Jeep XJ - P1391 Rough Idle & Stall Problems Solved! Crankshaft Position Sensor (CPS) Install
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- čas přidán 8. 02. 2023
- Our rough idle & stalling problems (P1391 error code) woes in the Sandbox (1999 Jeep Cherokee XJ) continued to haunt us even after deep cleaning the throttle body & IAC sensor. In this video we tackle the next possible culprit and replace the hard to reach crankshaft position sensor (CPS) in the Jeep. And guess what -problem solved!
#offroading #jeep #jeepxj #rockcrawling #DIY #crankshaft #mopar #errorcode #checkengine #jeepcherokee #jeepcherokeexj
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Thank you both so much. My offroad sleigh has been giving me grief for some time now and I've spent more money than I should have to fix the problem. Santa's going to have to leave something special for both of you under the tree this year. On a side note, Preston's smile in infectious and Mrs. Claus says Preston is "Just the cutest and most precious mechanic she's ever seen."
Thanks! Preston does have a pretty infectious smile and laugh too once you get him chuckling.
I absolutely love you guys. Super cool father/son dynamic, makes me so excited to be a dad and do this with my son. Preston’s gotta be the best shop assistant I’ve ever seen, wish I had him to help me on my XJ! Keep putting out great videos guys, god bless you!
Thank you! That means a lot to us. And yes, we do have some more XJ projects in the works.
You guys are top notch on things.
I love the way you intereact with each other a handicap does not limit these two.
Keep doing this the LORD is showing us what yall can do.
Thank you for the kind words.
I think that is so cool that you let you son help you like that. What a great dad. I try letting my son help me but he always wants to take something else off that don't need to be. Lol. God bless you and your family. Have a great day. 👍
Thanks! When Preston was younger he would wander off with a tool lol.
Just got a 93 Jeep Grand Cherokee thanks for your guyses help
Rock on! There fun jeeps
Good job fellers. Preston now that you know how to do that, you can come do my old 88 XJ. I've already been through the same steps you guys have up to that point. I picked up a new starter this morning because the old one was starting to give up, so I figure might as well to both at the same time. Have fun wheeling guys! Thanks for the videol
Thanks and good luck w/ the starter! We're going to try to hit the trails this weekend if the weather plays nice.
Your sensor is not the same as his . Your 88 has a 2 wire sensor that generates voltage. His is a 3 wire sensor with a reference 5 volt signal .Yours can be adjusted by carefully tapping it closer to the flywheel .You want it over .500 millivolts while cranking .I used to get them over .750 without hitting the flywheel .
wow looked like a job, nice job Preston!
It definitely wasn't the easiest sensor to reach, but the Sandbox goes vroom now so it was worth it!
Hey Preston...I'm Preston too....I have an XJ too..... and I like to keep my hands clean too! ( I don't know if they make the latex gloves small enough for your hands, but that's how I help keep my hands clean...kinda lol!)
LOL! Small world sometimes. I guess owning an XJ and keeping your hands clean is a Preston thing :)
Love Preston's CZcams channel!! So awesome 😊
Thanks!
Well done. Hope that fixes the problem! My 97 ZJ 4L hade the same problem but the fix for me was replacing the pcm with a updated one from pick and pull hope yours is fixed
It's funny you mention that. I actually went to a local pick in pull to see if I could salvage a mopar CPS from an XJ, but the transmission and engine were already gone. Here's to hoping the Duralast brand lasts...at least until the mopar version gets shipped.
Excellent
Ear muff time... i love it. Nice work!
Thanks!
Pc of Napkin in socket to hold bolt in it works to get bolt started with extension!
Now that’s a good trick right there. We’ll need to remember that one.
Have some rough idle issues hopefully it’s my CPS too thanks for the help guys
No problem and good luck!
The original owner cut the harness and spiced it directly to the sensor can you tell me what colors are on the harness right to left ?
Sorry- I just saw this. Went and looked at the harness. The wire color- looking at the wires feeding into the plug with the release tab visible- goes left red, middle black, and right white. Hope that helps.
i have 6 bad crank sensors sitting in a box behind me all because i kept buying the cheep ones. auto zone wanted $80 when their cheapest use to be $12. get a ntk one from rock auto, it really is like the best one you can get.
Oh man, I hope we don’t go through 6 of them- that would not be fun lol. Thanks for the tip on the NTK from rock auto. We’ll keep that in mind if the Duralast one craps out on us because the Mopar one never came.
My CPS went out about 4 years ago and I didn't have much money at the time so went with a Standard brand CPS - even though I was pre warned not to cheap out. Maybe I was lucky but it's been perfect so far. Used standard also for my cam sensor and other parts - no issues so far. I did use NTK for my O2 sensors though...
@@andrewcheatle4691 i might just have terrible luck then. the dealership was only able to get newer styles and all the cheaper ones broke on me within minutes, the part store ones lasted a few month each, but the rock auto ntk made it run smoother than it ever has.
@@andrewcheatle4691 Fingers crossed ours makes it that long!
@@ala1998mc My wife jokes that I have a permanent black cloud hovering over my head raining down back luck on me.
Ive been putting off doing my CPS for like 3 months now. cracked the housing when I rebuilt my trans, ended up JB welding the crack for the time being, but its definitely got some intermittent issues
Intermittent issues can be a bare to figure out sometimes. Good luck w/ the fix!
All my socket extensions... ASSEMBLE! 🤣
HAHAHA! That's funny right there lol
Nice 🙂👍
Thanks 😁
@@sandbox_adventures you're welcome
I’m not misfiring or throwing codes, but when idling hot or cold the tach bounces and idles a little rough. Occasionally I’ll stall out. Did you have a similar rough idle like mine?
That’s how it started and then progressively got worse over the course of a couple months. I don’t think a code popped up until it stalled for the first time.
My '97 does it every once in a while, but turning the ignition on/off 5 times quickly resets it. Computer has to re-learn everything, but it's not too bad.
That’s Interesting. Jeeps sure can be crazy weird at times lol
im just wondering if this solved the idle issue you were having ive been chasing the something ive replaced everything on the throttle body and still have issue with idle but when in gear no high idle
We’ve been issue free since we installed the Crankshaft position sensor. If that didn’t work for us, we were going to look into the Camshaft position sensor next. Hope that helps and good luck!
Do yall have any sandbox stickers
Not currently, but Preston has been saying we should get some.
It’s easier to remove it from the top. Unbolt the fuel like off the intake and get you an 11mm wrench. Takes me 10 minutes.
We'll keep that in mind if the TPS sensor craps out on us!
I guess it worked!
So far so good! We have about a week of drive time in it now and still holding strong ... knock on wood lol
@Sandbox Adventures I've got Mopar sensor in my glove box just incase Lol. I got it before I went on a cross country overland trip just in case
I’ll be doing the same if they ever ship the mopar sensor I ordered lol
Does it still works after you replaced the cps?
My keep is having the same problem.
ive changed my crank sensor, cam sensor, plugs, cap rotor, and im still misfiring and sputtering. gonna try and change o2 sensor but even unplugged nothing changes. im thinking bad PCM. i am getting the same code p1391 after all parts replacements. im also getting a p1698 no ccd trans bus messages (bad tcm?)
Whoa, that sounds super frustrating! I've read in the jeep forums that sometimes aftermarket parts can be faulty and send you down a rabbit hole thinking it is something else b/c you just replaced the part. I'm still waiting on the mopar CPS myself. Hopefully swapping the PCM will get you running. Good luck!
@@sandbox_adventures yeah what's weird is every time i change a part things work then new shit breaks. currently i am sputtering because my battery wont hit the proper voltage. before it was not doing that. i am assuming all the damage these other misfires caused, made the alternator shit the bed. going to try, o2s, alternator, fuel pump, then ive got nothing left but the pcm. i will; try and come back to update yall
Please do! I'm curious to know what the actual culprit was in your misfiring & sputtering.
I had similar problems and replaced plugs, wires, coil, distributer, crank/cam sensor...but only when I replaced the O2 sensors did it cure it. NTK are the ones to go for, good luck 👍
@@andrewcheatle4691 im wondering if its really going to be that easy. Right now she wont even crank over fully. She sputters and spits and pops and battery guage is not going up all the way. seems like everyday its getting worse. Im changing the o2 tomorrow morning. If that fails im gonna try another PCM
I have done 3 so far in my 01 xj 😅
I also have a rough idle that i cant fix, did all i can do and nothing worked so it lives with a rough idle now lol
Oh dang, that would be super frustrating for sure! I was starting to get a little nervous at what the next solution would be if it wasn’t the crankshaft position sensor after messing with the throttle body. I think the camshaft position sensor was next on my list but luckily we didn’t need to go there.
American Cars. I never see these problems on Toyota or Mazda
Sadly sometimes it’s quantity over quality.
Drop the front driveshaft easier to get to
Fingers crossed I won’t need to any time too soon but I’ll keep that in mind the next time I need to squeeze my arm up in there lol
@@sandbox_adventures get a 3in extension with a 6in extension with a stubby rachet and can get the bolts out once I figured the little trick I done it within 10 mins
I hate that part. So difficult to replace. Typical Chrysler. Runs better now
Agreed. Hoping this one at least lasts long enough that I forget how much of a pain it was to reach it.
P1391 doesn't register because it doesn't have a ODBII. 😜
Mind blown lol