I have a missed part in the distributor cap which is marked with the red circle, what is this part ? can it be a reason for a bad mileage ?
It's just plugged with a breather cap. Like this:
Always mention the car, model and engine in it for such questions.
Thanks for your answer, so do you think that it is not problem to leave it without this cap, my car is margalla 93 1.3L .
An elbow shape rubber tube facing its open end downwards will do the job. Leaving it open will allow water to get in.
Thanks for your help, will try to find a suitable rubber tube.