The stepper motor controls the amount of air entering the engine at tickover by moving the valve closer or further away from the valve seat in the plenum chamber.
The stepper motor should be cleaned from time to time to remove deposits that build up, it is these deposits that can affect the idling.
Dificulty Level: Easy
Time to complete: 30-45mins
Stepper Motor Position |
First remove the electrical connector, the Stepper Motor can then be unscrewed with the aid of a large adjustable spanner. |
This is what the stepper motor looked like before cleaning, not sure if this has ever been cleaned judging by the amount of deposits on the valve. |
Another view of the stepper motor before cleaning |
The stepper motor after cleaning |
Close up of the stepper motor after cleaning |
The housing is a bit more difficult to clean, I used a rag moistened with petrol, make sure no bits of rag are left in the hole. The stepper motor assembly can then be screwed back into the plenum and the electrical connector refitted. |