I had this issue on my 01 Cherokee. Would happen every time I started my Jeep shortly after turning it off. Engine would either start and rough idle for about 20 seconds, or it would start and then die. It would give me a check engine light and code for misfire in cylinder 3. I replaced the heat shield and added that other part for the #3 injector. Now when it heat soaks and I start it, it will do the same rough idle or die, but this time gives me codes for multiple misfires. My aux fan does work properly and turns on when the temperature gets too high, however it wont turn on until the engine is actually on to cool off the engine. So I wired a switch to the cable that powers the aux fan. Now I can turn the aux fan on whenever I please. Before I start the engine, I'll start the fan. Let it run for 10-30 sec depending on the temperature. Starts up just fine every time, even if the temperature is over the normal 210-212 it operates at. Haven't had a heat soak problem since.

pretty exotic esoteric complicated and subtle problem... good share

Maybe I overkilled a little but I was sick of this Problem , I ordered 6 upgraded reman fuel injectors off of ebay ( approx $80) , I replaced the Heat shield mentioned in this video except i got two and doubled them , went to auto zone and purchased those Accel mesh type heat shields for plug wires and put them over my injectors and they fit like socks And I have pictures if You PM me on FB.( I didn't notice until I removed My injectors that 3 of them were cracked from heat ) It fixed My problem , looks neat and with the new type injectors increased My MPG ..

Mount a metal flat shield between the intake matching the holes, it desepates heat the use for carbs.

AJ Philips , I agree there is probably no way to over do anything while repairing a jeep ...

my 97 wrangler never had this problem just the normal bad drainback valve problems of that year but my 96 grand does it a lot and the first couple times were really weird. it would stop idling so i would have to do drop it into neutral to keep it running driving home when coming to a stop to keep the rpm up. had it die as i rolled back into its parking spot in the driveway, I tried restarting for shits and giggles and it ran perfectly fine

That large foil "heat shield" was actually a recall addition on most 4.0 L engines to prevent debris from building-up and catching fire eventually. It is not intended to block heat, though I assume it would keep some ambient heat from flowing upwards just being where it is. It looks like you do enough offroading that debris actually gets up there, so its good to replace it as long as you were adding the sleeve over the injector anyway. But I have the same problem after a heat-soak with my 2001 2wd Cherokee, sometimes severe enough that the CEL flashes and I have to shut it down for 15-20 minutes and let it cool before it restarts properly. But since I am strictly city driving, I'm considering removing that debris shield completely to allow for air-flow while driving, as well as adding the heat-shield sleeve. Hope this fixes it :).

Thanx brother for video I've got xj cherokee 4.0 doing the same and dieing at idle. it want start back tell cooled off. I can pore water on the injectors and it will start up and run fine.

Thanks most places didn't have the part number in file. I did however find it on summit racing and ordered it. It is the same kit that you use in your video

My TJ is doing the same thing. Thanx for the video.

Great video

I had the same issue (P0303 & P1494) on my 04 GC WJ. 2 of my injectors (3&4) were cracked from the heat. I replaced them and she went back to normal. I definitely will be getting the heat shields & injector heat shield sleeves.

I just had this exact same problem with my wj, I pulled a boat to and from the boat launch about 7 miles away on 105 degree day, after I got home and put the boat in the garage, I started it up and it was misfiring, then the next day I was checking the AC refrigerant and it idled for 20 minutes or more, I shut it down and when I fired it back up the misfire came back, with an engine light, cylinder 3 misfire

Very good video- you made it easy to follow- learned something- Thank You- God Bless

buenas amigo mi camioneta grande cherokee limite 8cilindros motor 5.2l limpie y los inyectores bien trabajo bien por um mes luego le cambie la bomba de agua, resulta que la prendo y la sorpresa los injectores me empezaron a botar gasolina por la parte de arriba de los injectores le cambio los gomitas por tres veses y sigue igual tiene buena presion de gasolina gracias de venezuela

Did it fix your issue? I think I am having this issue. Had a new engine put in and I dont think there is a any heat shield on it at all.

My 2000 WJ is doing this I hate it. it runs so damn smooth after I restart it. I hate how it runs so smooth then so badly after it restarts. hopefully heat shielding helps.

Cool I’ll be doing this on my 01 XJ in a few days... did this solve the issue for you? And did the zip tie hold or did it melt away?

those plastic cover will hold moisture which will leek into the cylinder over time

Basically a great video and informative. But did you bother to count the number of times you used the word "basically?"

If I spray paint the aluminum heat shield black, do you think it will take away from the heat protection? Also my heat shield didn't come with a new plastic hold down, hope I don't break the old one 🤞 or I'll just use some high heat rtv.

Can u send a link for the wraps and the shield

any of you guys get an actual check engine light with a misfire code?? po301-306

Have the same problem with my 2005, did the same treatment. Didn't work.

Where did you get the cheap kit. Even on ebay they are asking 51 bucks

Did it fix your problem?

Code P0351 and missfire 1 and 6....jeep wrangler 2002 4.0L , ManuaL Trans.. I try many things even try a new coil pack nothing works,,,any suggestions? the Tech thinks it probably the ECU ;;but i dont really beleive it ;;; PS the car run great ; drive but loose power ...AGAIN ANY SUGGESTIONS; PLEASE..

Does anybody know if this problem can effect your gas mileage?

Listen up tubers. Seriously I fixed my heat soak issue on my Jeep Grand Cherokee 4.0l. It has something to do with the return fuel line back to the tank. I believe there’s a check valve or something that goes bad. Replacing the fuel pump solved my vapor lock issue. I just want to help other people that are dealing with this issue. I can give you the details lmk.

I guess am missing that part 😮

94 grand Cherokee doesn’t have that shit. But always works fine. Should I get one ??

Great share. Thanks...... Vinojack 2006

I have a po0300 and a p0301

Good video. Not to be a speech nazi, but to follow up on Thomas Darby below: You said "Actual/Actually" 19 times and "basically" 21 times.

no parts needed.turn your key to the spot where you hear the ding ding ding. let the car go through all the dings and till the check light on the instrument panel stop changing. it is doing calibrations to run correctly. and must finish.did you have a dead battery or disconnect it lately? i fucked with mime fore ever before finding out this trick. you may need to do it a few times .and a new battery will help. for some reason these cars need a consistent full charge or you will have to do what i said whenever the voltage gets too low. please try this .it works.

but good vid

You speak like you don’t know what commas are

Jeep are nice to look at but are shitty cars so is Chrysler. They need to sell out to chevy