Jeep Cherokee: EVAP System Tour; How it Works + Test it Without a Smoke Machine! [‘98-’01 XJ] P0455

[@bollarhide2315]

These jeeps have been around (and no longer made) for at least 21 years and yet we are just now getting these critically informative and well done videos! Thank you for all the information and entertainment!

[@MikeOrazzi]

So true. My 01 is having an issue or two. Well, maybe 5 codes.

[@frankrusso8179]

I just completed and had notarized your nomination for Sainthood. I’m sending it to Heaven via certified mail, just to ensure prompt delivery. Thank you so much! Not only is this video comprehensive and well articulated, it is so professionally done you should be proud! THANK YOU!!!

[@Brogdong]

I appreciate your thorough breakdown. I found the 3" hose attached to the charcoal canister was old & cracked. It cost me $3 to replace & couldn't have been easier. After 1 1/2 years of looking @ my check engine light it's now fixed! THANKS! \m/

[@7jack7]

AMAZING VIDEO!!! I cannot help but think you must do this for a living. You have a professional narrator's voice that is a delight to listen to, and the video portion is so very well done. And the entertainment value stands by itself, as one commenter pointed out. You deserve the thanks of everyone plagued by this problem, and anyone who appreciates a job well done. THANK YOU!!!

[@WAEMIDIV]

This video was a matter of "Fine... I'll do it myself." There's no information out there because most XJ guys don't give half a damn about gas mileage, and think emissions systems are a communist plot to steal their wives I had searched for 2 years on XJ EVAP stuff but just couldn't find anything helpful. One day I was finally fed up with it and decided to research and learn everything there was to know about how the system works, apply that knowledge to the XJ, and then tell the world!

[@WAEMIDIV]

did you watch the video? I don't mean to be rude but the video tells you where to start. P0455 means there's a leak, so you start by narrowing down where it is.

[@daveringler2016]

Awesome video and explanation, my auto/XJ knowledge just increased like 300% in 14 minutes, thank you for video.

[@ironworker5792]

Likewise!

[@MikeOrazzi]

My light burned out it was on so long.

[@daveringler2016]

@@MikeOrazzi pay your electric bill

[@MikeOrazzi]

Don't worry, I've been driving Xjs since 1992, I've been paying. @@daveringler2016

[@ironworker5792]

Priceless education, thank you!! That entire system confused the craps out of me, for years (2 XJ’s) but after a few replays of your epic video (bc I’m stupid), I tested the entire system, finally got it through emission's. It was the tank seal, and the vent to canister. Sending a case of Spotted Cow …

[@RavenRedwood]

Haven't had this code on 01 XJ yet but I'm grateful to have seen this superb video! 👍

[@RonMalo-s1i]

I want to thank you for this superb video. My 2001 XJ has / or rather had , thanks to your video) the P0456 Code - Very small leak. My understanding this is a pin hole size leak and near impossible to find. I sent air through the system, hopefully listen for a leak, (none) then decided to block off the LDP to see if it was the pump. I did and I still had the code. So I thought it must be the pump, so I reluctantly bought a new pump, installed it and after blocking off the pump I still had the code. So it was either a bad (new) pump, unlikely but possible, or the hose. Hose looked good, so I deduced the only place it could leak was at the connection. I placed hose a clamp on the Pump connection side for the hose, and the code went away. I was thrilled. Would never of thought of blocking the LDP in a million years. Couldn't have done this without your video. Again thank you. Your video is the best out there.

[@WAEMIDIV]

@RonMalo-s1i Shame you bought a new LDP, but sounds like the old one still works! I'd keep it. Sometimes, I find them at junkyards for cheap and give them to people. Yours had one of the most annoying leaks... if you think about it, if it didn't have a leak detection pump, it wouldn't have leaked... Chrysler's finest

[@RonMalo-s1i]

@@WAEMIDIV Yea, I was really annoyed with the whole set up. Why have a code for stuff you can't find. The old LDP still works, but its the original, so its pushing 25 years, so I'm ok with the purchase. (XJ only has 145K miles.) Bought the cheapest LDP I could find because I was skeptical. I went to the junkyard looking for hose elbows. Found most of the EVAp stuff had been picked over. Oh well, like you that CEL drives me crazy. So glad you had the solution. Loved your ZJ gas tank swap video. I agree with you, most videos gloss over the most annoying / troublesome parts, or assume people have lifts or welders at their disposal. Many thanks.

[@bulletsnbrains]

Thanks! My '01 XJ is doing this now. Gives me a head start with my diagnostic from your vid.

[@jordanramirez5749]

Best video I've seen on the subject. Been looking for this info . And you get direct to the point. Thanks man 👍

[@memakesmusic4211]

This is amazing, how the hell does this only have 230 views?!

[@WAEMIDIV]

Because nobody cares lol who knows, maybe tomorrow it'll have 231 views!

[@shameite74]

Best EVAP system video I have ever seen! Awesome job!

[@jonathangomez-vv2dh]

I have a P0455 on my WJ. After watching this video I feel more confident in fixing the problem. Thank you for your help!

[@tjlinantud7440]

You deserve so much more credit for this video. Incredible

[@pachinmarin3528]

I LOVE THE WAY YOU EXPLAIN THE XJ EVAP SYSTEM, I HAVE A 2000XJ FOR 8+YEAR'S AN BELIVEME THE EVAP SYSTEM IS TRICKY THE HAYNES MANUAL DON'T GIVE TO MUCH INFORMATION ABOUT IT, Thanks a million!

[@WAEMIDIV]

Absolutely!

[@irishryano]

Thank you for making this high quality and thorough video! The diagram with highlighted parts/section was very helpful Many thanks!!

[@xj_overlander]

Very informative! I don’t even have an evap problem (yet) and still thoroughly enjoyed learning/watching

[@justonemori]

Thanks for the video, I appreciate the graphics. I'm working with my brother's 2000 4.0 auto (federal emissions) that doesn't have a leak detection pump. We installed silicone vacuum hoses good results and the next project is the original fuel pump and evap canister. I'll be sure to add rubber hose to the parts pile so we can get rid of the sketchy looking metal pipe. The Purge solenoid clicks so I assume it's functioning, I may go replace it since it's cheap. Cheers!

[@cameronbur4445]

Outstanding video! Thank you very much.

[@mondomikeg4921]

Great Video! Lots of information and FAR more informative that some of the others I have seen. Although you kind of open up a new can of worms and prioritize things differently from what I have seen I still appreciate your information. Keep up the good work! Best Wishes

[@firstimeshooter6590]

So so helpful thank you so much. Still don’t know what it is but now I know where to look.

[@PlumdogMilli0naire]

I’m excited for the ZJ gas tank vid. Wife just bought an 01 XJ for a weekend toy and she’s wanting to make some upgrades. I didn’t even know this was a thing.

[@WAEMIDIV]

I guess the rest of the internet didn't know either, I'm kinda surprised. I still don't have the tank in yet though lol the tank seal that came with the Delphi pump was not the correct part, and didn't fit properly. I had to wait on a new one which just arrived today

[@coldgarden_]

Love my 2000 Cherokee Sport! Like you I put a ton of time and effort into it to keep it in top shape. Thanks for helping with this! Very well done!

[@aussienj]

Outstanding video. Will definitely use this as a main reference for my 2001 xj.

[@davidanderson2018]

Hey this was great and hope it encourages you to know that this video is still helping others to understand our Jeeps. But this is only for California emissions code which took me a sec to figure out mine is federal which has less to worry about.

[@WAEMIDIV]

Yeah at the time I thought this whole deal was on 98+ XJs, but you're right it's only 00+ California Emissions models that have the entire system. There's hardly any information out there on it so I had to change that

[@ahmadkamali8547]

Exlent n meaning full.. A real professional

[@CK-jb8qh]

Just repeating what everyone else has already said- Amazing quality in this video. Thank you. Subbd liked commented and notified and I don’t do that for anyone

[@WAEMIDIV]

That's the goal! Make videos that actually make sense. Glad I could help

[@joshuavallone8377]

Gasoline evaporates faster then my ex's loyalty 🤣🤣🤣 yes!! I felt that. Great video by the way I subscribed!

[@austinheinen3708]

Thank you now I have a hint on fixing my P0441 code 😊

[@41GarageandGrill]

That was a great video! Thanks for taking the time to explain in so much detail!

[@HobbesVids]

Keep it up man! loving these videos!! i'll have to replace most of the EVAP system on my MJ as well, i may even delete the charcoal canister all together, though i'm not sure still.

[@petemalelis3037]

Best XJ Evap Vid

[@tlctilljcb]

Another well done video.

[@kermitshatley1903]

Well explained, this should help alot of people, excellent job!

[@BruceWayne-vf8ym]

Fantastic video.

[@billcrane2444]

Great video and great information. I don't have any problems, yet. I was trying to locate the fuel filter and found out there's only a strainer inside the gas tank. Since the injectors have never plugged up I guess the strainer is good enough. And, now I know what that square box bolted near the gas tank is....the charcoal canister. Whod'a thunk it??? Thanks again for the great video.

[@justonbohannan]

Well done!

[@JonLarson-z5y]

awesome video! I need to go test this out, since ive been chasing a p0455 for a while now on my XJ.

[@tdtrecordsmusic]

BRO, thnx for the overview !! so many components to check. arg p0456 . stupid smog check.

[@travishart6759]

Hey man. Great Jeep videos keep up the good work. But would you be able to post a link or send me the diagram you have of your EVAP system. If you can I'd greatly appreciate it thank you

[@5443-p1s]

GREAT video, thank you.

[@harvestblades]

I bought a 2000 XJ & while my mpg isn't great running at stick height with 31'10.50" tires I was expecting a bit more as my 5.3 '05 Yukon gets better mileage onnthe hwy. I don't have a check engine light or any codes per my scan tool & just noticed today the two lines to the purge valve have been disconnected for a long time as evident from the think layer of dirt. Pulled up this video to see if that would cause a CEL & am really curious to see if my engine runs better & or mpg improves. Actually popped the hood as I am changing oil, brakes & was hoping to get cruis & AC working so was just looking for anything disconnected or cracked or off vacuum lines as well as anything else & noticed the evap lines. Anyways good video & also why it is a good idea to always have a good look around under the hood & vehicle when doing basic maintenance or a repair as you never know what may need replacement, has been "broken" or what you may find.

[@edwardsanchez6931]

Excellent video buddy

[@garyheutmaker2122]

After completing the heater core replacement the check engine light came on p0441 reinstalling the evap purge valve upside down LOL

[@JamesJohnson-m3b]

Does the 5/16" hose fit directly into the evap cannister? It looks like you spliced it into a larger hose (screenshot at 11:41). I just took off my connector hose from the evap cannister to the metal line (mine isn't rusted through...yet) because it was cracked & leaking but it looked to be one diameter at the metal tube side and a larger one at the cannister side. Thanks.

[@WAEMIDIV]

I think the plastic fitting on the canister is 5/16", and the plastic line where it enters the fuel tank is 1/4", so there may be an adapter in there but it's been so long I don't remember

[@raylanglais8229]

This is great information!! Thanks a lot!!

[@02jericho]

I’d like to see where each evap line connects

[@craighutchinson5045]

XD lol, ur funny. great video, very clear and concise- thanks for the share

[@petertejeda2470]

Do you have a list (or know where I can find) all the part numbers for all the vacuum system elbows? 2001 xj. Awesome video, I subbed immediately after watching how thoroughly you presented the info. I'm impressed.

[@WAEMIDIV]

Unfortunately, most of the EVAP stuff isn't made anymore, so you have two options: you can try a dealership, who might be able to get a certain few pieces, or you can rig up some custom stuff with random bits of emissions rated hose and some clamps. That's what I did, parts stores also sell random assorted fittings that might sometimes work, but otherwise you'll just have to piece together most of it. If you can't find "emissions rated hose", fuel rated hose will also work because it's basically the same thing

[@mealticketscrub2561]

Check Amazon. Dorman sells a full vacuum harness for XJs

[@jaymcguire8492]

thanks

[@8x8snooptracing48hr-mz1do]

This comes that whistling sound when cold or start, when the engine gets got , it develops pressure then all of sudden it shuts off randomly , there is thin small hoses inside under the dashboard may go to the air vents heating system, there will be no code , also the next problem common problem is the heat soak cylinder 1, or 234

[@collin_bowie]

Great info and very well presented. Not sure if you're still answering comments on this vid but I was wondering: assuming the LDP is not faulty and can hold pressure within itself, could you just clear the check engine light, block off the LDP like you did, then take the vehicle in for inspection after all of the internal monitors in the ECU have gone through their checks? Might need to find a more inconspicuous way to block the line but I'm wondering if that would be a temporary workaround to get a sticker. After moving from FL up to NH I don't think my evap leak is going to fly anymore lol

[@WAEMIDIV]

Yeah, I imagine that would work. Most state inspections don't much inspect the vehicle, they just scan the computer for error codes or use a Tailpipe sniffer. The only state I've heard of that actually does thoroughly look through a vehicle is California but I've never been to New Hampshire so they might take a look around. But that's the only thing to be concerned about

[@collin_bowie]

I appreciate the response - I'll give it a go and see what happens. Have learned a lot from your videos over the past couple years keep up the good work!@@WAEMIDIV

[@robertleephillipsiii577]

Hey, could you link a parts list for the EVAP fittings. Having a hard time finding the elbows that connect to the manifold near the mass air flow sensor. Those Dorman variety packs are not big enough or are sized wrong for the application. Great video exactly what I needed to see! 🔥

[@WAEMIDIV]

The trouble with those EVAP Fittings is that they aren't made anymore, I had to use random "universal" ones when I replaced mine. Small fuel-rated hose will work, otherwise you'll either need to get them from a dealer (doubtful) or get creative with some custom parts unfortunately

[@grapeslush]

“for once i’m not talking about my ex.. im talking about the check engine light”😂🤣🤣🤣

[@aflykidfrombrooklyn]

Amazing video! Thank you so much. I am looking to replace that metal line with the rubber hose. I know you mentioned it in the video I was wondering and hoping if you potentially had a video with the install of that and is there a specific part number for that type of hose?

[@WAEMIDIV]

The hose I used was not a specific part, it was just 4 feet of 5/16 fuel rated hose from Autozone. Parts stores usually sell various hoses by foot increments. I used a 1/4 to 5/16 brass adapter to connect it to the fuel tank side, and it fit right on the charcoal canister side. There's nothing much to it, just rip out the metal line and put a rubber line in its place

[@tedchevalier]

@@WAEMIDIV Thank you so much for this tip! I just waited 6 months waiting for a replacement metal hose that never came and this is a fraction of the price. Yessss

[@aflykidfrombrooklyn]

@@WAEMIDIV Thanks a lot. This was a very important video and I appreciate you responding. I have another issue I'm trying to deal with. I have a P1494. Watched multiple videos regarding what people did to resolve the issue. Lucky they just replaced an elbow. I've traced my entire system and smoked it. Only leak I did find while doing that was throttle body. I cleaned and replaced the gasket as thats where it was coming from. The LDP is aprox $150 with the filter but hoping there is a way to verify if it working properly. I did try the nerf ball test but not sure if I did it properly or if it would of showed P1494 or another code. Can you assist?

[@WAEMIDIV]

@@aflykidfrombrooklyn P1494 is set for internal failure of the LDP. You need a new one, you could save some cash by getting one from a junkyard

[@aflykidfrombrooklyn]

I will have to find one here in Brooklyn, New York because I know it’s very difficult to find them

[@nathanhyland910]

So now the question comes as to where does one get the fittings/connector/boots whatever you may call them for the charcoal canister and manifold side, my connections are pretty much dry rotted out

[@WAEMIDIV]

There's not any OEM replacements anymore, even the dealership doesn't carry them. You'll have to get custom cut pieces of vacuum hose that's fuel rated. Sometimes you can find miscellaneous fittings at parts stores that fit. I just have a random assortment of those on mine

[@technical19d34]

If you take this type of parts into most auto parts stores they can usually find something close that may work.

[@ioannisa5084]

Excellent!! Does these apply (partially) to the italian vm diesel engine??

[@WAEMIDIV]

I can't answer that, they never sold that engine here in the United States. It's hard to find information for them, and Diesels operate on different fundamentals than Gasoline cars

[@user-jo2bc9so9y]

Since you have dug into this, do you know what causes TID $51 and $53 low values? I don't have an illuminated CEL and pass emissions. But something seems wrong. For some time, all of these read 0, including $52. But there are no other issues. Now that it is summer $52 passes.

[@johnrepko1133]

Hello were did you buy your new intake manifold? Cause I cracked mine. Ty

[@julianhannush3809]

Amazing video. Question: any harm in me permanently capping that hose you nerfed on the LDP to keep my CEL off? Been chasing leaks for a long time and I still can’t find it.

[@WAEMIDIV]

no harm, I would cap off the other end as well though, as fuel vapors could potentially sneak out of there. But with the test hose blocked, the LDP will never find a leak, so you'll never get a CEL. Excellent way to bypass the system

[@julianhannush3809]

@@WAEMIDIV Done and done. I’ll fix it properly one day ;) You’re a legend.

[@jdmsaywhat]

If you open your fuel cap and the pressure comes out wouldn't you think there is no leak at the tank? If there was a leak there would be no pressure right?

[@WAEMIDIV]

if there's pressure coming from the fuel cap that usually means the EVAP line is clogged, not leaking. Pressure should not be able to build excessively

[@michaelsine1181]

Any insight as to where to start with a p1495 code?

[@WAEMIDIV]

it's either a bad LDP or a shorted wire somewhere leading to the LDP

[@noodlworks]

I've had a '96 XJ for 2 yrs now, and I've NEVER heard my evap purge solenoid make that clicking noise. 🤔

[@ian4serena]

i been working on my 1997 zj evap leak for over a year now i have ran out of ideas and now doing the parts canon. replaced the gas cap 3 times , new filler neck, new fuel pump mopar gasket and lock ring, fuel filler and vent hose too new rubber lines , new LDP and purge valve. Only thing left to try is the charocale canister and LDP filter .i did a home made smoke test and found no leaks after replacing all the lines and fittings but still get the evil P0442 small leak at this point i think i might just take my cel bulb out and give up trying to fit it. on your gas tank did you find where the leak was coming from ?

[@WAEMIDIV]

Yes I took it to a mechanic for them to smoke test, and they found the leak on the fuel pump seal. Take a look at the quality of the rubber fittings on the charcoal canister/ intake manifold

[@jaimeleon3104]

I did the nerf ball method and my ldp if fine didn’t get the code again.. just confused on the next part how do I check the rest of the evap system? Which ones do I plug on the charcoal canister and do I need to plug them all sorry I’m mechanically slow thanks 🙏

[@WAEMIDIV]

Well first, check all of the fittings on the charcoal canister and make sure none of the 3 are cracked or dry rotted. Disconnect the front 2 and plug them on the Canister side, leaving the third, farthest rearward one plugged in, and then drive for a few days. This will test the Canister itself and the line that runs to it

[@jaimeleon3104]

@@WAEMIDIV okay thanks I also replaced the steel line from the gas tank to the canister thank you for replying hopefully I can figure this code out it’s so annoying

[@MrMrsregor]

what if the temps gets hot outside and the fuel tank is getting pressurized due to heat expansion ? can a bad evap purge valve cause the fuel tank to over pressurize ? i read mixed information about if the fuel cap is vented to atmosphere (but believe that it is not and all the venting should be into the evap canister) first i am going to pull the lines off and see if the are clogged. ..

[@WAEMIDIV]

Heat doesn't have anything to do with it, gasoline just evaporates and vapor naturally takes up more space than liquid, so it pressurizes itself ambiently. The gas cap does have a vent on it that's designed to open at a certain threshold as an emergency release, but I don't know what that pressure requirement is A stuck purge valve can indeed cause overpressurization, as can a clog in a line. There are OBD codes for both of those conditions

[@MrMrsregor]

@@WAEMIDIV okay thank you so much for the reply and awesome videos!. (my xj is 1998btw) there is currently NO check engine light on. but i need to get this sorted out. i will try to swap out the purge valve with one from one of my other jeeps and see if that helps. next, i will pull the lines off and blow through them to see if they are clear. the tank is getting way over pressurized so much that it is expanding like a balloon until i open the gas cap. i installed an old gas cap that i had laying around but i am unsure if it is even good... if the purge valve swap doesn't help, and the lines aren't clogged, next i might get a new gas cap. i have another issue that i think is unrelated; The jeep doesn't keep it's fuel primed like it should (i have to cycle the key a few times before it will start) so for this i bought a new fuel check valve and still need to install it. would a bad fuel check valve cause the tank to over pressurize ? or could these problems be related in anyway ?

[@WAEMIDIV]

@MrMrsregor Not all 98s have a full EVAP system, if yours doesn't have the leak detection pump then it won't know how to display errors for alot of the EVAP stuff, which doesn't mean it can't fail, it just has no way of knowing if it does. The fuel priming is unrelated, you will need a fuel pressure regulator, which might be this "check valve" you got (maybe the same part with different names)

[@MrMrsregor]

@@WAEMIDIV oh, yes, i miss spoke, you are correct, the fuel pressure regulator is what i bought.. could a bad fuel pressure regulator effect the tank pressure or just the pressure in the fuel line going to the fuel rail?

[@MrMrsregor]

@@WAEMIDIV oh yea, you are also correct again. My 98 doesn’t have the leak detection pump…

[@elivilla1759]

My 99 xj have nothing of those things, just the charcoal box, are there xjs without this system or the previous owner took it out? My xj have terrible gas mileage btw

[@WAEMIDIV]

In 98+, it's only on XJs with the 50 state emissions package, a factory option that added all of it. Completely normal to see one without it

[@dylanreynolds4899]

I have a 99 xj sport and the evap port on the manifold closest to the front is just open and sucking air. It says on my diagram this port is unused but should I just leave it open or cap it somehow?

[@WAEMIDIV]

There should be a cap on it, you can use whatever you want really, but vacuum caps do exist, they sell a variety pack at autozone

[@dylanreynolds4899]

@@WAEMIDIV ok thanks I have something I can use to cap it

[@kryptogpk841]

i have a 1997 jeep grand cherokee lardeo and i at first got a ignition coil code replaced that didnt fix the stalling issue then hooked a code reader again and got a p1494 for the evap. My cherokee doesnt wanna start and when it does it wants to turn off and i have no clue if i fixed the evap if that would fix the issue

[@WAEMIDIV]

The EVAP system is entirely non-essential for a running engine so I think your problem is somewhere else. I'd replace the spark plugs or distributor components if you had an ignition code

[@kryptogpk841]

It wouldnt start at all. So i messed with the gas cap and then tried it and it crunk up. Its a 1997 grand cherokee laredo not a xj not sure if the systems are the same

[@kryptogpk841]

@@WAEMIDIV after I replaced the ignition coil the code went away then a evap code popped up

[@kryptogpk841]

@@WAEMIDIV could it still be something with the ignition system if the code went away after I changed the coil

[@sesparza5020]

I have a 01 xj with a P0455 code all my lines are good , I’ll give the LDP a test , another problem that I have is that I have a hard time starting the xj, it cranks for about 5 seconds then it starts sometimes it takes longer, then when I drive it around turn it off then try to turn it back on it doesn’t even crank, it dies right away then the second try to start it it tue turns on. Any tips or suggestions on what could be wrong with this money pit? **Btw I have a new fuel pump**

[@WAEMIDIV]

A long crankover can be caused by a handful of things, ranging from simple maintenance-able things like bad Spark plugs or a starter, but could also be clogged fuel injectors, low compression in 1 or more cylinders, or even a dying crankshaft/ camshaft position sensor. I doubt the EVAP code is related to the long crank, and if you can't find the leak you can do a smoke test or experiment like I did in the video

[@sesparza5020]

@@WAEMIDIVI’m back I changed the fuel pump and it starts right away so thats good. So I still have the large leak, I put the smoke machine and there is no leaks, I put a new purge valve, a new charcoal canister, and a new LDP. Any suggestions on what I could be missing?

[@Jsnake513]

Lol i had 3 codes P0441 P1494 P1486 The check engine light went away. Not sure why. I did see the evap was upside down. Besides that ive only changed the hose from top of valve cover to intake. Any idea what it could be? I/M readiness on code reader is skipping the evap now.

[@WAEMIDIV]

P0441 means something is routed wrong. "incorrect purge flow" means some hose, on something, isn't connected to the right thing. P1486 and P1494 are both a result of that first one. If you fixed the LDP being upside down and then the CEL went away, it sounds like you fixed the problem

[@jeffreynolds7974]

The vacuum port on my manifold all the way to the front says it's unused but I noticed there is nothing covering it and it is just sucking air. Is there suppose to be a cap on this or what? I can't find any info about this 3rd line and what to do with it.

[@WAEMIDIV]

Yes on federal emissions models there should be a cap covering that port

[@jeffreynolds7974]

@@WAEMIDIV ok I don't see one to cap it so any suggestions on what I can use to cap this port because right now it is just sucking air in

[@WAEMIDIV]

@@jeffreynolds7974 www.autozone.com/ignition-tune-up-and-routine-maintenance/vacuum-cap/p/dorman-autograde-assorted-vacuum-caps/365550_0_0?cmpid=PLA:US:EN:AD:NL:1000000:FLT:816576617&gclid=CjwKCAjwquWVBhBrEiwAt1KmwnCGo4SItNzSkyw1ctrgydz1v0lRMUOE4FxZaiTr00rZLxSdYzcgyhoC2lYQAvD_BwE&gclsrc=aw.ds There are assorted packs of vacuum line caps out there, but honestly you could just plug it with a good ole piece of duct tape and be fine

[@shrigmaaa]

so I smoke tested it and smoke came out of my Vapor Leak Detection Pump Filter, does this mean my Leak Detection Pump is bad??? Any help would be greatly appreciated, Thanks!!

[@WAEMIDIV]

@shrigmaaa uuhhh... possibly, I've never seen that happen before, but if you also have P0455 it's a safe bet to assume the LDP is failed, especially if smoke didn't come out anywhere else

[@ironworker5792]

Subbed!

[@ianmackenzie686]

Anybody know which of these defects can cause gasoline odours from the jeep when just sitting in the garage? Much obliged!

[@WAEMIDIV]

usually that's a leak from something right on the tank, like the gas cap or the metal line to the charcoal canister, but it can still be leaking from anywhere. I'd replace the gas cap first

[@andresalbertofloresordoric3023]

How to scan the xj 99 with that red scanner, I have the same but never connected Any help?

[@WAEMIDIV]

The OBD-II port is under the dashboard, located right above the hood release.

[@andresalbertofloresordoric3023]

Yeah I know but it never load the info, just remain loading and it reset itself

[@WAEMIDIV]

the key needs to be in the run position, with the engine off

[@patriot72]

I have a 99 Xj. I have a p0441 and p1494 code. I can also get whiffs of gas in the area of the leak detection pump on the passage side firewall. Any ideas?

[@WAEMIDIV]

P1494 and P0441 in tandem with each other confirms a failed Leak Detection Pump. The case might be cracked which would explain the smell of gas near it The LDP air filter may also be clogged, so check that while you're there, but the LDP needs to be replaced

[@patriot72]

@@WAEMIDIV Thank you so much for the fast reply. So to be clear, if the filter is plugged it can cause the fuel smell, and throw the codes? Or the LDP needs to be replaced for sure?

[@WAEMIDIV]

@patriot72 P0441 means "incorrect purge flow" so either the filter is clogged, or there's a leak in the LDP itself. The fact that you also have P1494 (Internal electrical failure of LDP) and can smell gas, tells me the LDP is 100% failed, I'm just saying to check the EVAP filter and make sure that isn't clogged as well. Yanno blow it out with compressed air or something. They do actually still sell those little filters on rockauto too, if you want to replace it

[@patriot72]

@@WAEMIDIV Thank you so much. I will replace the LDP and filter. Was I in any danger of any kind with this issue? Also will this improve gas mileage at all? Sorry for all the questions, it’s just nice to have the help which is what I believe you’re channel is for. That’s why we have our channel as well. 👍

[@WAEMIDIV]

@patriot72 Danger, no not really, unless you have a common issue of people lighting cigarettes in the back left corner of your engine bay specifically Gas mileage yes, because think - you are leaking perfectly usable fuel vapors into the atmosphere, instead of diverting them into the engine where they can be used. So fixing this issue will definitely increase your MPG, but by how much just depends on how badly it's been leaking. It may be so minimal of an increase you don't notice, or you could gain like +2 MPG

[@SpreadTHEKILLER]

So I don’t have a CEL (it’s a 1996), but the damn thing STINKS of fuel when I first fuel up and drive around

[@WAEMIDIV]

96 should have CEL it could be burnt out if there's a fault and it's not on. You can plug in a scanner and read it to see if there's any codes. But 96 doesn't have a LDP, so there likely won't be any EVAP codes

[@SpreadTHEKILLER]

@@WAEMIDIV Oh my bad, I do have a CEL but it’s not related to the EVAP system. I have a P1391 Code even though even though I’ve replaced that sensor multiple times. I was more so concerned with the strong smell of $4.39 a gallon every time I park haha

[@officialWWM]

Wow, that car is rusty…and it looks like you’re heater has a leak too 😂

[@727ads4]

This would have been a really great video but you left out one important key factor you did not mention it all about the rubber hose that runs off the evaporator pump. This hose is shaped like a U and is very common to crack and cause the error code.Most people for a quick fix wrap it with electrical tape.🙃🙃🙃🙃🙃

[@chrischristopher6968]

Well thank goodness for letting us know that. I will sleep so much better now

[@quxqi8326]

What do I do if code PO401 comes up?

[@WAEMIDIV]

I don't think the OBD-II XJs can have P0401, they don't have an EGR system, which is what that fault is for. That's a tough one

[@akkk5517]

Can someone help me with 2.5TD XJ VACUM DIAGRAM

[@petemalelis3037]

Moral of the story, if LDP is working, to pass inspection, Plug the hose coming off of it.

[@ugonnaslide223]

GASOLINE EVAPORATES FASTER THAN MY EX'S LOYALTY 😂

[@WAEMIDIV]

one of the few things that does

[@Texan190]

Anyway we can just delete this entire system?

[@WAEMIDIV]

@Texan190 yeap but it is a federal crime, whether you live in a state that does emissions testing or not. You'll still need a vent from the fuel tank and will always have evap system error codes and worse fuel economy, but it can all be ripped out if you reeeeeeally want to

[@colebuchholz3083]

Can I just remove all of this?

[@WAEMIDIV]

@colebuchholz3083 Yes but you will definitely have negative side effects, you'll need a vent from the gas tank to the atmosphere to prevent the tank from over pressurizing, which also means gas will just evaporate right out of the tank at all times. You will need to cap off the vacuum lines and will always have an error code for the purge valve at the very least, no matter what you do with that, not to mention worse MPG

[@als.688]

So random question but do you think a bad or possibly clogged charcoal canister would make for poor engine performance/bad idle/ crap ride lol I’ve fixed all evap leaks on mine (metal vent line to gas tank) and basically everything when it comes to the damn thing. Stil runs like shit and mpg gettin worse. A lot of things are pointing to charcoal canister (lines were all unplugged on canister, noticed months after I brought it too) My research lead me to your vid and I want to thank you for this info as I know now proper routing and functions of these parts and hope to solve this mystery!!

[@als.688]

Got a 99 xj 4.0

[@WAEMIDIV]

@@als.688 I'm gonna go ahead and say no, the problem is not with the charcoal canister/ evap system. Sure it may be contributing, and will cause a loss of MPG, but I think the bad idle is much more likely caused by something like a clogged fuel injector, a sensor on the throttle body, or potentially something internal like bad lifters. Might even be an O2 sensor. I assume the CEL is on, in which case I would start there and scan the computer to see what error codes it displays. The evap system is not an essential thing on the XJ, and you could even unplug the whole thing from the intake manifold and see if that makes a difference - just plug the hole and start it

[@app4902]

I’ve replaced 3 crank sensors on my Cherokee. I know they fail commonly

[@michaelboyer9429]

OK guys here’s one for you. I don’t have that in my jeep runs I have a 2000 XJ 4.0 from New Mexico no rust and no eve app system

[@WAEMIDIV]

The 2000 models had an option between a 50 state emissions package, or a 49 state package. The 50th state of course being California, all 2000 model year XJs sold in California had to have this EVAP system along with the 2 manifold catalysts. However, 2000 XJs sold in any of the other 49 states came standard without it - it was optional. People refer to these two emissions systems as "California Emissions" (shown in the video) and "Federal Emissions" (what you have). When I made this video, I didn't really understand that. I thought it was commonplace on the 1998+ Cherokees for whatever reason. In 2001, it became standard, so *some* 2000s have it, and *all* 2001s have it.

[@michaelboyer9429]

@@WAEMIDIV thanks I could tell by no screw holes on the frame that it was never there. I just figured that out there in the wild West it didn’t need it. 🤪

[@TheCthtoNicfLy]

I want to ditch the entire system, it's stupid, I can vent my cap ..now I think I can make it's so its running but not connected to the engine

[@clevelandcarpenter8535]

Great video. I always enjoy the ex girlfriend jokes!

[@yayomalu5647]

🤣

[@officialWWM]

You sound a little bitter about your ex bro. Are you getting therapy? 😂

[@WAEMIDIV]

My therapy is youtube thank you for listening to me bro

[@officialWWM]

@@WAEMIDIV anytime 😂

[@jvincent406]

Fantastic video