I’m so damn tired of this shutting down problem

Reply Subscribe

Thread Tools

Search this Thread

Oct 26, 2019 | 07:30 PM

#16

BlueRidgeMark

CF Veteran

Joined: May 2012

Posts: 7,965

Likes: 964

From: Lost in the wilds of Virginia

Year: 1998 Classic (I'll get it running soon....) and 02 Grand

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by dave1123

In my experience, a failing CPS won't set a code, unless it has failed completely. I.

Quote:

Originally Posted by TrailerTrash

This is good stuff here. I have known multiple with a 4.0 jeep for many years and nobody has ever mentioned a CPS throwing a code

Agreed. I have had 2 XJs and a WJ puke a CPS, and no code was ever thrown. The WJ would jsut randomly die, as the OP describes. Then it would start right up again.

Until it didn't.

Quote:

Originally Posted by 01JEEP_SEA

One thing I learned is if the CPS is bad The RPM gauge won’t move when cranking the engine. I had a bad CPS with an intermittent start problem

No codes, and never saw a problem with the tachometer. (I"m assuming that;s what you meant by "RPM gauge".)

Oct 27, 2019 | 01:10 AM

#17

awg

CF Veteran

Joined: Mar 2016

Posts: 3,816

Likes: 725

Year: 96

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Landonnyethecherokeeguy

it’ll drive for a good distance then it’ll shut down and show a check engine light but it’ll turn back on just fine . I’ve changed the CPS ,.

given the Crank Sensor can fail without a code, imo it would be helpful to establish what code is actually being generated, assuming the engine check light is illuminating,
be a shame to keep changing crank sensors when the problem was the cam sensor for instance

Oct 27, 2019 | 10:22 AM

#18

Noah911

Banned

Joined: Feb 2019

Posts: 1,359

Likes: 169

From: NC

Year: 2004

Model: Grand Cherokee (WJ)

Engine: 4.0

Quote:

Originally Posted by BlueRidgeMark

Start by cleaning your grounds.

See Cruiser54.com

And that CPS..... If it was not NGK/NTK, it's probably your problem.

But check your grounds.

It might have a new good working cps in it now? The odds of that are actually pretty good, since it was replaced. Something could be wrong shorting the cps connection somewhere, to keep in mind? Also, aftermarket cps sensors have a lot of problems with them. I will only reccomend to use a Mopar branded one for a cps sensor when/if it needs replacing.

It seems like starting at the most basic principles fundamental for operation is maybe the way to go? I would begin at the battery itself.

Last edited by Noah911; Oct 27, 2019 at 10:37 AM.

Oct 27, 2019 | 10:38 AM

#19

318SixPack

CF Veteran

Joined: Aug 2019

Posts: 1,601

Likes: 226

From: East Tennessee

Year: 1996

Model: Cherokee (XJ)

Engine: 242 cui

Check those four stupid wires that ground to the dip stick mount. Take them off, clean them, check how good the ring terminals are attached to the wires. Clean the stud with brake cleaner and a scotch bright, as well as all the connectors before putting back together, and spray a good silicone spray all over it after you get it together.

Oct 27, 2019 | 07:04 PM

#20

BlueRidgeMark

CF Veteran

Joined: May 2012

Posts: 7,965

Likes: 964

From: Lost in the wilds of Virginia

Year: 1998 Classic (I'll get it running soon....) and 02 Grand

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Noah911

It might have a new good working cps in it now? The odds of that are actually pretty good, since it was replaced.

If it was a non-Mopar CPS, the chances of it still being bad are rather high. It can't be assumed to be good.

Oct 28, 2019 | 07:37 AM

#21

Noah911

Banned

Joined: Feb 2019

Posts: 1,359

Likes: 169

From: NC

Year: 2004

Model: Grand Cherokee (WJ)

Engine: 4.0

I agree. Best to verify the CPS if getting a crank no-start condition, or if it is shutting down on you.. Scanner for cranking rpm, looking for spark, or using a multimeter to check the cps is showing as proper is good information to know.

Non-Mopar sensors may be faulty when new. They may not work correctly right out of the box. This seems to be the case many times, and is solidly agreed upon!

Last edited by Noah911; Oct 28, 2019 at 07:57 AM.

Oct 28, 2019 | 01:11 PM

#22

BillyBoy

CF Veteran

Joined: Aug 2009

Posts: 1,126

Likes: 30

From: Detroit, Michigan

Year: 1998

Model: Cherokee

Engine: 4.0

With the motor running and the hood open, grab the wiring harness across the top of the firewall under the windshield wipers....
SHAKE THE HECK OUT OF IT!
If it shuts down the wires are worn inside. Happened to both of my last 2 XJs.