Quote:
Originally Posted by floydarogers
I don't know why you would want to replace all the coils when only one is bad. Coils usually last (as one poster noted) well over 100K miles. The likelihood of another failing is quite small; why spend more than you need to?
Have you isolated it to the coil? You don't specifically say if you eliminated the spark plug as the cause.
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It's a cost/benefit thing.
Losing a day or two of use waiting for a new coil to arrive (when the 2nd, 3rd, etc fail) is more inconvenient than spending the money to buy/install 6 new coils.
And they never fail at a convenient time.
There are plenty of threads here where folks changed one coil only to have another fail a couple of months down the road.