hei guys

i need help! my car tends to spit black smoke when i decelerate. I'll be on WOT then when i let go the gas pedal, black smokes comes out. Its fine when i accelerate.
the car is catless and running straight pipe all the way.
the power feels good still.
could the TPS be the prob?

thanks guys

 

do me a favor and do compresson test on all cylinders, see what it is...

 

ummm...

the car runs momentarily rich when you get off the throttle because the air is cut off...sooooooo.....

black smoke

 

^+1 That is likely all you are seeing is a bit of excess fuel. I don't suppose you have a wideband, OP.

 

Dude, that should be normal for an evo.

 

haha i know u guys gonna say its normal but let me explain further.
the black smoke is not just a puff after letting off the throttle. its a good few secs of trailing smokes when im off the throttle.i feel like the throttle position is not properly close when im off the throttle. so its still feeding fuel when i decelerate. i have a video recording of it on a track. will upload to YouTube soon.

my A/F is roughly 11.8 then lower towards the end

 

+1
BLOW BY!
new rings/re-hone job!
might as well toss some forged pistons and rods while you got your motor apart.

if it is tuning,.. then you might want to find another tuner.

 

i really dont think is that. is just excess fuel. car power is still very good.
will upload the video tmrw.

 

here u go guys. watch the video. check out the black smoke when ever i released the throttle

http://www.youtube.com/watch?v=ZVYhXcrQg7U

tell me what u guys think the prob is