Incredible Instructions. Much appreciated. Extremely easy to understand visually.

Cinnamon Girl gets a thumbs up right from the start. Now for the video....

Thank you for the detailed instructions. Often people will skip minor but important steps, but you made it easy to understand. I have a rough idle and I think it may be due to this. I'll get started on this tomorrow.

Great video. Thanks. I just bought my first Jeep last month and am learning the ropes of how to work on it. I have a intermittent cyl 6 misfire when idling. Thinking the injector is gunked up with sand as my jeep just recently came to east coast from Cali. Going to do the 4 hole injector upgrade.

awesome dude that really helped out. great job

Great video I appreciate it

Another common cause for a 4.0 random misfire code, especially if you cant feel it or hear it, is a failing crank position sensor. The evil one on the bell housing. If it goes out, might as well burn down the jeep because its hell. Another thing worth mentioning, is these things like the cheapest most basic champion plugs, in copper flavor. .035" gap. When you get them they will be at .036" trust me that extra bit will screw ya. Some of the hipo guys will say gap them at .040". Unless you have a highly modified engine with all the bells and whistles, not worth it.

same leak happened with me, when working on your fuel rail and injectors next time you need to remove the fuel line from the throttle body where its leaking. When you were disconnecting the fuel rail it was still bolted to the throttle body and punctured a hole in the line. My fix was I got metal pipe cutters and cut the section out that had the hole, get rubber fuel rated hose, slip it onto the metal lines to fill the gap and then i put a hose clamp on each end and tightened with a Flathead.

My 2001 XJ after many attempts to find PO300 and numerous fixes it turned out to be a bad check valve on the fuel pump, pressure would fade causing start up misfire

EXELLENT!!

I did the DEI heat shield yesterday along with replacing the injector O rings. I'll heat her up today and see how she fares. 2001 xj.

Thanks for the tutorial! I have a jeep grand cherokee 2004 4.0 that will start for 3min and then shut off sometimes i have to wait an hour before it gives me another 3min have you ever dealt with a similar problem?

I meant @11:00

Thanks for the video. You mentioned in your description, and in the comments below that you upgraded your fuel injectors. Please, I have a couple questions, one concerning the injectors, and another concerning the heat shield. I'm currently installing a 1992 (XJ) 4.0L engine in my Jeep CJ, and I would please like to preemptively do the heat shields, and possibly also do the injector upgrade. Please, do you know if the CBXB060 Mopar heat shield will fit an early 90s 4.0L engine, and ditto for the injector insulator 56028371AA? Concerning the injectors, I found previously that injectors from a 1995-1997 Dodge Neon w/a 2.0L engine should properly insert into my fuel rail, and connect to my injector wire connectors without any modification. Please does this sound correct? I assume since my Jeep is manual transmission, I should get the Neon injectors for manual transmission? Thank you, Tim

I know it's a heat shield but it also stops crap from falling into the exhaust manifold and having a nice little fire later on. (oh, I see you used grease on the o-rings, that's a pro-tip. Also, check your intake for any missing o-rings that may have come off when removing the fue rail/injectors).

Not sure if you're still looking back at this video but I definitely have the same problem. Do you think just insulating fuel injector 3, like you did near the end of the video, would suffice? Or do all injectors need to be replaced and then insulated? I insulated my injector 3 and it worked great for a month, then the problem came back. Honestly might be because I didn't insulate it very well lol (I didn't cut it to fit as well as I should have). I am thinking about just trying to insulate it again but cut the insulation and fit it on better. What do you think?

Might want to put a rag or something in the hole on the intake manifold left by removing the throttle body. Don't want to drop anything in there

I have p303 misfire as well. I replaced the spark plugs , still misfiring. I’m assuming I have the same issue.

Hi thanks for the great video. I have looked everywhere for the heatshield even on amazon could you tell me where to find this Thanks

5.9 wheels!

Hey man great video. Unfortunately I am having a PO201-PO206 codes. My Jeep as far as I know has not had a heat shield on it since I got it. And I have changed injectors and cannot get rid of the code. Would heat shield remove the code?

Thanks for the info say not sure if you're still into video you're helping people out but I have a 2002 Jeep Grand Cherokee with a 4.0 and it spits and sputters while I'm turning it over and then backfires through the intake any help would be greatly appreciated.

Dude... put a rag or paper towels in the throttle body header. Bad news if you should drop something in it.😩

Where'd you get the parts?

It should be a new head the intake on one side and the exaust on the opposite side.

those have to be the worst fuel injector electrical connectors I've ever had to remove.

Did it help?

Where did you get your heat shield and injectors?

Dude. It aint running crappy from a heatsoak misfire. Youre damn throttle body was pert near fallin off!

Thanks for the video! So I just upgraded to 4 hole injectors on my 2000 xj. I changed the plugs and add a fuel rail and injector cover kit. www.amazon.com/gp/product/B015NOKWQY/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 I had heat sink issues when shutting off engine the exhaust manifold would heat fuel in fuel rail and fault out number 3. So far runs good but i'm having the same starting issue. Also, as I started to test drive I had no oil pressure. Don't know if the computer had to relearn the switch so I replaced that oil sensor switch and that fixed that.

plastic clip??...heat?? doesn't make sense @11:07

Great video, however this ain`t gonna do jack shit.

yep,that's how you do it...do all the hard work off camera then pretend to do it on camera while saying "just simply do this".....hahaha