i bought a brand new mareli idle controle valve from a1 and it wauldnt work on my car i tried it on my mates car and it didnt work on that ether. his car had just had another l6 put in it because the old one wauldnt adjust on the fueling it was then set up on the new one . thats when we tried the idle valve on his car it didnt work so i put his own back on and it was perfect again . he drove it home it was still fine when he come back out to it it wauldnt start he tried putting the old l6 back on and it runs again .1 do you think the idle controle valve could have caused this .
2 do new idle valves have to be set up for the car or do thay just work straight from the box

 

the idle valve is infact a cold start valve and has no use once the engine has fully warmed up, as idle once warm, is controlled by the base idle screw under the throttle body.

did you buy the right valve as there are 2 - one with a diode and one without, not sure if they are interchangeable on L6 ecu's tho

 

different part no to the old one but my car still has the l1 and my mates has the l6and its from cold that it dosnt work from cold but its perfect when its warm

 

I thought they also controlled the idle speed to compensate for when there are large current draws like when the HRW, Lights etc are on. Without some sort of compensation, the idle would drop quite low.

 

it should mate but it isnt

 

so does anybody know if the ecu will be reading the fault code off the faulty icv? cos it was fine before jacko's dodgy one went in, never had any problems idling or running properly cant say im too impressed about it though cos its a nitemare to drive

 

sorry mate ill sort it though just need to get in touch with a1 . my black fiesta had same problem as the sierra and i bought a new icv and it was fine as for as i know it only has 2 wires so can only be a small amount of things that it could be