The mixture is too rich.
I dont think so...
On the inspection it passed with 2.50 CO... normal since by portuguese law it can be up to 3.5. And a lot of years ago the car was out of tune and failed the inspection with 7 of CO and driving it you wouldnīt notice anything wrong.
By the way check the pic I attach of the spark plugs I removed from the engine when I replaced last week.
It could be wiring fault between the blue temperature sender and the ECU connector,
Dont think so.
The sender is connected to the main wiring by a small cable.
Today I took the car to my job and when I arrived with the engine running I disconnected the main wiring from the small cable (that is connected to the sender) and the engine started to strugle, rpm going up and down... I reconnected it and it idled normal. The same thing happends when I disconnect the Idle speed actuator.
or incorrect setting of the AirFlow Meter CO screw
Dont think so...
As I said it passed inspection with 2,5 CO... and the voltage on pin 1 of the AFM was set by me to 2.00 volts
incorrect setting of the AFM flap spring preload, defefective AFM,
That I dont know...
The AFM is not the original and was replaced with a new unit (same model) and when I broke the engine it was working fine. I has about 20.000Km from new.
It was never touched inside... never opened.
That I also dont know... but check the pic I attached.
or wear of the camshaft lobes.
The engine was repaired and I did max 500Km from repair.
All camshafts were perfect.
Today before starting the car to came to my job I turned the AFM screw clockwise (to close gas) and noticed the performance of the car was cut. The car doesnt pull the same way (normal) but when it reached full temp, the pinking was there... maybe a little bit less but stiil there, and the idle speed doing the same, difficult to be down from 1000 rpm.
Edit: my car is non cat version.