Very detailed. Thank you!. FYI - Petroleum jelly will degrade rubber over time causing it to harden and crack, a silicon grease is a better option for lubricating o-rings

Just bought a 98 about 6 months ago. About to tackle this, replacing exhaust manifold and head gasket this weekend. Super high quality video, please keep them coming. I'm subbed.

Awesome vid! Informative, educational and highly entertaining😁

It may get better over time as well. I've heard the pcm can take up to 50 start ups to get the new fuel and air mixture perfect

I used k suspension 12 ports.. I sea foamed before hand did a tune up then changed them out post ecu reset and relearn I got about 14 to 16 mpg on 3 inch lift with 31s and a roof rack and trunk full of tools after adding a BBK throttle body and cold air I got about 17 running cruise control I’m happy with it mpg changes all the time so this was under best conditions

nice video - well, several opinions about 4 hole injectors - fuel pressure and pulse width are given values - change in fuel economy and performance are not really noticeable.

You can stuff the wire conectors with petroleum jelly to make them moisture resistant as well.

One issue you haven't addressed is your fuel filter. I've got a '93 ZJ with 123K and changed mine out at approx. 120K. The amount of black silt that poured out of the old filter was scary - I can only imagine the residue left in the tank itself. As everyone is probably already aware - • If your fuel filter gets clogged, it can reduce the flow and weaken performance as the engine has difficulties drawing fuel. • With a clogged filter, the fuel pump works much harder and you may have problems starting the car or notice poor acceleration or stalling... Because of its abrasive action, dirt and contaminants in the fuel can speed up wear and tear, damage expensive parts and even cause the fuel pump and injector to fail. • For most cases, the fuel filter needs to be replaced every 20,000 to 30,000 miles. • A clogged fuel filter can cause decreased fuel economy. I went from an average of 13-14mpg to 16-17mpg, just by changing the filter - even though I've been driving it a little bit more aggressively on the freeway. They're less than $20 for the 4.0 liter Jeep vehicles - some are less than 10 bucks. So, if you haven't changed yours yet, it may make a big difference in all around performance and fuel mileage. Thanks for sharing this content with us. - I Subscribed to your channel. 👊

I would use dielectric grease on the connections and the o-rings. Look into an oil catch can for better fuel economy

A cold day 😉🙊 But thanks. I have a spare intake I plan to clean and put new injectors in. Been wondering what's holding them in. Nothing.

I get 13-14mpg on worn 33's with 4.88 gears towing a trailer. Stock injectors. The roof rack and lights must be really killing your mpg. I see others suggesting ideas to improve mpg. One not talked about a lot would be to install locking hubs. Allows you to diconnect the wheels from the drive train so the front drive train doesnt move when going down the rd in 2 wheel drive.

Thanks for the video, I was surprised you only got a half mile improvement, I was expecting a lot more than that and 12-13 MPG with a 6cyl isn't very good, I thought those Jeeps got about 16-18 avg.

Man buddy you were doing such a awesome job right up to the point you used “Butt” connectors for the new wires🤷🏻‍♂️. Ya gotta know you are supposed to solder those wires and use heat shrink to protect the connection. But hey to each his own👍

Hmm my 96 gets 16.5mpg (18.2 hwy) and it's 236k mi, only thing done was the accel tune up kit. I keep going back and forth on doing the 4 hole injectors. But might finally do it, chasing the 18/20mpg.

"You mind yer damn business" 🤣😂

Awsome !

You mentioned heat soak at the end of the video, and it appears you do not have any type of intake manifold/injector heat shield. A company (Design Engineering) sells a heat shield kit for the Jeep 4.0L engine that protects manifold, fuel rail, and injectors from heat. For later TJs/XJs there is also a Mopar intake manifold heat shield (but to my knowledge no Mopar, fuel rail, nor injector heat shields). Also, please, what purpose do the cables running from your roof rack to your hood corners serve? Thx.

@jeepinjimmy what is the flow rate on these ?

Im assuming you're using stock gears? If you have a larger tire than stock nothing and i mean nothing will improve power and economy more drastically than regearing the differentials. 4.10 for 31in tires 4.27 for 33in tires 4.56 for 35in tires....to compensate for the extra rolling resistance and leverage of the lager tire one could decide to go a little more aggressive ie 4.27 for 31in, 4.56 for 33in, 4.88 for 35in. Btw according to the xj forums 33in with a 4.56:1 gearset seems to be the magical combo netting somewhere usually above 20mpg. Nice jeep👍

Why a lot other guys are getting like 17 mpg ?

Thanks god bless

What rims are you running?

Should have got new pins and connectors. Those butt connectors are the worst. Atleast get the non insulated type crimp them with an actual pair of crimpers and heat shrink it...

I dont think a mechanic should be driving around with an engine checklight on 😂

If you draw a pizza, you don't have to pay for it. But you can't eat it, either.

Mind Your Damn Business, lolol

The Chinese Bosch injectors are junk! I tried a set on my 2001 XJ and one was bad when I put it in. Withing days another failed. I pulled them all and put in a set of OEM injectors. The Chinese Bosch fuel pumps are also trash. "Botch" has never been a good brand in my experience. I didn't name then "Botch". That was an accepted description way back in the Sixties.

you should’ve used more JELLY you would’ve got more miles

I couldn't imagine being a grown man and wearing chapstick, disappointed

Nice vid. Thanks Where did you find those wheels

Cute vid - but the little one is the star -