Stalling and restarting issue
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Newbie
Joined: Jul 2021
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Model: Cherokee (XJ)
Stalling and restarting issue
lately when im driving around and i floor the accelerator, my engine stalls and has trouble starting up again. i suspect a faulty CPS, can anyone verify that this issue is a symptom of a faulty CPS? what else could it be?
CF Veteran
Joined: Aug 2020
Posts: 2,137
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From: SoCal
Year: 1988
Model: Cherokee (XJ)
Engine: 4.0L
Verify? No. Is it a likely suspect? Yes. Does it restart once it cools off?
Assuming nothing mechanically wrong with the engine, you need spark and fuel. So you would have to test for both.
What year is your XJ?
Assuming nothing mechanically wrong with the engine, you need spark and fuel. So you would have to test for both.
What year is your XJ?
Thread Starter
Newbie
Joined: Jul 2021
Posts: 3
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Model: Cherokee (XJ)
i have a 1989 limited. Yes, eventually when it cools down it starts fine. how would u recommend i test for fuel?
CF Veteran
Joined: May 2012
Posts: 7,965
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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
There is only one valid test for fuel. A fuel pressure gauge. You can usually rent one for free at Autozone or similar stores.
Yes, I agree with Saudade that the CPS is possible, but check your fuel pressure first. A marginal pump will give those symptoms.
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Joined: Aug 2011
Posts: 43,971
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
That's not really a symptom of a faulty CPS.
Before I spent a dime on parts, I would go to www.cruiser54.com and complete Tips 1,3,4, and 5. Take less than an hour.
Before I spent a dime on parts, I would go to www.cruiser54.com and complete Tips 1,3,4, and 5. Take less than an hour.
CF Veteran
Joined: Aug 2020
Posts: 2,137
Likes: 580
From: SoCal
Year: 1988
Model: Cherokee (XJ)
Engine: 4.0L
Fortunately, your 89 has a fuel test port on the rail. Take the cap off and connect the fuel pressure gauge. Turn the key to ON but do not start. The pressure should read around 39 psi. Now start (if it can). The pressure should drop to around 31 psi. Finally, remove the vacuum line from the end of the pressure regulator. The pressure should jump back to 39 psi. Once you reconnect it, it will drop back to 31 psi. This will verify your fuel pump and pressure regulator are good.
As for dies when hot, that's exactly what my '88 did once upon a time. Took 20 min or so with the hood up to cool off enough to start and then died once it got hot again. It was my CPS. There are a number of YT vids on testing and changing the CPS. Cruiser's tip #50 also details the test.
As for dies when hot, that's exactly what my '88 did once upon a time. Took 20 min or so with the hood up to cool off enough to start and then died once it got hot again. It was my CPS. There are a number of YT vids on testing and changing the CPS. Cruiser's tip #50 also details the test.
CF Veteran
Joined: Aug 2009
Posts: 1,126
Likes: 30
From: Detroit, Michigan
Year: 1998
Model: Cherokee
Engine: 4.0
Fortunately, your 89 has a fuel test port on the rail. Take the cap off and connect the fuel pressure gauge. Turn the key to ON but do not start. The pressure should read around 39 psi. Now start (if it can). The pressure should drop to around 31 psi. Finally, remove the vacuum line from the end of the pressure regulator. The pressure should jump back to 39 psi. Once you reconnect it, it will drop back to 31 psi. This will verify your fuel pump and pressure regulator are good.
As for dies when hot, that's exactly what my '88 did once upon a time. Took 20 min or so with the hood up to cool off enough to start and then died once it got hot again. It was my CPS. There are a number of YT vids on testing and changing the CPS. Cruiser's tip #50 also details the test.
As for dies when hot, that's exactly what my '88 did once upon a time. Took 20 min or so with the hood up to cool off enough to start and then died once it got hot again. It was my CPS. There are a number of YT vids on testing and changing the CPS. Cruiser's tip #50 also details the test.
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