spark plug mileage replacement time? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-26-2013, 02:52 PM   #1
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Default spark plug mileage replacement time?

Bonneville seems like it'* taking a little longer cranking to start, but it'* hard to tell as these things deteriorate gradually over time.

Car has AC 41-101 iridiums in it with 30K miles on them. Would I be wasting $20 by changing the plugs and not notice a difference? I'm aware that iridiums are suppsed to last a long time.
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Old 11-26-2013, 03:33 PM   #2
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You would be wasting money. Let'* try something different.

Carefully, step on the accelerator, I mean just a tad. We want to crack open the butterfly plate just a tad. Now, turn the key to start the engine. Does it fire right up?
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