changing spark plugs - Ford Mustang Forum

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post #1 of 9 (permalink) Old 02-11-2010 Thread Starter
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changing spark plugs

i have a 1994 Mustang GT 5.0 and I am wanting to change the spark plugs. can anyone show me how to do that with pics or instructions. Yes I am a beginner, but would love to be able to do it myself.

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post #2 of 9 (permalink) Old 02-11-2010
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There really isn't anything to write bud. Pull the wire off remove the plug put new one in without cross threading or over tightening. Anyway I did a quick google and this looks pretty good. I would suggest just getting one of your buddies to come hang out while you do it if your really this new at car maintenance. Installing New Spark Plugs - Replacing Your Spark Plugs - How to Install New Replacement Spark Plugs

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post #3 of 9 (permalink) Old 02-11-2010
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The plugs for the 5.0 usually takes a 5/8 spark plug socket. Pull the boot off and you might need extensions for a few of them. You want to be very careful when trying to get them loose, plugs have a tapered seat and tighten up but when they come loose you can really bang your hands and fingers. Just be aware of where your hands are for when that plug comes loose.

Take your time when installing the new plugs, it's easy to crossthread them. They shouldn't need to be forced, so if it doesn't go smoothly in you might want to try it again. When you tighten it with the socket, you don't want to honker down too much on them. They'll be much tighter to take out the next time if you do.

If you've never done this before, the best thing to do is take one out/replace it/reinstall the plug wire. That way you don't get the firing order mixed up. One plug at the time.

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post #4 of 9 (permalink) Old 02-11-2010
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I always use anti-seize on the threads when reinstalling them.

I don't buy any of this "platinum".... of whatever they can say to make it cost more BS. Autolite 25s are my favorite. Gap them, I think the stock recommended gap is .054" I usually make them a bit tighter, maybe upper-.040" range.
Don't crank the hell out of them when tightening them. The stock specs is only 7-14 lb ft for iron heads if my memory serves me right.

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post #5 of 9 (permalink) Old 02-11-2010
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Be sure to check the gap on every new plug before installing.....
post #6 of 9 (permalink) Old 02-11-2010
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another vote here against platinum plugs unless it's a stock brand new motor, in which case you would not be putting them in anyway.
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post #7 of 9 (permalink) Old 02-13-2010
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i remember my first spark plug many years ago... take your time, turn counter clockwise to remove, inspect the old plug, check color of the ends, ask a good mechanic the condition, if too white then your running rich, if black too lean. normal should be slightly white. use a little antifreeze on thread for the new spark plugs, gap them and dont use anything fancy, stick with Autolite 25s. if you are running stock wires, its probably time to change them. now would be a good time. 8m wires is all you need. good brand would be fordmotorsport/msd/accel...
dont overtighten the new plugs, as you can jump a tread and the s.plug can pop out (really bad). put a little electric grease on ends where the wires plug, same on the distributor ends. hand start the plugs into block, then use the wrench.
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post #8 of 9 (permalink) Old 02-13-2010
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If your car is stock, gap all the plugs to 0.054 before beginning. Unless you have aluminum heads, I wouldn't use anti-seize on the threads.

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post #9 of 9 (permalink) Old 03-22-2012
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You probably already got this done but here is a diagram which helped me out a lot. It's for 94-95 5.0s I found while using the forums:

It would be great if it was pinned somewhere easy to find.

My car is old but it still has a kick!!
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