THROTTLE BODY SENSORS (IAC, TPS, MAP) - Jeep 4.0L

[@opener05]

Great explainer. Thank you! Do you have anything about high idle? I changed the IAC, checked vacuum lines and still nothing.

[@DEInTheGarage]

Did you try cleaning the throttle body? Sometimes the build up on the throttle body or inside the IAC housing will cause a high idle situation. When you checked the vacuum lines, how did you do it? Leaks can be hard to detect and even a small leak (a stretched elbow fitting or hairline crack) can cause a high idle. 4.0's are notorious for vacuum issues. Outside of the easy stuff, check that the wiring on your IAC is all intact. I have heard of cracks in intake manifolds causing idle issues as well. Long story short, high idle can be any number of things, best way to solve it is to spend some time under the hood with a fine toothed comb. Good luck! Hope this helps!

[@opener05]

D&E In The Garage that helps, thank you! I'll check the inside of it on top of the other stuff. Thanks again!

[@seanwaldo9229]

Thx man good vid

[@dragoon9082]

Any tips or tricks to help fight carbon build up or to help prevent it from happening again?

[@donnalynnarmiger6044]

@@seanwaldo9229 I have a 2000 Jeep Grand Cherokee Laredo. I just had the radiator replaced & the first day I had it back it would stall out when I came to a stop. I took it back to garage & it says reset adaptive memory. Could that have fixed it? Now it is stalling out almost immediately. Do you think what you did would help? Thanks!!

[@dashriprock2916]

This is an old video but still helping people . I sure miss a simple carb and distributer .

[@70wolfnipplechips41]

Finally, someone who explains thoroughly, concisely, with enough light to see what he's doing. His calm voice and the lack of distracting music and gimmicks are greatly appreciated. I wish I had found his channel before I wasted so much time. Subscribed!

[@70wolfnipplechips41]

Aw damn! I need you to do more videos. I've been trying to find the crankshaft position sensor on my 2001 XJ for days.

[@DEInTheGarage]

Trying to find it? I can try to do a video on that

[@70wolfnipplechips41]

@@DEInTheGarage I'm sure it would be helpful for many people. My husband took half a day off work, tried to find it for a little, then took it to a mechanic. Wish I could give it up that easy. I get stubborn when I'm trying to figure something out, lol. You do a great job explaining clearly and thoroughly. Keep up the good work!

[@dogbreathmints]

So good to find a thoroughly explanatory expert and this understandable video! What a skill! Thank you!

[@DEInTheGarage]

Glad your enjoyed the vid! Thanks!

[@chrisb6162]

Man, you are a great teacher. You explained everything clearly and the best part is you gave warning to common missteps that dumb shade tree mechanics like me always make. A lot of videos skip supposedly easy steps but when I'm doing repairs on my XJ there is a lot of new territory and I don't even know the basics yet. Your explanations of what the MAP, IAC and TPS do was the best I've seen. I plan on cleaning my throttle body this week or next. Thanks for posting this.

[@stonewallcrippen2237]

Just FYI, you can simply release the latches on the airbox and remove the lid...which will get all the air intake apparatus out of your way. Hope that's helpful

[@agnew82]

Thanks for the tip!

[@107649365]

Screaming it...Stop twisting the intake tube

[@parappa982013]

Literally the best video I've found for my Jeep. Super informative. I'm not really familiar with American vehicles and I always say the throttle body is a great place to start on any vehicle. Absolutely perfect video.

[@DEInTheGarage]

Very true!

[@mavrikdesign4037]

Bro this has had to of been the most helpful video I have found for the nightmare I’m trying to have my wife drive.

[@andrewc.2952]

BRO I'm literally taking my glove off to get to your comment box. Man oh man, you got me through not one but two things I've had holding me up for a whole day in getting my throttle body and IAC sensor off. Dadgum cable #2 was seated in a weird way, so glad I found your video so I didn't break it. Then my IAC was stuck on there bad, I unbolted from the unit but it was still stuck. When you said it should pop off, I got a flathead and sure enough, out it came. I owe you man! 🍺 I have a gorgeous '06 JGCL Ltd. Getting worked done that it's needed for awhile and being able to do it right on my own is just the best feeling ever.

[@agnew82]

My error code is P0505 aka IAC valve issue. My Jeep dies at stoplights, barely made it home recently so cleaning all of these components is critical. 60k miles, 2004 WJ...probably never cleaned! Excellent presentation, incredibly helpful, thank you!

[@MericaUnited]

5yrs later your video is still helping people. Thanks man!

[@ChrisTheAdMan]

Great video! And right on time, too. 98 ZJ here, same engine, bout to replace the MAP but didn't realize about the other sensors. Also, same issue regarding "bad tranny." I'm new to car repair and really appreciate your thorough but plain spoken description of this project. Thanks

[@knighthawk3110]

M.A.P. - Manifold Absolute Pressure 😉 Great video only thing I can add; When working on vehicles, any time you create an opening (such as removing the throttle body) to the engine, it's best practice to cover that opening! Tape, clean rags, whatever works best for the situation. Keep calm and Jeep on!

[@micquelw3709]

Amazing!!! My truck is at the dealership now and they are saying it will cost $1400 to repair the throttle body. I think even a girl like me can do it...thanks a bunch!

[@DEInTheGarage]

Dang... that is a boat load! Good luck DIYing it!

[@chanakyasinha8046]

1400$ 😂😂

[@antigen4]

STAY THE HECK AWAY FROM DEALERS!! horrible ... when i first got my XJ i took it to the deal for new shocks and a 'tune up' ...when you hear that expression - RUN FAR AWAY!!! $1400. that experience motivated me to do EVERYTHING myself from that point forward

[@toastyxtoffy9165]

Glad to know that I won't be the first and hopefully not the last girl to attempt this as well. Way2go sis

[@freedomseeker1966]

Sounds like a good deal if they’re changing the headlight fluid also 🤪

[@YugoGV]

Thanks for the video, my GC 2004 had codes P 0122 & 0123, watched this video like a week ago. Today I removed TB, cleaned it, replace IAC and TPS...all codes disappeared and running nice! The TPS just broke when I removed the connector. You just saved me $50 - $60 in labor!! Thanks a lot.

[@DEInTheGarage]

Glad to hear it! That was the point here. Glad it worked for you

[@shoreline780]

I never knew?! I had no idea I should clean the throttebody. I stumbled across your video as I was kooking for info on the throttlebody for my XJ.You explained everything very well and easy to understand.Thanks very much!! Keep up the great work!!

[@DEInTheGarage]

Thanks! Glad you enjoyed the vid!

[@nathanmccumber8965]

​@@DEInTheGarageI recharge my a/c still blowing hot air I think vent door stuck but heat blows through the vent not a/c.

[@ralphnabozny8494]

wow you are experienced on jeep. my 92 just got its 1st carb clean today. left it on. may be 20 seconds in and out. Thanks; I'v been muddeling through; 3 days now. approach and avoidance.

[@tblack4428]

I have a 1994 Jeep Grand Cherokee with a 5.2 L V8 and am replacing my IAC soon (engine randomly stalls). I appreciate your explanation of all of the sensors connected to the throttle housing and what they do and what symptom problems each one may exhibit when they start to fail. I will be pulling my throttle housing off of my engine to do a thorough cleaning as you had suggested to get all of the carbon deposits off of the throttle housing for a better running engine. P.S. I also suggest having one of those long retractors tools handy when working on this area as I initially dropped a cleaning pad down into the throttle housing body and had to walk to the auto supply store to get one to retrieve that cleaning pad. Live and learn.

[@DEInTheGarage]

Good luck with the new IAC. Hope it fixes your issue

[@dizzywillow2162]

thanks, great video! i have a 98 TJ with a stalling problem. I called every Jeep dealer within 100 miles and not one of them will even look at it. they all say they don't have the equipment to diagnose a TJ! I called Picayune, Slidell, New Orleans, Gulfport, Biloxi, and Hattiesburg. Guess I am on my own with this thing so will start with the throttle body and associated sensors. I will be viewing this video repeatedly for sure!

[@DEInTheGarage]

I cant believe they said that! Hit up JeepForum. Those guys know everything

[@kyle5555]

wow. :-o i was shocked when your hood actually opened and stayed open with the struts.

[@DEInTheGarage]

I have owned several WJs and learned that the first bit of cash you should throw at a used WJ is the $40 on new gas struts for the hood.. you are gonna be spending enough time under there :-P

[@willfreethemfreethem7671]

Mine still works 04 grand Cherokee Laredo 4x4

[@radciff2281]

I just use locking vice grips 😭😭

[@stevenm7566]

Can you put gas struts on an XJ?

[@MikeSmith-fq5dv]

My 04 is the same way. That must be pretty common

[@macheteafilao13]

D&E In The Garage thanks for posting this video bro! I just swapped out the tps in my wj & it’s shifting much better now. I was thinking my transmission was going bad but I saw this video & it fixed the problem.

[@DEInTheGarage]

Hell yea!! Glad this helped you

[@donlum9128]

The 2002 4L WJ(wife jeep) 150k miles idled very rough was hard to start. I replaced plugs, fuel filter, & coil pack still had same issues. Next day replaced crankcase vent hoses, and the manifold vacuum hoses. All old hoses were cracked. Fixed rough idle and stalling but still hard to start, runs good once started. Found out the new Auto Zone fuel filter didn't have a regulator. Replaced with Advanced Auto filter. Used anti seize on the 4 throttle body bolts. I always use Anti-seize. Runs good.

[@JLuxie]

Dude, Thanks so much from Australia. I bought an 04 WJ with 116000kms (70000miles) on it and she threw code P0123 at me yesterday, was just gonna replace the TPS but i think ill clean the entire throttle body now. Only downside is that parts here are a little more expensive, 155aud for the TPS. Love your work.

[@DEInTheGarage]

Good luck! Glad the video was some help

[@540YGO]

I know this is an old video but man this video helped me out so much. I was having some random stalling and taking a bit to start back up and I was at a lost. I replaced my PCM bc it was randomly not getting power to the fuel pump and it seems to run slightly better but now I'm thinking highly about the IAC. Thank you so much man

[@nathanmccumber8965]

Where is the pcm at ?

[@lilcheetah28]

Thanks, good video. The mechanic charged me to diagnose $250 and said, "we don't know what is wrong." "It might be the MAP sensor." They first said the tranny. I changed the map sensor. Didn't fix it. I am going to go pick up the TPS and the IAC.

[@innergoof19]

Great video and info, thx! My 1996 grand cherokee is having shifting problems and this video helped me understand the parts. Now when I go to my mechanic, I'll have some ideas to share with them.

[@DEInTheGarage]

Check that TPS. It is a HUGE weak point for the Jeeps with the fuel injected 4.0. Good luck!

[@garyd.7294]

Thanks Bud, haven't reached out in years. I've got another 01 grand. Core 4×4/ 2.5 coil lift, adjustable trac bar, everything underneath. My idle started increasing to about 1000 rpm's out the blue. Thank s for the video as old as it is. I know the problem.

[@clintonbuckingham5239]

You had a great explanation on this. Have you ever disconnected the sensor separately to diagnose? my 96 Cherokee classic will only run 10 -15 minutes primarily in hotter weather and just dies at all rpm (idle or going hwy). No noticeable trans issues at all. TPS only removed has high idle then dies. all 3 removed high idle then dies. MAP only idles good but did not have the time tonight to let run more then 10 minutes. All sensors look original with a 200k miles but not sure. Dont have the money to replace all, since i have already did a toon-up with fuel filter, new gas, spark&wires, battery & air filter. it does have a cracked manifold pipe but has had it for the last year and just started the dyeing with this new season? any suggestions?

[@vickirichardt1885]

I love this video. I love how you go into detail and you show how to unplug the sensor. So thanks great video...

[@DEInTheGarage]

Thanks for the feedback! glad you enjoyed it.

[@jct19122]

Thank you very much I have a 08 jeep commander and I am having issues. You video has clarified some issues that I had before such as getting to know all the sensors. You've made it very simple to understand.

[@DEInTheGarage]

Thanks. glad you found it useful

[@richardschieffer4518]

Thanks for not pretending to know-it-all. You already know A LOT! Does not having the wire through the accordian hose mean that I don't have a Mass Air Flow Sensor on my 1999 Grand Cherokee 4.0L? I have been getting intermitant engine cut out while driving down the road. Some folks attribute that to the MAFS. I bought it with 60K miles on it and put another 145K on it. The rear driver window started opening whenever it felt like it. I installed a salvaged Body Control Module and it still does it. My next guess is the window control inside that door. Any other suggestions? I am glad you like making these videos. Please continue!

[@shiella2012]

Thanks for your time. Your way of explaining is spot on! On my list 9f Spring Jeep projects! Cheers!

[@nathanaelkolb4024]

Great video! Very clear and concise. I'm having random stalls, no warning. Almost like key was turn off. Always restarts and otherwise run good. Going to clean these parts.

[@DEInTheGarage]

Good luck! Let us know how you make out

[@joshuakalaniparks9084]

Same here with me... It runs perfectly fine otherwise, but stalls out when idling. My idle has been low, about 500rpm, and I think it's about 700 normally. Anyway, it sucks! I wish I could just adjust a screw to raise my idle rpm! Have a great day, I hope your able to fix your vehicle.

[@nathanaelkolb4024]

Turned out that an O2 sensor wire was dragging on the drive shaft and was shorting out. It eventually burned out the fuse that controls accident gas shutoff system.

[@selene10151991]

Very explanatory!! Helps a bunch. Almost blew $500 on several parts I thought it would be. But I always am looking for videos like this to help me explore my Jeep more. 😀😊👏👍👍 Lol

[@DEInTheGarage]

Glad it helped. Thanks for the feedback!

[@abelc5155]

Thanks Bro! Very detailed directions, please keep doing these Jeep videos. My Lisa sure needs the help. Thank You

[@bigdogbrown8106]

Great video&instructions.. I recently got a 88 XJ that runs fine sitting,soon as I pull off,it sputters like it's not getting gas, or to much gas/air.Will change fuel filter&check out everything you mentioned. Thanks!

[@DEInTheGarage]

Good luck!

[@rc9266]

Thanks Great Video! 6mo with 97xj ! Woo Hoo! Anyway Flushed cooling system then the misfires began making me crazy the put put. Did a in place rebuild, replaced Cylinder head with a 7120 new plugs, wires, h2o pump ran great till the other day. JY trip on Saturday. I 'll be a fixin!

[@leeman21]

Observation. Just remove the air filter cover for more room. 4 clamps :( also, when removing the throttle body cables, make sure you show exactly how to remove them. I thought i could just "pop" off the cruise control cable. Well, I broke the the plastic piece. Try replacing that :( I had to get one made with a 3d printer. Instead, you need to 'slide' it off the cable. I ended up super gluing it back together but it was definitely a problem that could have be avoided. Anyway, just trying to give some advice to someone who may have this problem. Cheers

[@DEInTheGarage]

Yep, I watch this video now and cringe that I didn't think to pop the entire air box assembly off. It is hard to watch. Haha. You are absolutely correct about that and the throttle cables. Thanks for the feedback

[@maryholtz2185]

Amazing mechanic so wish you were in mich. to call and pick your brain ,my best friend just passed away and he was such a blessing with helping car problems 😢😢

[@mrkultra1655]

Right on. When cleaning the IAC housing once it’s removed from the throttle body, what have you resealed it with. According to my guys at the local Dodge dealer parts department, a gasket for that was never offered.

[@joebrito2066]

Great video dude. I’ll be doing my XJ this weekend

[@10richfg]

My TJ takes along crank to start and sometimes two cranks, I changed the pump, cleaned the injectors replaced the spark plugs and still the same problem, I'll appreciate an advice, thanks great video !!

[@DEInTheGarage]

Hmm... I assume you dont have any Check engine lights? You can try disconnecting these sensors one at a time to see if there is any chance./ When they are disconnected the ECU (obviously) cannot read them a reverts to a standard setting. if you disconnect on and your long crank goes away, that sensor needs to be changed. FYI, disconnecting these WILL throw check engine codes, but they can be cleared ant they will not come back. feel free to email me if you want to chat more about this issue [e-mail]

[@zippaman100]

Accurate 4.0 knowledge. Always in fashion.

[@laserXperience]

Omg thank you so much for this. The other day my jeep stalled and felt like my trans was slipping and my idle is crazy I was pricing out things in my mind

[@DEInTheGarage]

Glad this helped! Thanks for the feedback.

[@aaronmartinez3177]

Thank you mine just went out and I was driving and it wouldn’t shift, I thought my transmission took a crap too lol but you’ve explained everything so now I know! Appreciate the explanations!

[@DEInTheGarage]

Absolutely. Good luck with it!

[@adamhpope]

this is exactly my issue from 3rd to 4th! sometimes just kick it to 4000rpm to push it into 4. was yours giving a code?

[@bdub843]

Thanks man. Was just going to clean the TB but now I think I need a new TPS. Sometimes I have a little trouble getting between 4th + 5th when I get on the freeway.

[@DEInTheGarage]

I would give that a try for sure

[@JackHenryKraven]

D&E, you are the best. Thank you for every video you've made concerning the Jeep 4.0...:)

[@DEInTheGarage]

Glad you enjoy them!

[@JackHenryKraven]

@@DEInTheGarage I'm going to replace all three of those sensors, especially the one that affects the transmission..:)

[@351cleavland]

I got know my throttle body finally! His name is Phil, he LOVES air and his favorite letter is "O."

[@onefastcyclist]

Thanks for the great explanation on the throttle body sensors! BTW, with a rough idle I was prepared to remove the Idle sensor, but discovered that the hose clamp securing the filtered air passage to the throttle body had worked loose. Perhaps the K&N air filter aggravated this issue, but it's now another item to frequently check.

[@Gunmetalbluejeeptjs]

Thank you I didn’t know much about the IAC and map sensor , I have a 98 tj 3sp auto , sometimes gets a jerking or bucking in the throttle so I’ve replaced the tps and cps with hv wells sensors but still going to inspect my distributor ect , but never check the iac and map so now I will

[@NotOfThisGod1]

Thank you so much, best tutorial I have come across for this subject matter. Extremely helpful.

[@DEInTheGarage]

Thanks! Glad you found it useful

[@ottothom]

Very helpful and cheap fix. I’m having a lot of the issues you’re talking about as systems on the new Jeep I bought. I thought these were transmission related. I haven’t checked the throttle body but I have a feeling this will help with my P0171 code I’m running and my idling and shifting issues.

[@DEInTheGarage]

Good luck!

[@OfficialDangus]

Perfect explanation of the air intake. Im currently dealing with a strange problem on a 2000 Jeep Grand Cherokee Loredo. I replaced the crankshaft position sensor in the fall, in the hopes it would solve a strange "shuddering" and stalling, particularly after the car was run for a while and THEN restarted. Like when you go to the store and come out. So I replaced the tps and the cam shaft position sensor. I'm wondering if while putting in the tps, I created a vacuum leak at one of the rubber boots. That, or when I attached one of these sensors I didn't align it properly...also the evap purge solenoid is clicking like a metronome (normal?). I have yet to do another throttle body cleaning (although I did it 6 months ago), or install a new idle air control valve, but I have a new one and am going to attempt install and hope all of it works.

[@ryanellis5902]

@DangusMcShwangus Did you figure anything out about the purge solenoid clicking..? Mine does the same thing occasionally.. I recently cleaned the throttle body and replaced IAC/TPS bur didn't touch the MAP. (The solenoid has done the clicking both before and after serving the TB.) I don't get any stalling or high idling, but It does seem like the engine "stumbles" a bit during idle. I also just changed out my spark plugs, wires and cap/rotor on distributor. Thanks in advance for any info!

[@Chilling-b9z]

Hello, I got a P0122 code, so I changed my TPS, but my 2004 jeep Rubicon is still hard to start. I also changed my spark plugs and that didn't help. I wonder if I should change the IAC next. I will look at the wires and ground today.

[@scottleachman9847]

That was best explanation I've ever heard

[@sneakthief5724]

This is an amazing explanation! You should do a video on Jeep transfer cases

[@jeffro4kag206]

I went through some puddles, and my 96 Grand Cherokee started missing and wouldn't idle. At first I thought it might be the distributor cap and wires are old. I cleaned the throttle body, and took off the IAC. Cleaned it. Jeep ran great, but then cut off. Restarted but missed real bad. I have some clamps on computer because the 3 plugs were not making a good connection. I guess I'll take throttle body completely off and do what you did in this video. I'm 400 miles away from 300 thousand. I love Jeeps and want to keep it going.

[@DEInTheGarage]

300k?! That is nuts! I would definitely check the TPS if you were in water before it went south. Good luck!

[@strengthcoachsam]

Thanks man! I learned a lot from this video! Changed out my TPS on my own (this is a big frickin deal as I'm not prone to being mechanically inclined) and hopefully that fixed the stalling and lurching problem. I drove it for a while last night and it didn't do it, but the real test will be this morning after sitting all night!

[@simonfortune7279]

Did it fix your problem?

[@marinellahobbyfarm-manongb4891]

Did it fix it

[@strengthcoachsam]

It did not 🫤

[@marinellahobbyfarm-manongb4891]

@@strengthcoachsam fu*ck my dog, same thing is happening to my jeep

[@GregoryM504]

Has it been fixed? If so, how?

[@thundermage13]

Great video! Thanks. I'm tracking down an issue of rough idling when I let off the gas. Maybe this'll help.

[@joshuakalaniparks9084]

What do you think about using gas to clean it? Gas in a spray bottle?

[@DEInTheGarage]

That would work as well

[@scotthatcher7090]

Thank you! Very informative my new Jeep owning daughter.

[@robertchapman455]

Good explanations on Throttle Body

[@rollinamerica]

Great video. Wouldn't happen to know the part number foe the gasket that goes between the IAC housing and the throttle body would you? Mine broke when I took it apart. Thanks

[@laine9450]

At 1:29, taking off the PCV wouldn't make it run rough, would it? Pretty sure that just burns off a little bit of extra oil and thats why it goes in air manifold

[@jimmyskatevids7791]

My jeeps check engine light is on throwing DTC P0122 throttle position sensor. Symptoms are low idiling and stalling when comming to a stop it usual Idols around 600rpm when starting. I’m gona clean the butterfly out and check the IAC sensor. Along with checking the other sensors. Great video thanks man

[@DEInTheGarage]

Good luck! Those throttle position sensors are absolutely notorious on the 4.0. They go all the time and cause havoc. good news is it is an easy fix

[@Coolbreeze1911]

Very enlightening I'll do this on my 04 wj at 212mi thanks Doug

[@DEInTheGarage]

It will probably help a bunch! Good luck!

[@codywalker8695]

What do you think of throttle body spacers Doug?

[@1americanfrmsocal529]

Can you explain what the benefits were putting on the throttle body?

[@340jd]

Great video, thank you. With the TPS when reassembling can it only go in one way? As in the TPS has to be "timed" correctly with the butterfly shaft. Thanks

[@AlexTM44]

My 93 Cherokee sport 4.0L, won't start in raining or cold days, the ignition code I got from the turn on off 6× was 125155, but I couldn't find much about it, 12 I know, I had disconnected the "new" battery, to clean all possible grounds, but I don't know what the 51 is for.

[@DEInTheGarage]

I will be honest with you, I have limited experience diagnosing OBD I jeeps by codes. I would highly suggest you get on Jeep forum and post that sequence. Someone on there will have an answer for you in an hour. Those guys are awesome

[@AlexTM44]

@@DEInTheGarage Oh, thanks for the quick reply. Yeah, I saw a reply on some Jeep forum (I don't recall the specific forum) anyway, the reply was for someone having the same problem I'm having, the person said that the 51 code was related to vacuum "lines"? They said something about the engine running lean? I didn't get it through, as I don't have much knowledge about this specific things. You won't believe how many people have this same type of problem, where the Jeep won't start during and a few hours after a rainy or cold day, until the sun comes out, and supposedly warm up or dry up the vehicle. In my mind, it must be some sensor getting moisture, but I can't figure out which one. Anyway, thanks for the video and the quick reply, you're doing a great job, that will help a lot of people, thank you.

[@TheNiteNinja19]

Mine just kicked back a P0123 and P0121, and won't go into overdrive. At least my Jeep tells me my TPS is acting up. Happened after a carwash. However my cruise control goes out for a day or two after a wash, I'm thinking a wiring problem, but who knows. I'm gonna give it a good looking over when I change the TPS.

[@iLLbReaD]

Thanks man. I had a TPS code pop up when I went to smog my TJ. I'm going to clean the throttle body and replace TPS sensor. Video def helps.

[@DEInTheGarage]

good luck!

[@d.s.2519]

Have you tried using dielectric grease to help keep the water out of your sensor plugs?

[@DEInTheGarage]

It works to a point. Good suggestion

[@khross73]

Great video. I have a 2000 Wrangler that idles kinda rough and when you put it in drive or reverse with the break on it is rough as well, almost seems like its pushing too hard against the brake. Put in neutral and it smooths out or when you drive it seems ok. I bought an IAC and TPS for it. Taking the throttle body off definitely seems like the easiest way to replace the sensors.

[@DEInTheGarage]

Yea, it definitely is. Good luck with it!

[@khross73]

@@DEInTheGarage I went and had the codes read again and its showing P0172(running rich). The guy I bought the jeep from replaced the IAC and TPS before I bought it. I'm googling but if you have an suggestions from past experiences I'd love to hear them. Thanks!

[@DEInTheGarage]

@@khross73 I would definitely confirm that everything on my throttle body was clean. IAC and TPS should not effect mixture, but the MAP sensor could if it was faulty or the rubber hose which connects it to the TB was ripped or missing. Usually a rich/lean situation end up being tied to an O2 sensor. I would definitely check the rubber hose on the MAP as there is no code specifically for the MAP, it just makes the engine throw other codes like running rich

[@khross73]

@@DEInTheGarage will do. Really appreciate your help

[@khross73]

@@DEInTheGarage Well, changed all 3 sensors, cleaned the throttle body, and checked the map sensor hose. I've seen no change in behaviour. Back to the drawing board :(

[@hubertschwarzer3321]

Thank you very much. Your video helped me to clean the throttle body of my 4.0 Grand Cherokee 2000 and exchange the IOC-Sensor: idle speed is great again. I noted that the screws attaching the position sensor are stucked, I dont want to break anything there. Any ideas on how to get them loose?

[@fernandochavez9242]

Any idea why manifold exhaust will turn red hot.94 4.0 grand Cherokee 4x4 muffler shop said it wasn't catalytic converter

[@DEInTheGarage]

Hmm.. in my experience that is only going to happen when there is an obstruction in the exhaust. Is the Jeep running normal otherwise?

[@fernandochavez9242]

Yes .noticed it when I was working on it late so I replaced fuel injectors wrapped with heat shield.

[@ViperGibson]

I have the shifting problem that you mentioned with the TPS sensor mainly happens when going up hills and sometimes from a dead stop, a friend told me he had the same shifting problems, he replaced the TPS and he was fine, so I replaced the TPS in my jeep and I still have the same problem, what do you think might else be wrong? (96 ZJ 5.2)

[@DEInTheGarage]

Is the fuid clean and at the proper level?

[@ViperGibson]

@@DEInTheGarage Yeah that's the first thing I checked when the symptoms started, fluid still looks brand new and it's at the full line, Jeep only has 115xxx on it, after watching this video, and I drove the Jeep today it does bog down some when I'm stopping like it's about to stall, could the IAC with the TPS have something to do with it? I haven't pulled the IAC to check it yet.

[@marcorubio3496]

Good stuff. I been think of taking off my throttle body to clean it. My idle never been great even after replacing the IAC.

[@DEInTheGarage]

A good cleaning certainly never hurts

[@mcguireskaratetheartofsurv1942]

Pros and cons on the jeep Cherokee xj vs the Jeep Grand Cherokee wj Driving around town ,freeway driving ,off road . Which is a better shtf vehicle

[@shitboxoffroad]

TPS was intermittently dying and i thought i had trans issues but i replaced now im running great! 231k miles on a 2000 4.0 grand cherokee

[@christiangonzales5380]

Great video dude I change the fuel pump car worked fine then a day after the truck started idling...only after the car heats up to its level then shuts what can it be thank you

[@DEInTheGarage]

So it idles fine when cold, but shuts down as soon as it reaches operating temp?

[@christiangonzales5380]

D&E In The Garage yes actually I check the fuel pressure it was the fuel pump it was a bad one.as well now it works fine , you should make a video on suspension care

[@BustMonk]

My guess would be the CPS (crankshaft position sensor). I had the same issue... Does it start right back up or do you need to wait a little while? Could also be vapor locking of the fuel rail...

[@thewes4743]

Most helpful video I’ve watched so far! Thanks

[@DEInTheGarage]

Thanks for the feedback! Glad you like it

[@sharlotteseiber375]

Good job, do you have to reset check engine light?

[@Mrfreshpoptarts]

Thanks for Sharing your experience. Very informative 👍

[@theguy2605]

You think you can make one on how to troubleshoot a p 1682 code. I looked it up and im a noob with all this stuff so i was wondering if you can make a video explaining that

[@jablescobra2573]

Very helpful. Just ordered new sensors. Thanks.

[@DEInTheGarage]

Good luck!

[@theUltimateLord]

I have a hose just hanging in my engine bay but I can't figure out where it goes?.... And I have a rough idle when I get gas.

[@johnbryant4742]

I’m experiencing similar problems...will a bad tps cause a backfire under load?

[@DEInTheGarage]

It shouldnt... that COULD be bad crank position or cam position sensor. any check engine lights?

[@johnbryant4742]

@@DEInTheGarage no check engine lights, no codes, no nothing. What got me during your video is when you said that the tps could cause what feels like a trans concern. This is what I’m feeling but not in the way you explain...instead of surging it boggs down in that dead range you talked about. It gets caught in the dead range and I can’t step on the gas to make it go. It never dies but it does sputter and chug like it’s not getting fuel. At first I thought it was a bad coil. Removed it and cleaned it up and it looked good. So I changed the plugs and fuel filter for good measure. Still experiencing the problem. I thought maybe the fuel pump or sender is weak but checked it and it’s good. Then I ran across your video. Turns out that it was the tps. R&r old sensor and BOOM it’s working. It took a day or two for the computer to relearn the new sensor but now she up and running like she was before. Thanks bro. You can tell that you work on your own vehicle and not just out to make a video and put it on KZbin. I like learning from guys like you. You explain things very well. Thanks buddy.

[@acornest123]

Hey so I loved the video I have a 4.0 2001 stuck in high idle at about 5 rpms after taking out and putting intake back in from fixing a freeze plug everything hooked back up correctly but I start it and dont even have foot on gas pedal and it's at 5 rpms over revving the engine what do you think would be the main cause or at least a ruff idea any response asap would be great trying to get this thing on the road

[@Furlong157]

My jeep is idling super low around 100-100 rpm. I replaced all the sensors and it’s still doing it. Any tips. I feel like the only thing I haven’t replace is fuel injectors. But everything else fuel and sensors and plugs and wires cap rotor. Don’t see a vacuum leak

[@racyfreeman317]

The air box on top of the throttle body also has a 10mm bolt on the left side holding it down...

[@may132005]

Just noticed my 2002 wj rpm spikes to 5000 before it would shift. Not always, usually when going up the hill and pushing little harder. Wandering if that my be throttle position sensor issue?

[@jedidias7091]

Do you need to unplug the battery ?

[@williamm-lb3ml]

Great explanation of symptoms

[@matthewtwright84]

Had my throttle body off and cleaned it while I have been diagnosing the issue on my jeep, it was disgusting inside. Thought it was weird when I was cleaning it that there was no gasket. I put it on real quick this morning but I guess I need to pull it off again and use a gasket

[@57jross]

Great job very informative and to the point. Thank You.

[@kevincoquiicoquii7256]

Literally the last thing I would of thought of. Thanks

[@DEInTheGarage]

Good luck!

[@ncee9370]

I'll occasionally start up my Jeep and it will start up fine but will just die unless I keep my foot on the pedal. The second I let my foot off the gas, it just dies. To restart, I'll have to give it some gas to start and again, keep foot on the pedal a bit. Most of the time it'll be fine after a few moments and I can take my foot off and it'll be fine. This happens maybe a few times a year so not often. I replaced the IAC, still happened afterwards. Looking online, some places are mentioning the TPS. Does that sound probable to you?

[@trailwolfzj9762]

Kools.. do u have to unhook the battery when u take off the sensors

[@DEInTheGarage]

I "right" answer is "yes"

[@laragreene8328]

GREAT VIDEO...exactly what I was looking for!! 👍

[@edreiguerrero1817]

Great video. I learn a lot!!!. Question, i was at a stop when my xj start to idle up and down and after maybe like 10 sec. It just die started up again and die again. There is times where it runs like nothing but there is times where it does the same thing. Any idea what it is?

[@DEInTheGarage]

It certainly sounds like your IAC or TPS could be messing with you. Could also be a fuel delivery issue or even a spark plug issue. Do you have the ability to find a junk yard to pull some new sensors to test the theory? If you find the right yard, they should be $5 each