1994 Jeep Grand Cherokee motor shutdown


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1994 Jeep Grand Cherokee motor shutdown

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Motorhead1
New User

Dec 8, 2006, 11:06 AM

Post #1 of 5 (3791 views)

1994 Jeep Grand Cherokee motor shutdown	Sign In

My cherokee cranks and runs for approximately four seconds. Then shuts itself off. We have replaced fuel filter, fuel pump, and fuel pump relay, and automatic shutdown relay. I've checked all vacuum connections and everything seems fine. I'm scratching my head. Does anybody have any idea what my next move should be?

carjunky
Enthusiast

Dec 8, 2006, 5:44 PM

Post #2 of 5 (3785 views)

Re: 1994 Jeep Grand Cherokee motor shutdown	Sign In

Sell It..

Just kidding ( I just drove home in traffic with no heat so I couldn't even depend on the air follow to heat me up degrees outside)

Does it seem to choke out or just die?

I would check for some spark from a plug as well, this way you can tell if it may be the Distributor Cap or somewhere in the ignition system

steve01832
Veteran
steve01832 profile image

Dec 9, 2006, 2:10 AM

Post #3 of 5 (3782 views)

Re: 1994 Jeep Grand Cherokee motor shutdown	Sign In

Hook a fuel pressure guage up to the test port. Crank the engine and the guage should hold steady around 35 psi. If the fuel pressure starts to drop, or you don't read fuel pressure, check for power and ground at the fuel pump module. You may have a faulty fuel pump relay or a blown fuse.
You can confirm a fuel supply problem by taking a propane bottle and putting a rubber fuel line hose on the end of the torch fitting. Direct the propane into the air cleaner housing and have an assistant crank the engine as you open the valve. If the engine starts and runs, you have narrowed the problem to fuel.
Use caution with the propane method!!! You do have a risk of a flash fire if the propane hits ignition wires that are deteriorated!!! This is a common procedure at my shop but I am still extremely cautious each and every time!

Steve

Motorhead1
New User

Dec 9, 2006, 12:08 PM

Post #4 of 5 (3779 views)

Re: 1994 Jeep Grand Cherokee motor shutdown	Sign In

I really appreciate the ideas. I'm getting a fuel pressure guage. I'll try checking the pressure and the spark and post back when I have some results. Thanks again for all the ideas.

EMT418
New User

May 16, 2007, 7:18 PM

Post #5 of 5 (3717 views)

Re: 1994 Jeep Grand Cherokee motor shutdown	Sign In

Hey STeve. I've got the same problem with the same type of vehicle. I've checked everything and this is driving me crazy. Tell ya what if you have any way of privately contacting me, please let me know. I can give you an e-mail or a phone number. This is driving me crazy.....

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