4.0 in 89 yj won't stay running - Jeep Wrangler Forum

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Old 02-25-2012, 07:12 AM   #1
Join Date: Dec 2010
Posts: 16
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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Join Date: Feb 2012
Location: Rockford, IL
Posts: 136
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

some may call it overbuilt. my right foot calls it future scrap.
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Old 02-25-2012, 02:47 PM   #3
Join Date: Dec 2010
Posts: 16
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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