Gas issue please help
Thread Starter
Newbie
Joined: Feb 2018
Posts: 1
Likes: 0
Year: 1998
Model: Cherokee(XJ)
Engine: 4.0L
Gas issue please help
I have had my 1998 XJ for 4 days now. Yesterday while driving, it was getting gas just fine then the RPMs would drop as if no gas was getting in the enigine. A few seconds later the RPMs would jump back up as if the engine gained gas again. This would happen 5 or 6 times in a row then not at all. I parked the XJ for about 2 hours then went for a drive again, same thing happened. Yes the gas tank has gas... please help... could it be the fuel pump going out?
CF Veteran
Joined: Nov 2017
Posts: 3,700
Likes: 238
From: Groton, MA
Year: 1995
Model: Cherokee(XJ)
Engine: I6 4.0L
You want to do a fuel pressure test if you suspect the fuel pump is failing. You can usually rent a test tool from your local auto parts retailer for free (with deposit). Your pressure should be 49.2psi +- 5 per the spec.
If it's happening consistently like that, it should be pretty easy to test.
You also should consider replacing your fuel filter since you don't know when the last time it was done.
If it's happening consistently like that, it should be pretty easy to test.
You also should consider replacing your fuel filter since you don't know when the last time it was done.
Junior Member
Joined: Aug 2016
Posts: 68
Likes: 0
From: Santa Clara, CA
Year: 1996
Model: Cherokee
Welcome to the forum and congrats on the XJ. If your fuel pressure test checks out, I would think its the CPS that's causing issue. Lots of info out there and on this forum about them for good reason. Pull yours and test it, and if it's bad make sure you shell out for a Mopar replacement, aftermarket brands are often bad out of the box.
CF Veteran
Joined: Jan 2015
Posts: 1,469
Likes: 26
From: North canaan Connecticut
Year: 01, 99, 98, 98,98
Model: Cherokee
Engine: 4.0
Is the check engine light on? Checking any trouble codes would help if so. Also there's a couple of different sensors that could cause similar problems.
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