Missing at idle on 172 cup

[MATTJ172]

i have a 172 cup with 36k on clock, at idle when the car is cold its almost like a slight misfire for the 1st mile or so then its ok,just wondered if anyone has any clues?
mods are k&n panel filter,powerflow decatted system and rs tuning remap.
cheers!

 

[Ollie82.]

They all do it. Its the engine management running on an open loop fuel setting as the emissions sensors don't work until things have warmed up so it doesn't know how to fuel itself.

After a few minutes it switches to a closed loop and runs as it should.

 

[daviebroon]

typical problem with ph2's... most common with the 1.2's

if it's still under warranty reno will remap free of charge as it was on their recall list

my ex gf's extreme was sorted beautifully by reno with the same problem

 

[edde]

Sounds just like the cold running part of the ECU mapping come into play. I woulnd't worry.

Best PM the mapper see if they remove it. Otherwsie check the plugs and coil packs.