Is you car misfiring, or just down in power?
It may be time to change those spark plugs!
Welcome to the latest #CheapJeep post! Check out the other posts here! Spark plugs can last anywhere from 30k, to even 100k miles depending on what type of material they're made of. Plugs can be copper, platinum, or iridium tipped. Our Jeep wasn't necessarily misfiring, but I knew it was time to replace the plugs, wires, and distributor cap/rotor. For some reason Chrysler decided to bury the cap in the back of the engine under the firewall, so it wasn't fun fishing it out. Other than that, it was a quick job.
I'm not going to go through changing a cap and rotor because most 1996+ vehicles moved onto using coil packs, plus changing the cap and rotor was hard to take pics of, because it was so buried in the back. So all I did was take out two 7mm bolts holding on the cap, then pulled off the rotor, and reinstall.
Old corroded points in the cap.
New cap.
Old corroded rotor vs new.
I first marked on each wire what number cylinder it is, that way I could reinstall the wires correctly. This can be done by googling your vehicles firing order. Example: The 5.2L firing order that is in our Jeep. Just image a wire going from one number to the matching number. After numbering the wires, I pulled them all off. If you don't want to number them, just do one plug/wire at a time.
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After pulling the wires out I used a 5/8" spark plug socket to remove the plugs.
Then I reinstalled the plugs after making sure they were gapped at .035". Next is an annoying part, matching up the wire lengths. When you remove a wire you have to match it to the new one and make sure it's the proper length. This has to be done for each. wire.
After you have determined the correct sized wire for each one, plug them back in and route them how however you need to so that they aren't too loose or tight.
