Can anyone point me in the right direction my 4x4 Saph Cossie, Revs by it's self on idle. Normally upto about 4500rpm then dies back down and idles nicely , it mainly does it when cold but occasionally while warm, is really annoyiny can Ne body help......
cheeRS..

 

Easiest option is to take it to a good cosworth tuner m8
Get it on the diagnostics and good set-up/tune

 

it can e a few things first your tps could be playing up second could be you idel control valve iscv it can be the litel blue sensor at tyhe back of the head that controls the idel iscv and the fueling first un plug the tps and see if it still does it not then change that if it make s no differnce then change the blue sensor at the back off head but un plug the iscv first that might be no good now

 

iscv? tps ?

 

oh and i forgot to mention it does'nt do it all the time..

 

iscv...idle speed control valve
tps ....throttle position sensor

 

CheeRS m8.