idle problem in the morning

[westly7]

engine sr20 blacktop s13 stock.
i try to start it starts smoothly but i figured light black smoke comes from my muffler,then when im boosting and rpm wont go higher from 3500-4000 and starts to bogging and acting funny.
and when on traffic light i push clutch all way in the idle went very low almost stalling
i havent check anything bc too busy work but im assuming my maf sensor is the problem bc i just cleaned it with maf cleaner from autozone.
and my car gets sucky mpg about 16 mpg..is that normal for stock sr??
i did search but im not sure about bumping old thread or open this one so please leave neg comment behind.any help would appreciated guys

[S13RB25DETDRIFTER]

check you MAF like u said also check your O2 sensor and Air Idle Control Valve but im pretty sure its ur maf i had this problem on my Rb

[westly7]

and how do i know if maf is the problem? bc i dont have spare maf

[S13RB25DETDRIFTER]

you cant really check for MAf use a 300zx MAf i have one sitting on my desk that i dont use with pigtail

[chucky norris]

i had almost the same problem besides the smog
i had crap mpg to
Spencer (sideways performance) fixed it all he did was mess with the timing and the idle control crap and that was it

i hope u fix it soon =D

[KA(ALLTHEWAY)]

it could be your maf which could cause the black smoke if the maf wasnt reading right causing it to send higher voltage to the pcm. so your pcm would think your getting a lot more air then you really are causing your injectors to stay on longer and your car would run richer which would cause the black smoke. you would think your o2 would catch it. does this only happen during warm up and goes away when the engine is at operating tempature

[KA(ALLTHEWAY)]

oh and that would also cause cruddy gas mileage

[westly7]

i finally replace the maf and rewire pigtail and i think maf doesnt have enough ground (i assumed) but after i rewire and clean the filter also it runs good now but still got around 17 mpg or so.almost buy new o2 sensor but didnt