I have a problem with Renault Megan Most likely its something with the coil but its really weird.
When i turn on the car its fine i drive for about 20-40km and the car starts to lose power like a coil would malfunction but then after 20-40km more its back to normal I want to fix it but I don't know which coil is malfunction because some times it works and other does not.
I want to avoid paying the mechanic just to plug in his computer and check which coil is broken, also i think it won't show any errors.
I could fix it myself if the coil wast working all the time i would just change one coil and drive and see it its the one that cause this but i cant because its sometimes working sometimes not. The engine light doesn't light either when the problem is active.
Is there any way to check if a coil is broken/malfunctioned without the use of a computer?