rough idle,but revs clean and pulls hard in boost

[mystacarlo]

its a 94 s14 Silvia.

Jus recently its started acting fruity, it idles very rough on idle, pretty much misfiring on idle and rpm under 2k, but once it gets past that, it revs clean and pulls hard in boost, a/f is constant 11.5-11.8 to redline.

Things i have checked.

compression 150 straight across the cylinders
ignitor
injectors to see if the seals were leaking
coils
maf

Any help?

[steve shadows]

What is the AFR at idle?

What EMS or ECU are you using?

What injectors are you using?

PM me if you want some quick support as well

[S14_Kouki]

yes sounds like a fuel problem at idle

[mystacarlo]

its around low 14's to high 13's which is off, the car normally idles leaner and smoother
stock ecu and stock injectors, stock fpr
safc2 to controll fuel

[steve shadows]

Sounds like your AFC settings for MAF are off and maybe your AFR is too rich as well.

I would aim for 15:1 for idle

[mystacarlo]

the settings on the safc have not changed, i have never touched the low throttle settings because i'm running stock injectors, only correction i have is on hi throttle, which like i said is fine cuz it revs and pulls hard in boost. No cel codes at all

i was jus told tonight, it maybe my coolant temp sensor for the ecu

[mystacarlo]

thanx guys for the input, it was one of my injectors failing, i have now swapped in some 550's, and its runnin smooth again.

[Ivebeenconverted]

get a grounding kit too!