Hi guys.
How do i adjust the mixture?
The MOT station said it was very weak
M40 engine.
M40 mixture adjustment?
Moderator: martauto
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Brianmoooore
- E30 Zone Team Member
- Posts: 49360
- Joined: Mon Jan 10, 2005 11:00 pm
Mixture is controlled by the map in the ECU and is non adjustable.
I expect your MOT man is referring to the idle CO adjustment.
This is adjusted by a screw near the engine end of the airflow meter, which may have a red plastic plug covering it.
It works by adjusting the amount of air that bypasses the flap in the air flow meter, thus fooling the ECU as to the amount of air entering the engine at idle.
It can only be adjusted properly by attaching a gas analyser to the exhaust pipe.
I expect your MOT man is referring to the idle CO adjustment.
This is adjusted by a screw near the engine end of the airflow meter, which may have a red plastic plug covering it.
It works by adjusting the amount of air that bypasses the flap in the air flow meter, thus fooling the ECU as to the amount of air entering the engine at idle.
It can only be adjusted properly by attaching a gas analyser to the exhaust pipe.