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Old 04-12-2011, 10:30 PM   #1
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Default No spark!!!

so bought a 99 Cherokee 4.o a couple months ago it was sitting in a barn for approximately 4 years its in great shape but i cant get it start its showing about 12 volts from the coil but its not sparking at the plugs i picked up a new coil, rotor, wire, plugs and a cap and still same thing wont start every now and then when i spray starter fluid into the intake it will fire real quick but it wont start i was thinking the cps but when that went out on my 97 zj it wouldnt even fire i already checked all the fuses and there all fine does anybody have any other ideas?
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Old 04-12-2011, 11:03 PM   #2
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CPS and pickup coil should fix it for you.
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Old 04-12-2011, 11:15 PM   #3
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alright ill try that is there any way to test the cps? volt ohm or anything?
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Old 04-13-2011, 07:09 AM   #4
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1. Test your crank sensor. Test your cam sensor. Both are suspects here.

2. Also test your fuel pressure. You need to have approx. 49 psi at the fuel rail for this engine to fire. Gotta use a fuel pressure gauge to rule this in or out.
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Old 04-13-2011, 07:13 AM   #5
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gasoline after four years aint doing any good either its just adding to the problem
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its all in your altitude,horn broke watch for fingerWhen asking for help here and not listening to test procedures why ask.
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Old 04-13-2011, 07:14 AM   #6
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Quote:
Originally Posted by XJmanXJ View Post
so bought a 99 Cherokee 4.o a couple months ago it was sitting in a barn for approximately 4 years its in great shape but i cant get it start its showing about 12 volts from the coil but its not sparking at the plugs i picked up a new coil, rotor, wire, plugs and a cap and still same thing wont start every now and then when i spray starter fluid into the intake it will fire real quick but it wont start i was thinking the cps but when that went out on my 97 zj it wouldnt even fire i already checked all the fuses and there all fine does anybody have any other ideas?
if its fireing real quick fuel issue would be first concearn
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Old 04-13-2011, 06:44 PM   #7
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Quote:
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gasoline after four years aint doing any good either its just adding to the problem
I agree. Siphon every ounce of the old fuel out before continuing, and fill with fresh fuel.

Bad fuel will contaminate your entire fuel system including your fuel injectors.
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Old 04-14-2011, 08:36 PM   #8
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i agree with the whole fuel thing but that doesnt explain my spark issue
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Old 04-14-2011, 11:27 PM   #9
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Check this fuse.
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Old 04-15-2011, 07:25 AM   #10
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You must have some spark or it wouldn't even try to fire.

Next step is to check QUALITY of spark.

Pull a plug, keep it attached to the plug wire, place the plug electrode near a good engine ground, have a buddy crank the engine while you watch. You are looking for a strong, blue, snapping spark. Yellow/orange/white indicates a weak spark, which may not be strong enough to start the engine.

Report back what you find. Verifying quality spark is the FIRST thing I do for a no-start.
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Old 04-17-2011, 11:12 PM   #11
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i don't see any spark it seems like it doesn't always spark and for the fuse that's not my fuse box layout and i don't have any small 30 amps i already checked all the fuses under the hood any in the pass compartment i should check?
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Old 04-18-2011, 12:57 AM   #12
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"when i spray starter fluid into the intake it will fire real quick "

Ya got spark, this proves it.
Missing fuel.

Drain that tank and purge the fuel line at the fuel rail.
Then reconnect the fuel line and attempt to start.
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