How can you tell if spark plugs or coil packs are bad? - Mustang Evolution

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Old 06-15-2012, 03:40 PM   #1
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How can you tell if spark plugs or coil packs are bad?

K my car just hit 45k miles should I replace them? Also any other matinence you suggest for the miles?
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Old 06-15-2012, 05:05 PM   #2
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Re: How can you tell if spark plugs or coil packs are bad?

follow the factory spec's, it is right in your owners manual
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Old 06-17-2012, 11:28 AM   #3
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As far as a coil goes, when you get engine code that indicates a misfire or rich condition. If you are concerned about the spark plugs, just pull one and see how well the tips are holding up. At 40k it's sort of soon for either of these to require replacement, however if you regularly run cheap 87 octane fuel, then the plugs may have carbon build up.
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Old 06-17-2012, 05:11 PM   #4
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Quote:
Originally Posted by GTRob504
As far as a coil goes, when you get engine code that indicates a misfire or rich condition. If you are concerned about the spark plugs, just pull one and see how well the tips are holding up. At 40k it's sort of soon for either of these to require replacement, however if you regularly run cheap 87 octane fuel, then the plugs may have carbon build up.
I only run premium 93 fuel a buddy of mine was saying I needed to replace all my plugs and coils at 40k miles and I thought it was like 60k to 70k miles
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Old 06-18-2012, 08:28 AM   #5
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Quote:
Originally Posted by Jgill1992

I only run premium 93 fuel a buddy of mine was saying I needed to replace all my plugs and coils at 40k miles and I thought it was like 60k to 70k miles
I only replace coils when they are bad
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Old 06-18-2012, 08:57 AM   #6
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I would do the spark plugs now, they might be good but best to change em now while it's easy then wait till they are all carboned up and break on you
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Old 06-18-2012, 09:19 AM   #7
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Quote:
Originally Posted by Jgill1992
K my car just hit 45k miles should I replace them? Also any other matinence you suggest for the miles?
I replaced mine at 36000 miles cause I was unsure how old they were. But they were so cheap (used Motorcraft), that I would do on newer cars too. Plus, it will give you a chance to see how your tune is running.
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Old 06-18-2012, 09:46 AM   #8
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Re: How can you tell if spark plugs or coil packs are bad?

I agree with your buddy, go ahead and do the complete Tune up, get the new plugs, and Coil packs, you won't regret doing it, I did mine and my miles were around what yours are. I feel a better performance. I got the MSD Coil packs, my spark plugs are the HT1 by Autolite, I also went ahead and did a Oil change and etc.
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