My fd smokes for about 2 minuts on cold days.only sits overnight i drive it every day. Smoke looks blue. Curently have 10w30 synthetic in it. I see a lot of ppl use 20w50. Has no OMP (premix with idemitsu) . Could it be worn turbo bearings leaking oil into the exhaust? Rebuilt the engine myself about 1,500 miles ago. And had housings lapped at mazdatrix.

 

Not a builder, but I think blue smoke that goes away pretty quick on cold start is usually attributed oil control rings.

 

I thought it was sticky side seals or corner seals

But i'm not a builder either

 

Im no expert, but as Sgtblue stated, blue smoke is attributed by an oil leak in your engine or turbos. If it goes away upon warming up then i would presume a seal is a bit leaky causing oil to "puddle" in the bottom of the housing, only to be burn away upon start-up.

 

Again, I think that would manifest low compression, (accelerated) fuel dilution of oil and hard hot starting.

 

 

Forgive the double post and quoting myself. Forum apparently is having issues. Initial edit comes out as a quote and then no doesn't allow further editing. Weird.

 

my car did that too, i thought it was normal

 

Had the same problem aswell

 

I've heard it's fairly normal especially if the engine is getting "tired"... As I understand it it's nothing to worry about as long as it goes away once it warms up.

 

i might have gone along with leaky oil seals, but with the recent rebuild, i don't know.

did you use all new seals and bearings? if so, it could be the seals settling - maybe allowing some overnight leakage. it may also have done you some good to use mineral-based oil up to this point and then switch to your synthetic when the engine was done with break-in.

have you had to add any oil in the 1500 miles?

 

might be your metering pump injecting to much oil

 

... also, it probably wouldn't only smoke for the first 2 minutes after cold startup if it were the MOP.

 

Not sure, but I could see it possibly doing that until the cat heated up.

 

Problem solved. Picked up an adaptronic ecu as part of my build and my tunner just messed with the timming and it hasn't smoked since. So all the smoke was real bad combustion. Im thinking it had a lot to with the bigger port job also

 

So can we assume it wasn't really blue smoke all along? Seems like tuning would do little for blue smoke during cold start.

 

Yeah it was all bad combustion gases. My oil level never changed so i was kinda stumped before. And i wasn't losing coolant either. But didnt think the running rich issue could cause so much smoke on warm up.

 

Damn I'm running rich and have the same symptoms... Should just have the tune tweaked?