singlespeed
Well-known member
with the spark plugs, it's probably worth while doing the set, even if only one of them is damaged. If you remove plugs, the compresion sealing ring may not seal as well as it should if you re-use them.DrDrew":1x06uqz2 said:Being a bit of a n00b for actual engine components, if for instance only one of your ignition coils had been corroded, would it still be necessary/best to replace all four?
The coil packs shouldn't need replacing unless they fail. Water tracks and rusty deposits down the sides or corrosion on the contacts will reduce the power being delivered to the spark plug. So, replacing a single one would be ok (imo), so long as the others were in good condition. However, replacing all 4 on a higher milage car may be good practice.