Hi,
My VS Calais doesn't really start the best, and idling can be a bit lumpy at times. All plugs/leads etc are fine. However when I turn the ignition to on the IAC valve makes a noise - obviously going up and down. I've never heard it before on any VS. I've cleaned the IAC and throttle body and it idles noticably better than before but still not the best.
Do these commonly play up or could it just be out of adjustment? To me it seems like the IAC valve its doing a self test before the engine starts, either that or its locating itself to where it thinks it should go but obviously isnt right.
Also when I turn the car to On it doesnt make any fuel pump noise. In my VP and all other petrol cars I've driven the fuel pump sound is always there for the first 2-3 seconds when switched to on. Could a faulty fuel pump increase fuel consumption?
My VS Calais doesn't really start the best, and idling can be a bit lumpy at times. All plugs/leads etc are fine. However when I turn the ignition to on the IAC valve makes a noise - obviously going up and down. I've never heard it before on any VS. I've cleaned the IAC and throttle body and it idles noticably better than before but still not the best.
Do these commonly play up or could it just be out of adjustment? To me it seems like the IAC valve its doing a self test before the engine starts, either that or its locating itself to where it thinks it should go but obviously isnt right.
Also when I turn the car to On it doesnt make any fuel pump noise. In my VP and all other petrol cars I've driven the fuel pump sound is always there for the first 2-3 seconds when switched to on. Could a faulty fuel pump increase fuel consumption?