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Old 02-25-2012, 07:12 AM   #1
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Join Date: Dec 2010
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4.0 in 89 yj won't stay running

I put a 4.0 in my 89 yj. It will start then it dies like it is running out of fuel. Have 55 lbs fuel pressure. Do I need to have my breather on to make it run?

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Old 02-25-2012, 07:48 AM   #2
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Location: Rockford, IL
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ill probably get boooed and incorrect buzzered but im thinkin check ignition system. bad coil, bad crank position sensor. never had one do that so idk

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Old 02-25-2012, 02:47 PM   #3
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4.0 won't stay running

This motor was running when pulled out. Will check ing system coil and crank sensor. I put noed on injector and it flashed for 4 sec and shut down, like electric just shut off.
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