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56k time to change plugs?

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Old 06-03-2007, 04:19 PM
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Pest007
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Default 56k time to change plugs?

Anyone have suggested spark plug change interval? I'v got 56k on my 2002 GT it runs good most of the time but once and a while it gets a rough idle. I figured maybe poor gas quality, but it will idle just fine later down the road on the same tank. I've cleaned my IAC and rpm's don't really change, it's just a feels thing.





PS- yes I know it probably tells you when to change plugs in the owners manual, but my car didn't come with one!
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Old 06-03-2007, 04:36 PM
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cliffyk
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Default RE: 56k time to change plugs?

Ford says 100k miles, I've got 47k and will be doing mine next weekend...[/align][/align]
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Old 06-03-2007, 04:52 PM
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Pest007
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Default RE: 56k time to change plugs?

Yea, I'm driving to Vegas in a few weeks and just wanted it running smooth for the trip. I already bought my plugs, NGK Iridum plugs, damn things are expensive!! Oh well[sm=bling.gif]
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Old 06-03-2007, 10:13 PM
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Default RE: 56k time to change plugs?

I too am thinking of changing mine out soon. I am at 43,000. So....what brand/type of spark plug are you going with or would you reccomend?
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Old 06-03-2007, 10:16 PM
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roush17
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Default RE: 56k time to change plugs?

ORIGINAL: Pest007

Yea, I'm driving to Vegas in a few weeks and just wanted it running smooth for the trip. I already bought my plugs, NGK Iridum plugs, damn things are expensive!! Oh well[sm=bling.gif]
Have a blast in Vegas...I just got back last week. I think it would be a good idea. I changed mine when I first got my car and it only had 53,000 on it.
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Old 06-03-2007, 10:25 PM
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BuzzCut
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Default RE: 56k time to change plugs?

I changed mine out at 77K when I installed the aluminum crossover intake. They looked ok but since I had it apart...
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Old 06-04-2007, 02:54 AM
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Colorado_Mustang
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Default RE: 56k time to change plugs?

I change mine every 20k miles. And, the engine does idle and run better with each change (mileage goes up slightly, too). The gap is usually about .003"-.006" larger, too.

The 100k mile change is under ideal conditions. There are several articles around showing damage created when people take the 100k mile change interval literally. Every one of them shows a destroyed coil. If the plug gap gets too large, the coil needs to put out more voltage/power which can overheat the coil, leading to its ultimate failure.
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