds like when your t-stat circulates new coolant it is somehow leaking into your cylinders. Have you checked your coolant levels? have you had to fill up?

[IHeartGroceries]

Two things come to mind, factoring in the smoke's intermittency - EGR circuit and PCV circuit. You can rule the EGR out, if smoking at idle. Assuming it is functioning correctly. Any smoking under heavy load, that isn't black (fuel in excess)?
Almost certainly the smoking isn't a new occurrence. The cats were simply masking it.

What type of engine oil are you using? What change interval?