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Unless you're going to be putting lots of miles on I'd just leave them.
As a 25+ year tech I've changed countless numbers of these plugs, and extracted countless broken ones too. It doesn't matter much if you do them now or a few years/miles from now - they'll come out just fine. If one/two break in the process so be it, it's really not the huge deal that it gets made out to be. The plugs are super accessible in these cars compared to the trucks, which is the key if/when a broken one needs extracted. Easy peasy as they say
As a 25+ year tech, perhaps for you the extraction process is not the huge deal it gets made out to be and is easy peasy, however, for someone who has little to no experience nor familiar with the potential for these plugs breaking during the extraction process, it can in fact be a very huge deal as made out to be. Prior to extracting my plugs for the very first time, I was very concerned and also had doubts about the lisle extraction tool, meaning what could happen in the event if the lisle tool weren't able to somehow extract the broken section of the spark plug? this would then mean the only other option left would be having to remove the cylinder head in order to extract the broken spark plug.
Needless to say, I considered myself as very fortunate that none of my plugs broke when the originals were extracted over 6 years ago despite having less than 20k miles on them.
Thanks to following the recommended Ford TSB extraction procedure, I was fully convinced this was the reason that none of my spark plugs had broken.
Since then, I've always applied high-temp nickel anti-seize to the ground electrode shield section of the spark plugs and continue to follow the Ford recommended TSB extraction procedure. I also change my plugs between every 3-5 years due to running FI.
I agree with Sammy70. I haven’t heard of these plugs failing much, other than in the removal process. They should last 100k miles with no issue as efficient as these engines are.
I changed mine at 30k with the hopes that they would be new enough that they wouldn’t break. Wrong! So break em now or break em later. Purchase or otherwise source the use of a Lisle tool to remove the broken ones and have it on hand when you attempt the change. You’ll break less if you have it.
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If your plugs broke with just 30k miles on them? perhaps you didn't follow the recommended Ford TSB extraction procedure
There's also a spark plug extraction tool similar to the Lisle tool which is actually designed to prevent the early 3v spark plugs from separating during the extraction process. It's the OTC 6918 Ford 3v Engine Spark Plug Removal Tool.
Ford recommends changing plugs at 100,000 miles. If it were me, I would leave them and replace at 75,000. However, taking them out to get a good idea of engine health isn't a bad idea due to you recently purchasing the vehicle. Also, letting the motor get warm before removing the sparks makes removing them so much easier.
According to the Ford TSB extraction procedure, it is not recommended to extract the spark plugs on a warm or hot engine, but rather at room temperature!
CAUTION: DO NOT REMOVE PLUGS WHEN THE ENGINE IS WARM OR HOT. THE ENGINE MUST BE AT ROOM TEMPERATURE WHEN PERFORMING SPARK PLUG SERVICE. REMOVING THE SPARK PLUGS FROM A WARM/HOT ENGINE INCREASES THE CHANCE THE THREADS COULD BE DAMAGED.
