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Old 07-10-2008, 06:47 PM   #1
slv01sc2
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Default I'll move this question about spark plugs

My 01 SC2 has 121,000 miles on it. I changed the plugs and wires(NGK) at 90,000 miles at the Saturn Dealer. The car is getting it's best gas mileage ever. Do you all think I need to change the spark plugs because they have 30,000 miles on them, or can I go a bit longer? I don't want to mess with the car because it is doing great! How often should I change the plugs? I have every 30,000 up until this point.
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Old 07-10-2008, 06:54 PM   #2
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Default Re: I'll move this question about spark plugs

If they are working good, leave them alone. The wires and plugs are supposed to be good for at least 100,000 miles if all else is in good order. When the gas mileage drops, change them.
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Old 07-10-2008, 07:47 PM   #3
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Default Re: I'll move this question about spark plugs

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Originally Posted by OldNuc View Post
If they are working good, leave them alone. The wires and plugs are supposed to be good for at least 100,000 miles if all else is in good order. When the gas mileage drops, change them.
Copper plugs should be changed every 30K. They cost about $2 a piece and maybe 20 minutes of your time to install, why would you even question it? Spend the $10 and replace them.
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Old 07-10-2008, 08:43 PM   #4
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Default Re: I'll move this question about spark plugs

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Copper plugs should be changed every 30K. They cost about $2 a piece and maybe 20 minutes of your time to install, why would you even question it? Spend the $10 and replace them.
But if it ain't broke, why fix it?
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Old 07-10-2008, 10:25 PM   #5
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Default Re: I'll move this question about spark plugs

Pull the plugs and take a look at them. If they are gunked up (like 2 of mine usually are), change them.

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Old 07-11-2008, 04:22 AM   #6
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Dizzy Re: I'll move this question about spark plugs

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But if it ain't broke, why fix it?

It's called preventative maintenance. You replace the plugs before they get fouled and start missing. It could be dangerous if you are in a situation where you need power and suddenly the engine starts sputtering due to bad plugs.
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Old 07-11-2008, 09:27 AM   #7
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Default Re: I'll move this question about spark plugs

If you monitor your fuel mileage and general performance you will know when its time to buy new plugs and wires. If you do not, then change them on a schedule that you like. Plugs and wires are excellent components for predictive maintenance.

For information, predictive maintenance is the refurbishment or replacement of a component based on the monitoring of its performance. Preventive maintenance is the refurbishment or replacement of a component based on a fixed schedule.

Oil changes based on mileage are preventive maintenance. And oil changes based on oil sample results are predictive maintenance.
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Old 07-11-2008, 11:24 AM   #8
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Default Re: I'll move this question about spark plugs

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It's called preventative maintenance. You replace the plugs before they get fouled and start missing. It could be dangerous if you are in a situation where you need power and suddenly the engine starts sputtering due to bad plugs.
While it is the case that over time, the chance of missing more/getting fouled can go up; the car would notice (would be thowing codes) if it was missing to the point of causing a problem. If he's monitoring his car to get MPGs and performance to this point, he'd be noticing problems, which he isn't; because of that, I disagree with the 'preventative maint' angle.
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Old 07-11-2008, 11:33 AM   #9
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Default Re: I'll move this question about spark plugs

In agreement with the 30k change on plugs, and personally feel that most wire sets are good for 50k or so... . I can't see to find any "lifetime" wire sets - NAPA and dealers are both 1 year warranty. NAPA is 16 bucks, dealer is $35.
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Old 07-11-2008, 11:40 AM   #10
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Default Re: I'll move this question about spark plugs

Standard brand and Autolite spark plug wires should be lifetime warranty.
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