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Unread 09-30-2010, 08:18 PM   #1
crash183
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94' Wrangler engine problem

My brother just bought a 94' Wrangler with a 2.5L 4 cylinder and it's missing between about 2000 and 3000 RPM. Does anyone have any suggestions? He's replaced the O2 sensor and the crank positioning sensor, checked the plugs and wires and everything else we can think of. Any ideas?

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Unread 10-01-2010, 06:15 AM   #2
Roadyy
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1994 YJ Wrangler 
 
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Take the TPS and the AIC off of Throttle body and clean them. They are the 2 sensors connected to the throttle body. May also check the Temp Sending Unit at the thermostat housing to make sure it is good. If temp unit is bad it will not allow the ECM to get out of closed loop.
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Unread 10-01-2010, 12:48 PM   #3
squirrley
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1995 YJ Wrangler 
 
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I would start with the TPS and AIC like UBAY194 said then i would move onto the fuel system.Could be a "lazy" fuel pump
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Unread 10-01-2010, 11:30 PM   #4
crash183
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Re:

Hey guys, thanks, I'll let him know and I'll reply with the results.
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Unread 10-02-2010, 04:05 AM   #5
Mark05059
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I would also do a complete tune up (cap rotor plugs wires) on it as well.
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