I had a tight idler pully that was going out that helped make my idle high, also air conditioner was tightening up inside, causing drag. My throttle position sensor was bad, which mostly finished fixing it. Also, jeeps wire harnesses tend to be cut to pieces near engine bolts, especially in back. Your largest vacuum leak is probably in the back where gas tank epa canisters are hooked up behind left fender for laredos

Thanks brother just got my jeep running and I think this will be my next fix

Thanks for the video! I just solved the same problem with my 2000 Jeep Cherokee. Made a short (less detailed) video if anyone wants another reference.

@thecherokeechannel688

5 жыл бұрын

I'll go check it out!

You throw in some funny stuff man. The cat, death grip, etc. Oh and the vac leaks are classic jeep bs.🤙🏻

Great video. Very helpful

I had the same issue with my 1999 cherokee xj. The idle would rise and fall like I was pumping the gas pedel. Ended up after checking for vacum leaks and changing all the sensors on my throttle body, the problem was my upstream o2 sensor.

FYI you don't have to take off the throttle body

Good vid, thanks

Did you figure out if it was a vacuum leak or why did it have a very high iddle

My 98 xj has a rough idle and the engine stalls when I slow down or come to a stop. Any advice?

I replaced my IACV and the idle would still climb to 2500 at idle. It turned out to be the electrical connector wasn’t seated all the way.

I bought one at advance for 75.00 even though there 7 bucks on ebay buy i couldn't wait for it . I like all my junk running not sitting

Erase the ecu by disconnecting the positive battery terminal and grounding it to the ac pump for 30 seconds then reconnect it, this will allow the ecu to relearn the new sensors and run better.

@colin5064

Жыл бұрын

You are spot on Sir

Lots of comments on the idle speed. Based on my XJ which is a 96 4.0 it runs at 800 rpm. This is the IDLE mode. On a "96" model the powertrain control module (PCM) gets it's input from the A/C, Battery Voltage, Crankshaft position sensor, engine coolant sensor, intake manifold sensor, Manifold absolute pressure(MAP), Throttle position sensor(TPS), Camshaft position sensor in distributor, gear switch(automatic's), Oxygen sensor. The PCM takes all these signals to run it at 800 rpm. If something is bad the computer is going to run at a higher speed or not at all.

@belamtn

2 жыл бұрын

I want to pick your brain Sir. I deliver mail out of a '96, and am having issues with idle jumping to about 1100-1200 when I put it in park. Sometimes I can rev it, and it will settle to the 800. Care to take me under your wing? So tired of mechanics guessing.

@jeep146

2 жыл бұрын

@@belamtn We could try. I just had a problem with my Jeep when I would go over speed bump or if I made a quick stop my engine would shut down. Drove me nuts the only code was for a idle air valve. Finally found the wire that goes to the distributor was bad. The valve was okay. The first thing to look at is all the vac hoses make sure you have NO LEAKS, go to a auto parts store and check your battery and alternator. Is this with the A/C on or off when it happens?

@belamtn

2 жыл бұрын

@@jeep146 OK, here goes......The AC has been removed, and the switch for it is never on. Any chance the PCM is pissed at getting no signal from there? Can I block/fake it? Some other tidbits about my little fella: New engine installed about 2000 miles ago. Battery and alternator are new. I'll have the VAC checked. I have a persistent code P0420, Cat sensor (downstream), and CEL is on. I replaced the CAT last March and it's the second sensor installed. I have NOT confirmed my CAT has failed this time, but it is certainly the suspect given the sensor is new. I am hoping to try the spacer trick on it Sunday to fool the computer and get the CEL off. No OEM CATs available I am told, and I hear nothing good about aftermarket ones....so WTF. I installed a new OEM TPS this Summer, also the MAP and distributor are new. I KNOW NOTHING about the gear switch you mentioned above, or the intake manifold sensor. What say you? ANd sorry if I sound like a dumbass, I'm really not one.

@jeep146

2 жыл бұрын

@@belamtn No problem, If the a/c was removed and you didn't have problems we can move on. The new engine part is another reason to make sure all your vac lines are tight and in the right place. Be careful with some of the videos some will mask a problem not fix a problem. Your CAT should be good unless it was bad to begin with. The 72 code/P0420 looks at your O2 sensors, your Cat may not be bad just your sensors. To test the Cat I haven't done it in awhile but you remove the sensors and read the pressure and also look at the temp coming in and going out. This is very important to fix these problems. The computer needs to know how rich or how lean to set the engine. Everything is calculated in the computer when people try to fool it the computer can never do its job right. The O2 sensors can get dirty they do have videos on how to clean them before replacing them, just clear the fault codes when you do. If your old engine was burning oil that could mess the sensors up to. The TPS usually screws up when your driving, my MAP just made it run like crap all the time. Check the engine grounds this is very common on jeeps to have bad grounds to the engine block. You really need to fix that O2 problem. Does the gauge read correct temp when it is warmed up? The Gear shift is used when starting, not your problem. If you have a meter you can check the intake manifold sensor. it sits near the throttle body on the manifold it should read less than1340 ohms when warm. Also beware some people adjust the throttle set screw to lower the RPM never do this. If the old engine ran okay but the new one runs fast check all the connections and the hoses.

@belamtn

2 жыл бұрын

@@jeep146 thank you, I've got a couple things I can do here at my friend's shop this weekend, I hope he's available anyway. I'll report back!

On my 2000 wj, my normal rpm is 650. Perfect idle speed.

Have the exact same problem after TB cleaning and 4 hole 24lb injectors. Only way i was able to fix the idle was to adjust the idle screw from the bottom side of the TB

@jat-justamaturetech-philpj8285

11 ай бұрын

Hi. I put 4 holes in, now I'm running rich with Codes po172, po175 oxygen sensors. I replaced both up streams, no change. Having a rough idle now too that I can't find. IAC was fine Before new injectors. Thinking of going back to a one hole? Any suggestions?

My Jeep is a 99 has257678 miles had it since ,05 had 68555 when I got it thank it needs a tune-up

@indridcold8433

3 жыл бұрын

I hope you still have your vintage Jeep. I have a vintage 97 Wrangler TJ I bought new back in late 1996. She has 415,000 miles on the odometer. My ECM just went bad and I had to jump 12 volts to the fuel pump and the injectors. She is running rough when cold. This is the first timed she has ever fallen ill. Never part with your vintage Jeep.

ya bro the idle is going nuts still... hey i like the cat

I've found that the jeep inline 6 really only works well with mopar OEM tps.Most after market throttle position sensors use inferior parts.If you have a shop level scanner,you will see in most cases cheap sensors the values will be all over the place

@thecherokeechannel688

5 жыл бұрын

Thanks for the info. This jeep hasnt really moved. Its been awhile since this happens but i might look at it soon now that i tackled a list long of upgrades to my other jeep. Will post a video about this too if i figure it out. Thanks!

@cooperharris1505

Жыл бұрын

Exactly, I've ran through 500ish bucks in Aftermarket parts. Crank sensor, IAC, VSS, etc. None of them worked right but as soon as I put the OEM part in they work perfectly.

@andrewcheatle4691

Жыл бұрын

I've used Standard Motor Product brand cam, crank sensors and other products & never had an issue - just my 2 cents

I've seen the needle more drastically like this before, I'd look for a leak in the exaust. Stick your hand on the back on the muffler and check the pressure. I also agree with the other poster about the idle. I've got the sam issue but I'm at 700 right now, I'm just holding off until after winter, I'm fixing the radiator stuck on while starting, not kicking off.

@thecherokeechannel688

5 жыл бұрын

Need to check. This jeep wasnt even starting😂. It sits most of the time.

Idle is way high should be 750rpm and is rough.

@dogsky9044

4 жыл бұрын

its off vacuum line from manifold maybe

@officialWWM

2 жыл бұрын

That’s kinda the point of the video 🙄

I think it resets a 45 MPH your idle should go down and act right after

Nice.I should do this to mine.

idle is supposed to be 750rpm in neutral and is controlled by the computer. if the computer can't get the idle to 750rpm, you have other issues.

My Jeep was in a flood for a day under water up to dash, I got it “running” but it idle really rough and shut off if you don’t give it some gas. Would this be my problem ?

@ozzystuckman5162

4 жыл бұрын

You ever figure that issue out my does the same thing

@BradleyBeeksAdventures

4 жыл бұрын

Ozzy Stuckman my problem was the tank still had some water in it, so I cleaned it out really good and changed the filter as well. Worked fine after that. I drained my oil 2-4 times, took plugs out turned over a couple times till all the water shot out, put new plugs in. That’s all the stuff I did.

@mikeirl3565

3 жыл бұрын

Oof, im not a mechanic, but I got a jeep myself, and you may actually be having electrical problems if you've done everything right to get water out of the engine

@BradleyBeeksAdventures

3 жыл бұрын

@@mikeirl3565 hello, I got it running fine but I sold it before I ran into the bad electrical problems if they ever do happen, the guy knew it was in the flood defiantly made sure he knew haha

@mikeirl3565

3 жыл бұрын

@@BradleyBeeksAdventures Good deal bro, it'll probably be fine, just takes a little more damage control know-how then we know how to do lmao, I wish that dude good luck, electrical is always "fun"

I just had something happen now, I drove my xj about 40min , parked, set the xj on park and idle was at 1000, I turned it off and turned it back on and it jumped to 3500. Never experienced this before, any ideas?

@thecherokeechannel688

5 жыл бұрын

Found out that mine has a vacuum leak somewhere (reason its running over 1k rpms after all this). Its probably what you have too

@maximusilive4theking986

5 жыл бұрын

@@thecherokeechannel688 could be, hopefully it gets me home

You do not need to pull the throttle body to doan IAC swap! Also, his RPM's were 1000 after he swapped the IAC; this is NOT idle speed. At this RPM the engine is running, not idling, and the IAC serves NO PURPOSE! My guess is he has a vacuum leak or a misadjusted idle speed screw on the underside of the throttle body!

@niks983

5 жыл бұрын

@canuckguy worried naw removing the throttle body to replace the IAC is like wiping before you shit.

@geow.4809

2 жыл бұрын

I had an issue with my YJ for years with high idle when ambient temperature started to hit mid 80's. 1100-1200 RPM when 80-ish outside, to 1800RPM if it was 90+ outside. Found a mechanic that figured out the computer wasn't relearning the new IAC Valve after replacement. He was able to reprogram it to work correctly. SO happy to have it working correctly again! And, that idle in the video is too high, should be like 700-800RPM.

@rjvowels

2 жыл бұрын

Removing the throttle body actually makes it way easier.

@johnhhinton5473

Жыл бұрын

@Nick Gur If the T/B has not been cleaned in a long time (or *ever*) it is worth removing it to *clean thoroughly*.. Especially the IAC housing!. I remove the IAC, TPS and MAP (if yours is located on the T/B) also remove the IAC *housing*, and *clean everything* Unnecessary?, No, not to me. :)

Cat was providing a cat scan.

The one they’re trying to give me at the parts store is shorter and idles high like it’s being floored. 😑Help

Orientation, what would happen if it got turned around, I mean it's round ?

@cousin_JACK

2 жыл бұрын

It won’t start, at least for me I swapped in a new alternator and starter along with the sensor and was about to unbolt the starter when I decided to flip the sensor and bingo.. power, initially I had positioned it so the wire opening to the sensor would point down so as not to allow water in but the Jeep wants it ass up for whatever reason

Coil pack hold down screws are missing.

@thecherokeechannel688

5 жыл бұрын

It has a different head. The stock one cracked

What about engine shutting down with fluctuating to low idle rpm

@randybarnes8454

2 жыл бұрын

You may have already fixed your jeep Cherokee but here's what happened to me. I have a1993 Cherokee and it would stumble and have a rough idle. The throttle body was very dirty with carbon so I removed it and cleaned it with carburetor and choke cleaner. Removed the idle air valve and cleaned it to. Reinstalled everything and then the idle was at 1200 rpm. No vacuum leaks. I had to adjust a small bolt on the throttle body leaver butterfly to lower the rpm's to 800 with a warm engine. But it still would stumble and cut out until the engine warmed up. But the idle was performing perfect. So I checked the engine codes in the computer by counting the blinking dash light and it said I needed a oxygen sensor. Installed a new one and that fixed the stumble. So now it runs great. Oh it's got 348,000 miles. Good luck.

@KRALTAIR47

2 жыл бұрын

@@randybarnes8454 Thank-you very much. I fixed it a few months back. I cleaned my throttle body as well and put in a new iac valve. Been working so far. Damn that's a shit load of miles lol. Mine is in the high 200s

You should of done a before an after so we could of seen the change.. just saying

@thecherokeechannel688

4 жыл бұрын

My bad. My video shooting skills are pretty sucky 😂

@michaelwright3782

4 жыл бұрын

Changed out mine and the idle went way high,ran better with the old one any ideas,

@erictharp6095

4 жыл бұрын

@@michaelwright3782 spray all around the vacuum lines start to end with carb cleaner to see if the idle changes

@Adikxx

3 жыл бұрын

"You should of done"? What language is that? Did you want to say "you should HAVE done"?

@vtmz9589

3 жыл бұрын

adikxx83 ok mr perfect, i didnt know you were a teacher , i didnt know we have to spell check on comments

Still idling high should be approx. 800 rpm normal operating temp

What would happen if you put the IAC Valve in wrong orientation?

@mikeirl3565

3 жыл бұрын

Nothing, internally the valve is the same, the main, and the really only problem you'd have, is going to be that you have to twist your wiring harness around to reconnect it, which on an old jeep with brittle wires can be a big no no

No hay videos en español

After swapping the IAC, drive the vehicle five miles or so at 45 mph to allow the brain to reset the idle to norm.....serious, it's in the installation instructions. Dig 'em outta the trash and see......lol.

@thecherokeechannel688

5 жыл бұрын

Yea. Thing has a vacuum leak i changed the IAC on my other XJ and it ran fine. This ones just a pain in the rear to track down that leak.

@lifeofky4037

4 жыл бұрын

The Cherokee Channel try smoke testing it. It will make tracing it a lot easier

I took the throttle body off, and there is no gasket. Does that matter, because it always ran good up till now. It smokes bad and runs rough until it warms up, and then it's good. I hate to replace parts and it doesn't fix it.

@moparelvis

4 жыл бұрын

Jeffro you should have a gasket, yes. You sure it didn’t stick to the bottom of the throttle body? As far as running rough til it warms up, that sounds like it could be your O2 sensor. The one before the catalytic converter

@jeffro4kag206

4 жыл бұрын

@@moparelvis I checked both sides for gasket, but it isn't on there. I scanned it and the code for the O2 sensor came up. Your right, thanks

@moparelvis

4 жыл бұрын

Jeffro get yourself a gasket. They’re cheap. Make sure to just get a NTK O2 sensor. Avoid all other brands

@LDeezy662

4 жыл бұрын

Did you ever figure out your issue? I'm having same problem rough idle until warm

What sensor is at 7:10

@slowmaro8809

4 жыл бұрын

Cam position sensor

This idle is too high. 800rpm is what the warmed up engine would be doing

I really hope you are still with your girlfriend. She is automatically sexy because she drives a Jeep. Please forgive me noting the obvious. She can not help but to be sexy when she'd drives a vintage Jeep. Love the cat.

60 bucks!! Dang it. I think that's what's wrong with mine.

@luketrochinski3954

4 жыл бұрын

Rockauto, $7.50

here is some THAT really has no idea what he is doing the gasket needs to be replaced and what other short cuts did you take ??? your IDLE IS TOO HIGH

@mikeirl3565

3 жыл бұрын

Hey chill bro, idk if you own a 90s-2000s Jeep or not, but out here we cut corners, and it's not that we're all cheap, its cuz these 4.0's can just take it, they're not Priuses, I didn't replace my gasket ether when I cleaned my throttle body

Why on earth did you pull half the car apart to replace this thing? 😂

Idle too high

way to high rpm

M.A.P SENSOR FUCKED UP

Oh yeah and the cat will not help the motor run any better, just saying

Damn cats bahhaa wha u doing in there

My local O’Reilly wants $79 for that IAC. Amazon has them for around $20. Would anyone here trust it ? because I’m skeptical

@luketrochinski3954

4 жыл бұрын

Rockauto, $7.50

@victorjramirez1948

4 жыл бұрын

Luke Trochinski Thanks

@luketrochinski3954

4 жыл бұрын

@@victorjramirez1948 Hey buddy listen, buy that IAC motor, remove your throttle body, clean it and get all the carbon deposits off. Brake clean, or throttle body cleaner, and a small wire brush works. It doesn't have to be perfect. But the major thing that fixed it for me was effectively cleaning the housing that the IAC screws into. And if your screws strip out like mine did, just find another screw that threads in tight. My jeep runs perfect now, no dash lights. I am, by the way, a professional mechanic. Let me know if you have issues.

@davidosorio6068

4 жыл бұрын

@@luketrochinski3954 YOU COULD HELP ME, I HAVE A ZJ ORVIS EDITION 95 4.0, WHEN IT IS IN DRIVE SHUT OFF, CHANGE THE TEMPERATURE SENSOR AND NOW I REMAIN IN 1000RPM DO NOT BECAUSE, ONLY CHANGE THE TEMPERATURE SENSOR NOW WHEN YOU WANT TO TURN OFF ONLY ONLY VERY FOLLOWED ONLY AS 2 OR 3 TIMES EVERY 10 MINUTES ONLY WHEN IT IS IN DRIVE, IN NEUTRAL DOESN'T, DOES NOT LIGHT THE CHECK ENGINE, WHAT CAN IT BE?

@davidosorio6068

4 жыл бұрын

@@luketrochinski3954 YOU COULD HELP ME, I HAVE A ZJ ORVIS EDITION 95 4.0, WHEN IT IS IN DRIVE SHUT OFF, CHANGE THE TEMPERATURE SENSOR AND NOW I REMAIN IN 1000RPM DO NOT BECAUSE, ONLY CHANGE THE TEMPERATURE SENSOR NOW WHEN YOU WANT TO TURN OFF ONLY ONLY VERY FOLLOWED ONLY AS 2 OR 3 TIMES EVERY 10 MINUTES ONLY WHEN IT IS IN DRIVE, IN NEUTRAL DOESN'T, DOES NOT LIGHT THE CHECK ENGINE, WHAT CAN IT BE?

RPM is too high

Are you CRAZY? The IAC is held on with two torx screws. You don't need to touch ANY of the other stuff you disconnected to change the IAC.

@thedon8082

6 ай бұрын

He is showing how to take off the throttle body as well

@OfficialDangus

5 ай бұрын

Everybody takes off the throttle body. Why risk cross threading a tiny torx screw?

That shit part is 10$ on Amazon bro don’t get oem they’re old asf anyways even aftermarket is as good or better

@andrewcheatle4691

Жыл бұрын

Yup everyone says get Mopar sensors or else the World will End 😆 but I've had great luck with Standard brand sensors and even that's their cheaper range. Haven't tried the Amazon sensors yet but they are dirt cheap & the feedback seems ok so maywell do

Should have went to rock auto 🤣

No... dummy. 700rpm's at an idle. You still have problem's.1000 rpm is wayyy to high.