Engine cut out / Crank Position Sensor fix - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK Tech Forum

Join Wrangler Forum Today


Like Tree2Likes
  • 1 Post By DannySway
  • 1 Post By rollinrob
Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 11-02-2019, 11:32 PM
Thread Starter
  #1
Newb
 
Join Date: Sep 2019
Location: Canaderp
Posts: 14
Engine cut out / Crank Position Sensor fix

Canadian Jeep. Units in Metric 2013 Wrangler 3.6L Manual



My problem:

Below 2000 RPM, Driving normally and push throttle pedal down.
OR. Engine loaded (going up a hill, or towing small trailer)
Throttle mostly open, or wide open.


Engine cuts out abruptly and then cuts back in (.5 of a
second)


No code or check engine light.


Most recently poor fuel econ. But that could be due to
lower fall temperatures.


The FIX:

Like you, I have tirelessly searched this and other forums.
I have found common problems, and various fixes/pouring money in to the wrong area.

I replaced the Crank Position Sensor. 5 Minutes, $30 and all the problems are seemingly gone.
I went up a hill, bogged the jeep hard (usually this makes the problem very noticeable)
In all sorts of conditions this evening, I could no longer replicate the problem of engine cutting out,
now with the added bonus of better bottom end... Im not sure if its just a butt dyno, or actual results.


Fuel economy will be a longer term report back, as I reset my econ and I just went up a bunch of hills with
my foot in it.





TESTING the New and Old sensor:

I am an electrician, so I decided to electrically test the two sensors.
Pins left to right as indicated in the picture.


New Sensor - P1 - P2 Infinite
P1 - P3 7.5 Mega Ohms
P2 - P3 15.7 Mega Ohms


Old Sensor - P1 - P2 Infinite
P1 - P3 3.5 Mega Ohms
P2 - P3 Infinite <Open circuit>


Now I do not know what the values should be, but there is a large discrepancy between the two.
The old sensor was warm from the engine, which may have made the results different, I will check in the
morning to see if the values have changed.

Attached Thumbnails
Click image for larger version

Name:	CPS - Wrangler.jpg
Views:	13
Size:	220.8 KB
ID:	4183333  
DannySway is offline   Quote
Old 11-02-2019, 11:47 PM
Thread Starter
  #2
Newb
 
Join Date: Sep 2019
Location: Canaderp
Posts: 14
Here is a link on how to find the CPS


DannySway is offline   Quote
Old 11-03-2019, 06:21 AM   #3
Jeeper
 
Dr Obbins's Avatar
 
Join Date: Sep 2015
Location: North Carolina
Posts: 2,137
About 3-4 times a month, my engine cuts out like you described. 13 manual also. I can't recreate it, but it happens when accelerating and mostly when shifting into 3rd gear (below 2000rpm). Never had an issue off road. I'd be interested to read a follow up post confirming this fixed the issue.
__________________
Spending Thousands of Dollars, Countless Hours, Enduring Cuts & Bruises, Then Driving Miles Away From The Nearest Paved Street To Conquer An Obstacle That Can Easily Be Avoided.
Dr Obbins is offline   Quote
Sponsored Links
Advertisement
 
Old 11-03-2019, 11:12 AM
Thread Starter
  #4
Newb
 
Join Date: Sep 2019
Location: Canaderp
Posts: 14
Quote:
Originally Posted by Dr Obbins View Post
About 3-4 times a month, my engine cuts out like you described. 13 manual also. I can't recreate it, but it happens when accelerating and mostly when shifting into 3rd gear (below 2000rpm). Never had an issue off road. I'd be interested to read a follow up post confirming this fixed the issue.
Hey! I didn't want to get too specific with gear selection, but it most commonly happened after shifting in to 3rd gear and trying to accelerate, but it also happened in other gears below 2000 rippems...

I also did not have an issue off road either, because i'm usually going slower, in 4 low, or in higher revs.

I will follow up in a week, after I have driven the Heep more throughly.
Dr Obbins likes this.
DannySway is offline   Quote
Old 11-03-2019, 07:20 PM   #5
Jeeper
 
rollinrob's Avatar
 
Join Date: Mar 2015
Location: Sierra Nevada Gold Country
Posts: 389
Was having the exact same problems on my 2015 with 62,000 miles. 3rd gear up hill passing lanes, would cut out. Lugging in 2nd gear same thing.

All oil galley bolts were found to be loose. That fixed most of the problems. Back to shop, 4 cam phasers and oil control valves.

Almost fixed. Crankshaft position sensor replaced all all is good so far after 200 miles.

The phasers and oil control valves and all labor warranty covered.
rollinrob is offline   Quote
Old 11-04-2019, 08:33 AM   #6
Jeeper
 
cflo's Avatar
 
Join Date: Sep 2017
Location: Newtown Square, PA
Posts: 158
It seems like a lot of Jeep's benefit from replacing the CPS after high miles or several years. I replaced mine and saw similar results. It never threw a code.
__________________
2013 JKUR True Blue, Manual, 4.88 UD60s, ~3.5" lift, Fox 2.0 Res Shocks, 37x13.5x17 Nitto Exograpplers, XD128 Machete Wheels, Hydro Assist, assorted other bits
cflo is offline   Quote
Old 11-06-2019, 07:05 PM
Thread Starter
  #7
Newb
 
Join Date: Sep 2019
Location: Canaderp
Posts: 14
Quote:
Originally Posted by rollinrob View Post
Was having the exact same problems on my 2015 with 62,000 miles. 3rd gear up hill passing lanes, would cut out. Lugging in 2nd gear same thing.

All oil galley bolts were found to be loose. That fixed most of the problems. Back to shop, 4 cam phasers and oil control valves.

Almost fixed. Crankshaft position sensor replaced all all is good so far after 200 miles.

The phasers and oil control valves and all labor warranty covered.
Geeze! Well, I dont have the money for that, so I sure hope its just a simple sensor. I assume that was quite in depth engine work?

Quote:
Originally Posted by cflo View Post
It seems like a lot of Jeep's benefit from replacing the CPS after high miles or several years. I replaced mine and saw similar results. It never threw a code.
Im hoping this thread helps others. I did a lot of digging, and didnt find what I was looking for. Or people were having slightly different issues, with the same underlying problem.
DannySway is offline   Quote
Old 11-07-2019, 10:20 AM   #8
Jeeper
 
rollinrob's Avatar
 
Join Date: Mar 2015
Location: Sierra Nevada Gold Country
Posts: 389
Quote:
Originally Posted by DannySway View Post
Geeze! Well, I dont have the money for that, so I sure hope its just a simple sensor. I assume that was quite in depth engine work?



Im hoping this thread helps others. I did a lot of digging, and didnt find what I was looking for. Or people were having slightly different issues, with the same underlying problem.
If I had to pay I believe most of the cost would be labor. The parts would have cost me about 500 give or take. I would guess labor (In California) would have been 1500 US dollars, not sure because it was all covered.

If i'm not mistaken all parts replaced are accessed by removing the valve covers, cam phasers and oil galley bolts are under them. Not sure if the intake or timing cover needs to come off or not, (I don't think they do).
DannySway likes this.

rollinrob is offline   Quote
Reply

Tags
crank position sensor , engine cut out , engine shudder

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off






All times are GMT -5. The time now is 04:32 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.