Quote:
Originally Posted by Boxstard
I thought the coil either works or doesn’t and when it doesn’t CEL gets triggered and you know it from the code. I got a 97 with 98K miles, with what appear to be original coils. One tube had split but just used electric tape for insulation. I don’t mind replacing them if aged coils affect engine performance appreciably but I’m not convinced if this is true,
I had a 2003 Saab for 16 years and put 170K miles on it, and its coil cartridge is considered a wear item, replaced it every 30K miles or so and carried a spare in trunk just in case. It went through several design revisions too so apparently some design flaws involved. You still gets CEL and code to know it’s gone.
So it’s case by case but it seems coils on 986 are designed well and robust.
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Your assumptions are incorrect
Ignition coils can fail totally or they can exhibit intermittent failure.
They can also exhibit weak spark and never miss or fail.
Also there is no CEL (OBDII) code for ignition coils.
There are codes for misfires, but misfires can be caused by many factors not just coil issues.