Hi it's me again thanks for all your replies before but this is a major issue for me basically the car is still doing it won't rev past 3k and just back fires all the time in every gear the hotter the car gets the worse it gets I have a turbo fan switch I switched it on and it don't seem to be doing it but surely it can't stay on for the whole drive ? Can some please help me it is really bothering me oh the car is focus rs mk1 . I have tuned boost down and bought a new actuator spring I was going to get it mapped again maybe it could be that ?

Thanks Luke

 

is the catalyst in good condition? if its blocked excaust fumes cant escape so the car cant rev at least in older cars with ceramic catalyzator

 

its got a Decat and full system mate

 

hi mate
did you change the plugs the last time you asked this question??

 

no mate im going to service this weekend and go from there i think. Thanks again anyway

luke

 

you have to check your ignition mate.plugs...and leads..and coil pack..aaaand i think i remember you saying you did check the plug for the maf sensor..

plugs you should change anyways...and measure the leads and coilpack.

 

what plugs do you recommend whats the best ones ?

 

hey mate

i do not run a highly modified car..just a bluefin..and decat and stuff..and i run the standard ford plugs that ford sell to the Focus rs

and they work brilliantly for me

 

Are you running an induction kit or standard air box.
I had a bit of a niggle with mine there and it was the intake hose to the air box had collapsed and was sucking itself closed when accelerating. Worth a wee check you can see it through the nearside vent in the bumper

 

these are what i got in mine and running 350
NGK LASER PLATINUM preminm