what type of motor is it? the quad 4 or the 2.2
A vacuum leak can cause that.
the idle speed air control controls the amount of air going in to the engine so it idles at a certain rpm so it wont stall when you stop at stop signs or so it wont over rev
check for holes in the casing around the engine that might be allowing water in the engine and flooding it.
Astra 1.7 cdti wont rev past 300 rpm
Rev. Paul Jones
If a Carina Turbo will turn over but will not idle there can be an air leak. The vacuum lines should be checked to see if there are any holes.
rev limiter
Rev. limiter?
The rev limiter makes it so it wont over rev and the bike doesent blow up
vacuum leak, bad idle control sensor
The engine has a rev limiter while the transmission is in neutral. It will rev to higher rpm's when the transmission is in gear.
If the vehicle is in neutral or park and it doesn't rev over half throttle, it is the rev limiter (governor). That is normal.