Originally Posted by
seve170
hi my st170 judders in between 1000rpm to 2000rpm and when over 4000rpm it seems to lose power and won't rev rite up have already changed the fuel rail,fuel filter.crank sensor,air flow mass metre,plugs and yesterday the coil pack but still the same so i,m ready to crack up! anybody with any ideas would be much appreciated
that sounds like the imrc, look on the end of the inlet manifold and you will see a cable , there is a black plastic thing there, they are prone to wear and breaking etc,
the imrc is the inlet manifold runner controller, the is a solenoid on the bulk head which controls it all. its what gives the nice surge of power at 4000 rpm