Originally Posted by El Toro
Out of all types and vendors of spark plugs.
Does anyone have a good recommendation for specific type and manufacturer for a 93 wrangler 4.0L
I am the tech manager at Autolite spark plugs. If you search this forum, you will find many 4L wrangler owners running Autolite XP985 Iridium spark plugs. I run them in my 97 TJ 4L and they work great. They are by far the best bang for the buck. We have a great price advantage over our nearest competitor mentioned below in the fine wire iridium plug catagory. They are the best technology plugs for your Jeep and will easily last 100k miles. You can learn more about spark plug technology by visiting our Youtube channel and watching the Spark plug anatomy, Spark plug metalurgy and heat range videos. Find it at youtube.com/cadzillals6. At the very least, you will be a plug expert regardless of what brand you buy.
We have other ignition system and misfire diagnostic videos there as well. We also have a facebook page that keeps you up to date on our events and new training.