2 days ago I felt that something isn't right with my Ford. A mechanic told me that he wants to replace all four spark plugs and wires but could I just change the one?
I'm scared that he's ripping me off please help!
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Fear not, he's not ripping you off. Spark plugs are cheap, you change them in sets as you do with brakes or spark plug wires.
You want all of your spark plugs to match and have nearly the same levels of electrical resistance as all of the other plugs.
This make the engine run smoothly. If you had one spark plug firing properly and three that were not you could damage your engine as it would be a bit out of balance.
You want balance in your engine. You want balance with combustion. This gives you efficiency and as well, longevity, with your motor.
This is standard maintenance. I don't think anyone on this site would only change one spark plug on their own vehicle.
It's fine. :-)
Best of luck.
Here’s how it went for me. One morning, truck wouldn’t start, just kept turning over. It was 5 degrees out. I replaced one plug only. Truck started right up. Another issue I had was bucking on the highway. That still remained. When the weather warmed up I tackled the other plugs and wires as well. Got all but one. It was frozen. The truck ran great for about 20 minutes. Then worse than ever before. I sprayed the frozen plug with PB blaster the day before. That morning, got a good bite on it, turned counter clockwise, then clockwise a few times and went for it. It broke free. Swapped it out with the last motorcraft spark plug. Didn’t check gap. Swapped out the coil pack. Truck is running great with 200,000 miles on it. Not sure if it ran worse because I had one inferior plug and wire that wouldn’t jive with the rest or if it needed the coil pack as well. Also. Cut the hard to fish wires at the coil pack and duct tape it to the new one. It’ll save you 20 minutes as opposed to fishing it thru by hand. Good luck. Hope this helps