Crank No fuel no spark - JeepForum.com
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post #1 of 8 Old 07-26-2021, 09:50 AM Thread Starter
jeffries_900
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Crank No fuel no spark

Hello Just bought a 1993 Grand Cherokee limited 5.2 I was told it had a bad fuel pump so i replaced the fuel pump.
It started and ran for 8 Min then died and would not restart no fuel pressure or spark has voltage at coil but no pulse when starting. I tested the cam sensor and it was good i replaced the crank sensor and still does same.

If I turn the key on and leave for 5 min the asd relay will click for a few and stop then i have fuel and spark and it will run for a while and then die. I also have cleaned the computer connections and battery cables at the battery.

The security wire by the kick panel has been grounded, but have noticed if i leave the key on for 5 min the security light on the dash comes on.

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post #2 of 8 Old 07-26-2021, 04:47 PM
RedRiverT
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Maybe the ASD relay has a problem. I don't know about a '93, but it is probably the same model of relay as the A/C or horn, so you can switch them and see if it will run. Also check the prongs on the relay and the sockets they plug into.
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post #3 of 8 Old 07-26-2021, 05:16 PM
PolkaPower
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Does it crank? No crank could be the neutral safety switch too. Usually reverse lights are gone as well when it's bad or unplugged.


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post #4 of 8 Old 07-27-2021, 04:41 AM
V8GCZJ
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post #5 of 8 Old 07-27-2021, 06:50 AM Thread Starter
jeffries_900
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It will crank every time just will not start. you can turn the key on for 5minutes and the asd relay will click and make noise then it will stop. I then check and i have fuel pressure and spark and it will start but later will die.

I have switched relays and cleaned with key on (on the Asd relay) all terminals but one are 12v and one ground.

But now i have noticed if i leave the key on for over 5 3 min the security light on the dash comes on

Also i have no been able to produce any codes

Thanks Clay
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post #6 of 8 Old 07-28-2021, 06:44 AM Thread Starter
jeffries_900
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I did notice the engine light flashing everytime the asd relay clicked. but once it runs for few min it dies and will not started or asd will not click
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post #7 of 8 Old 07-29-2021, 04:54 AM
V8GCZJ
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Asd relay will only come on when you turn the ignition to on/crank. If you leave the key in the on position(not cranking) the asd relay will shut off after a few seconds. Even if you have no codes you should get a 55 code meaning end of codes.
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post #8 of 8 Old 07-30-2021, 11:57 AM Thread Starter
jeffries_900
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***FIXED****
After doing more testing I replaced the three Capacitors on the computer board.
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