I've started my S5 T2 set up yesterday . It started up really well , idled at 1800 rpm with 12-12.5 A/F ratio . But after around 10 sec , engine cut and falls to 1000rpm and seems from the tests I've made that the Ecu stops trigering the front primary injector , so it runs only on the rear rotor .If I put switch to off and restart , same thing , 10sec then boom . If anyone has an idea of what that could be ...

I think it's possibly falling into limp mode but I don't know what's the symtoms when it falls into this mode .

Thanks Everyone !

 

what effing switch are you talking about?

dont you know how to diagnose a problem?

 

The ignition switch ,thanks for the help .....

 

1800 is a HIGH idle... 1000 is still slightly higher than normal. have you driven it? or you just think that because your idle dropped its broken?

 

it revs at 1800 when it starts cold then for some reason , ecu stops trigering the primary injector on the front rotor .... I have a code 3 (crank angle sensor G signal) but all resistance are good and wiring between ecu and CAS is OK . I've tried a diferrent CAS and ECU but still no difference .

 

and you know its cutting fuel to the front rotor how? cuz fuel cut goes to the rear rotor...

 

because I've put a led test light on the primary injectors pin out on ECU and the light green , wich is the front primary injector . I've managed to get the idle running today by adjusting the TB but I still get that missfire when hold throtle steady at like 10-15 % and rpm bouces up and down at the same time .

 

you are testing it wrong. you measure the resistance between the pins of the injector.