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Old 01-13-2011, 10:58 PM   #1
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power loss in 4.0 liter jeep yj

I've changed spark plugs,wires,cap and rotor,air filter and fuel filter,and still have no power.Tommorrow,I will check exhaust system.I am suspecting the catylitic converter at this point.If anybody has the diagnostic codes for a '93 jeep 4 liter these may come in handy...thanks.

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Old 01-14-2011, 02:25 AM   #2
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Welcome. hmm. i don't know much about the YJs but i do know if u try posting in the YJ section of the forum they can help you

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Old 01-14-2011, 02:48 AM   #3
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Welcome I have a quick question for you, what size tires does the jeep have? If it's been lifted and has bigger tires it could be that the gears were never changed and that would deffinately rob power from the engine.
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Old 01-14-2011, 04:07 AM   #4
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How are the O2 sensors?
Last oil change?
Just suggestions, trying to help.
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Old 01-14-2011, 05:47 AM   #5
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Welcome!
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Old 01-14-2011, 08:28 AM   #6
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Welcome to WF.
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Old 01-15-2011, 03:38 PM   #7
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power loss in jeep yj

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Originally Posted by yjman66 View Post
I've changed spark plugs,wires,cap and rotor,air filter and fuel filter,and still have no power.Tommorrow,I will check exhaust system.I am suspecting the catylitic converter at this point.If anybody has the diagnostic codes for a '93 jeep 4 liter these may come in handy...thanks.
Changed exhaust system,02 sensor,and tps sensor today.Problems solved and running better than ever!!
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Old 01-15-2011, 03:44 PM   #8
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Glad to hear it!
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Old 01-15-2011, 03:51 PM   #9
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Changed exhaust system,02 sensor,and tps sensor today.Problems solved and running better than ever!!
the exact problem was the cat converter restricting exhaust flow as it was dated, but threw in the extras thru the process of troubleshooting!
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Old 01-15-2011, 04:10 PM   #10
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Welcome. hmm. i don't know much about the YJs but i do know if u try posting in the YJ section of the forum they can help you
Thanks for the advice,but fyi a yj is a wrangler.Have another beer!
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Old 01-15-2011, 04:12 PM   #11
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Welcome!
lol,hopefully you can please her..

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