rough idleing

[w_parker]

Hi guys, Not owned the evo long. An issue which is really bugging me is the rough idle. What will cause this. Its had a new ( well second hand ) maf, i changed all the plugs to iridiums 8's, oil & filter change and she still doing it. Why is this? The hight temp exhaust light is on due to a decat on it...could this be the reason???? Thanks, Will

 

[RsvRob]

What model evo would help as would a newbie post?

Battery been disconnected? Meens idle reset required.

Disconnect battery for minute.
Reconnect battery and start.
Run for 10 min without any electrics on at all.
Contiue running with electrics on (heater, radio, lights, everything).
Take for drive about 10-15 min to settle fuel trims.

 

[w_parker]

sorry for nto saying hello was going to do it all when i put the pics up of the car. Its an evo 4 lancer gsr that i have. I will try the battery reset. Thanks

 

[w_parker]

right then peeps, I did the above and it still has rough ldle. I even left the battery disconnected with all electrics on so the ecu was drained, but as said, still rough. Could it be the HKS bov???

 

[RsvRob]

May need full reset with use of Evoscan !!

or

You may have an air leak somewhere !!

 

[w_parker]

ok thanks, Just bought a full intercooler and kit so hopefully that may eliminate it, Just put all new vacuum hoses (in white ) on it. Fingers crossed