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Starts then shuts off

Tiny
SCOTT QUAIL
  • MEMBER
  • 1993 JEEP GRAND CHEROKEE LAREDO
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 19,500 MILES
Starts and runs for about three seconds then shuts off. I have got 35 psi on fuel.
Monday, August 13th, 2018 AT 1:39 PM

18 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi and thanks for using 2CarPros.com.

The pressure seems good as long as that is the regulated pressure. As far as the problem, does the engine start right back up or do you have to wait? What I suggest is to check for trouble codes. This is an OBD1 system and you can check for codes without a scanner.

Follow the directions in this link and let me know what you find.

https://www.2carpros.com/articles/retrieve-trouble-codes-for-chrysler-dodge-plymouth-odb1-1995-and-earlier-car-mini-van-and-light-trucks

Again, let me know what you find or if you have other questions.

Take care,
Joe

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Monday, August 13th, 2018 AT 6:50 PM
Tiny
SCOTT QUAIL
  • MEMBER
  • 12 POSTS
Does this Jeep have anti-theft system to stop it from running?
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Wednesday, August 15th, 2018 AT 1:50 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi Scott. Some did and others did not. Since it is a 1993, there is good chance it does not. Is there a security light coming on or flashing? Is this a Grand Cherokee or the original one?

By the way, let me know if you checked for codes and what they are if you found them.

Joe
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Wednesday, August 15th, 2018 AT 7:54 PM
Tiny
SCOTT QUAIL
  • MEMBER
  • 12 POSTS
I have checked the flash codes and it only gives me a code 12 because I have disconnected the battery so many times. And yes it is a grand Cherokee Laredo. Also there is no security light when I turn the key to run.
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Thursday, August 16th, 2018 AT 1:36 PM
Tiny
SCOTT QUAIL
  • MEMBER
  • 12 POSTS
Replaced distributor and still does the same thing. Any ideas now?
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Thursday, August 16th, 2018 AT 5:56 PM
Tiny
SCOTT QUAIL
  • MEMBER
  • 12 POSTS
  • 1996 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 197,000 MILES
The vehicle will start up and run for about three seconds then shuts off will start right back up and then shuts off. I have 35 psi at fuel rail port. I have replaced ASD relay checked all fuse all are good. Fuel pump was replaced about three weeks ago. Also I do not have a key that will unlock the doors. Ing cylinder was replaced before I got the vehicle. Can you help me resolve this problem?
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Friday, August 17th, 2018 AT 4:54 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

The first issue you have is the fuel pressure. It is too low. The spec is 49 lbs, not 35. That is the reason it is not running.

If it is three weeks old, it would be a warranty repair. Make sure they use a good brand fuel pump.

Did a shop perform the repair?

What brand pump did they use?

Roy

Engine at idle speed, 338 kPa ± 14 kPa (49.0 psi ± 2 psi).
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Friday, August 17th, 2018 AT 4:54 PM (Merged)
Tiny
SCOTT QUAIL
  • MEMBER
  • 12 POSTS
I am sorry my Jeep is a 1993 not 1996. Is the fuel pressure still the same? The old owner installed the pump so I am not sure of anything about the pump.
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Friday, August 17th, 2018 AT 4:54 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
39-41 is the spec. Still too low.

Roy
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Friday, August 17th, 2018 AT 4:54 PM (Merged)
Tiny
SCOTT QUAIL
  • MEMBER
  • 12 POSTS
Can you tell me if this Jeep has factory anti theft system to stop it from running?
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+1
Friday, August 17th, 2018 AT 4:54 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I can check but I doubt it. Do you have a chipped key?

Roy
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Friday, August 17th, 2018 AT 4:54 PM (Merged)
Tiny
SCOTT QUAIL
  • MEMBER
  • 12 POSTS
There is no markings on the only key that I have. I am going to replace fuel filter and check PSI again. What is the best way to check if I am losing spark or if fuel PSI is not enough?
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Friday, August 17th, 2018 AT 4:54 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
If your pressure is not at spec, then the fuel pump is bad.

Check for spark at the coil while cranking.

Roy

https://www.2carpros.com/articles/how-to-test-an-ignition-system

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Friday, August 17th, 2018 AT 4:54 PM (Merged)
Tiny
SCOTT QUAIL
  • MEMBER
  • 12 POSTS
I have good spark coming out of the coil when I use my spark tester. Also, now I have replaced the fuel filter and unhooked the vacuum to the regulator at cranking I have 40 psi. On fuel. I checked spark at the spark plug it seems to be losing spark when engine shuts off then spark comes back and it runs again then shuts off. If I hold the key in the run position I can watch the spark come and go every time it shuts off. Could it be the pick-up plate in the distributor?
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Friday, August 17th, 2018 AT 4:54 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
A very common issue is the crank sensor. It is located on the bell housing upper left side.

When this fails there will be no spark.

You can get it at any parts store.

Roy
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Friday, August 17th, 2018 AT 4:54 PM (Merged)
Tiny
SCOTT QUAIL
  • MEMBER
  • 12 POSTS
I have replaced the crank sensor still the same problem. I have ordered a new distributor. So I will let you know what I come up with. Thanks for your help so far.
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Friday, August 17th, 2018 AT 4:54 PM (Merged)
Tiny
SCOTT QUAIL
  • MEMBER
  • 12 POSTS
Well, I replaced the distributor and still the same problems. Any ideas?
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Friday, August 17th, 2018 AT 4:54 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you use a voltmeter and check the voltage to the ignition coil? You need battery voltage to the coil.

Roy
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Friday, August 17th, 2018 AT 4:54 PM (Merged)

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