Re: How do you avoid breaking the original spark plug...
You cannot thay are designed to another one of fords bright ideas there is a specila tool for under a hundred buck u can get from mac tools works great deffently a must have for a job like that
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The most likely cause is a bad ignition coil, remove the coil wire from the distributor and attach an old spark plug to it, have a helper crank the engine, and see if the spark plug fires. If the plug does not fire then the coil is bad. If the plug fires, remove a plug wire from a spark plug and repeat the process. If no spark then the distributor cap may be bad? Also have you ruled out no gas???
Your next step would be to check for injector pulse (signal at injector) and are the injectors working. Is the miss while driving, at idle, under load, or decell? What codes are u getting?
Cylinder misfire on #7.could be bad spark plug,or bad coil.try replacing coil and plug at# 7. It is the second last plug on the driver's side. If you pull the coil out and there is antifreeze in the spark plug hole,you may have a bad intake gasket or cracked intake manifold and the antifreeze is shorting the coil out. In that case you may have to replace the intake manifold.
They should be mounted down in the cylinder heads, you'll need to remove each coil pack. A long extension and 5/8in spark plug socket and an extendable magnet will help. Also, you may need to remove the fuel rail to get to move the coil packs.
I would visually check for spark at the plugs, to make sure spark is getting to the plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse.
How long since a tune-up? Any applicable trouble codes?
I would try to replace your spark plugs, and spark plug wires, My 88 Vic did the same thing...now it runs like a champ....you could also try fuel injector cleaner.
typically when you break a spark plug, it is the ceramic portion that breaks. the bit left in the engine would still be removable. if your worried, just spray a little bit of wd40 on the plug and let it sit for a few minutes. they should come out alright... just take care not to break the new ones on installation
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