running kinda rough at idle

N

nike0406

Member
I have an s13 but it seems to run rich and spudder at idle, but revs just fine.theres a little flat spot right off of idle, but revs fine after that. Checked spark and all plugs are firing fine. what could it be? O yea its a ka dohc 93.
 
it was running great and then all of a sudden. I can tell its rich by the puffs of black smoke out the exhaust lol. theres no vacum leaks, and now its hard to even get started to even idle.
 
my guess is maf....there is a air fuel mixture screw somewhere in the back of the intake
my maf trips real time monitor at work but doesnt throw a code so i know my maf is faulty but my car does run real rich...plus my car when warm idles at either 1400 or about 1k on cold days (running rich)
 
NissanTech240 said:
my guess is maf....there is a air fuel mixture screw somewhere in the back of the intake
my maf trips real time monitor at work but doesnt throw a code so i know my maf is faulty but my car does run real rich...plus my car when warm idles at either 1400 or about 1k on cold days (running rich)
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change your CHTS (Cylinder head temp sensor) and see if it brings down the idle.

my S12 use to run LEAN as fuck on cold warm and spit and studder until i changed it then it idled perfectly.
 
well mine idles a little high because i have the throttle set a bit more

S12 Drifter said:
change your CHTS (Cylinder head temp sensor) and see if it brings down the idle.

my S12 use to run LEAN as fuck on cold warm and spit and studder until i changed it then it idled perfectly.
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nah my idle was because of an lower intake leak.
just fixed it today thought it was the upper but i resealed it and was wrong so i checked around the lower to find out it was it
 
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