2.5 runs but misses under load - JeepForum.com

 
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post #1 of 6 Old 05-06-2009, 09:59 AM Thread Starter
95_jeep_yj
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1995 YJ Wrangler 
 
Join Date: May 2009
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2.5 runs but misses under load

I got my first Jeep about a month ago, I have been reading the site since. The 2.5 never has overwhelmed me with power but now it wont hardly pull itself. It idles okay and when you rev it slowly but when it gets to about 4grand it misses and drops doen to about 2,500. When pulling itself it win't rev above 2,000rpm and has a top spedd of about 40. I changed the fuel filter, dist. cap, rotor, and plugs. That didn't change anything. It is running about 30lbs of fuel pressure at idle and 40 revved, I don't see a drop when it starts missing. Any ideas as to what the problem could be?

Thanks in advance for any help, Seth

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post #2 of 6 Old 05-06-2009, 10:55 AM
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit
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Miss

Check the FAQ and run diagnostics by cycling the key. Read the faults and post if there are any.
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post #3 of 6 Old 05-06-2009, 11:41 AM Thread Starter
95_jeep_yj
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1995 YJ Wrangler 
 
Join Date: May 2009
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I read the FAQ didn't see anything to help me. I tried cycling the key already with no codes. On a manual tranmission should you press the plunger down to turn the key all the way off when cycling for codes?
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post #4 of 6 Old 05-06-2009, 11:54 AM
Que89YJ
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1989 YJ Wrangler 
 
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Cycle the key from off to ignition on(the cluster turns on) then off again 3 times. The CEL light will blink if you have done it correctly. Here is a good explanation

http://www.allpar.com/fix/80s-codes.html
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post #5 of 6 Old 05-06-2009, 11:59 AM
SECorBust
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1995 YJ Wrangler 
 
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Location: Opelika, Alabama
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You need to check the power to the coil. My jeep had a short at the coil and would run intermittently. It definately sounds ignition related. Also everyone always says to check the crank position sensor.

95 Jeep wrangler 2.5 AX-15 conversion.
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post #6 of 6 Old 05-07-2009, 09:16 AM Thread Starter
95_jeep_yj
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1995 YJ Wrangler 
 
Join Date: May 2009
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Thanks for the help guys, I finally got it figured out. The catalytic converter was bad, the crap inside was broken loose and had plugged the exhaust. I just drilled a 2" hole in it and pulled everthing out. Not it sounds like one of them damn rice-burners gotta get that hole welded back lol
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