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engine just working by 3 cylinder ?

Hi my opel zafira 1997 1.8 16 v some times working normally and often working by 3 cylinder. I Replace spark plug and a capacitor but without effect. Note : the problem in the same cylinder thank you very much and I'm so sorry for my spilling
faraj kandakji, June 2015
A compression test may be worth doing,also have a look at the coil pack.

cdc, June 2015
link Click here to see other fixes for Opel Zafira.