91 4.0 cranks, has spark and fuel but won't start - Jeep Wrangler Forum

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Old 10-01-2010, 03:52 PM   #1
Join Date: Sep 2010
Posts: 5
91 4.0 cranks, has spark and fuel but won't start

Originally I wasn't getting spark so I changed the cap and rotor, seems to be getting spark but won't start, could it be the cps? I checked it and it seems to be ok but I'm not sure what it could be at this point... Thanks in advance

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Old 10-01-2010, 03:58 PM   #2
Join Date: Jan 2010
Location: Las Cruces, NM
Posts: 2,303
Is this problem new? did you do anything prior to the problem like change the distributor or wires?

(Sold)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights
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Old 10-01-2010, 08:02 PM   #3
Join Date: Sep 2010
Posts: 5
I just got it and the original engine had problems, when I took it apart there was gouges on the cylinder walls in the 1 and 5 cylinders.. I got a new engine an put it in and originally the 1 and 5 cylinders were not sparking.. I used the new block and head from the new engine everything else from the old, I am not sure what is causing the same cylinders not to spark tho... I changed the cap and rotor and the it didn't help, could I have a bad distributor? The spark is intermittent, I'm getting it on and off so I'm not really sure
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