Stock Opel C20LET engine 4cyl (year ?),

Stock injectors

New intake air and coolant sensor installed

New engine harness

Coil on plug (4 VAG active cop)


Should be easy setup (make sure grounds are connected properly)



Sick in multiple ways:

Do we wonder that removing pullup does NOT help ?

Trigger types from best to worst:

High RPM

There are trigger error and missfire on higher RPM.

Common causes:

Although unlikely to be of issue, a simple test (to see that internal 5V1 zener "voltage limiting" is functional):