UPDATE: smoke when going from WOT to no throttle

[silviasgp06]

Had friend behind me the other day, says color was dark grey. richness? wideband doesnt seem to indicate this. and PFC injector duty cycle is 0% when you go to zero throttle during this event.

what color is synthetic oil when it burns. Im using amsoil 0w30

-thinking the turbo seals might be slowly getting bad. or valve cover PCV oil ventilation.-doing a leak down test as soon as I get time to do a little work.

just to restate the issue,this only happens after i run through the gears shifting at almost 7k and then lift off the throttle all the way and coast (in or out of that current gear) only happen right after that lift for a few seconds, and never any other time. It never smoke daily driving or on start up.

Also never happens if i do a quick acceleration to high RPM,( ie: getting on a freeway on ramp running through 1st 2nd and 3rd gear. but if i was to do that a few time the mysterious smoke shows up.)

please help, and if any of my descriptions is at all unclear please let me know.

----Daryl

[dwnshfter]

mine did that cause the brake booster was leaking into the intake. how are your brakes?

[silviasgp06]

you know what, now that i think about it that could be it. the smell doesn't smell like anything that would normally go wrong.(oil or coolant) and this morning my brake light came on for a few minutes. S14s have a brake level sensor right?(i don't remember there one ever being there) but yeah if, not my brakes have been a little different lately. plus it all makes sense.

definitely checking after class.