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?
Catless Downpipes Smoke Frequency
- Thread starter dash90
- Start date
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.
SHOdded said:
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
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.
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.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?
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
New member
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?
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?
