Date registered: Oct 2010
Mentioned: 0 Post(s)
Quoted: 9 Post(s)
Ok, itīs an easy one, itīs the cold air valve. This is how it works. The fuel system detects an increase of air going trough the system and sends more fuel but then detects that the throttle valve is not being actuated so it cuts the fuel being sent. this happens at aprox 2.000rpm
When the engine is surging down the system detects that the engine is going to stop so at about 750rpm sends a signal to the system to inject fuel.
The surge is between 750 and 2.000rpm. Thatīs beacuse the cold air start valve remains open. This valve actuates mechanically, itīs like a thermostat, remove it and cleanned internally, how to do it?
Remove the valve, on top of the engine, in front, it has 2 air hoses.
Boil water and introduce the valve, when hot (around 2 minutes in boiling water) the valve will close (in this case open). Pour inside a good degreaser, or even WD40, take the valve out and deep it in iced cold water. Repeat this 8-10 times.
How to know if it is fixed? After finishing the procedure and with the valve hot try to blow up air inside one of the wholes, no air should come on the other end.