Fuel To Spark | Jeep 4 Liter Tune Up

[@matchedbook1]

Excellent tutorial. Those 4.0s are pretty bulletproof but a little PM never hurts. Thanks Jake.

[@machinesinc]

Gotta squeeze every little HP out of this thing I can!

[@justinbratton4385]

You claim to not be a “how to” channel but a good quality how to video here and there would be appreciated

[@machinesinc]

I’ll keep that in mind, thanks!

[@danhambrick6331]

Nice job Jake.I'm not a big fan of Autolite spark plugs but you are correct about the 4.0L prefers the copper core plugs...

[@machinesinc]

What’s your brand preference?

[@jarrodlopresto9861]

Most jeep 4.0 guys still run champion copper plugs but go with the next step up on heat range. They give you a better/cleaner fuel burn. I have to look in my tool box on what part number they are, but you will get a very slight mpg increase and power. Not noticeable unless the old plugs were just garbage. Again I'm saying slight not 10mpg or 30 hp.... slight lol.

[@ronmccall6511]

Very good tutorials. Can you please link that tune up kit

[@machinesinc]

Links to RockAuto don't always work great so the part number is 27625 if you need to search. But here is the link as well. www.rockauto.com/en/moreinfo.php?pk=1144914&cc=1180178&pt=684&jsn=13

[@ronmccall6511]

@@machinesinc Thanks for taking the time to reply. I have a 96 and 94 XJ and I love to watch repair/mod vidios on the Cherokee. BTW the link worked and I ordered the $30 kit. 👍

[@machinesinc]

Sweet, glad it worked!

[@projectbumblejeep4190]

DO you have any trouble with pump gas (with ethanol ) giving you any issues. I don't drive my jeep much (less than 5K per year) and gas with ethanol sometimes causes intermittent misfiring. God bless, stay well.

[@machinesinc]

Never had any issues along those lines