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1989 Jeep Cherokee - no power


 
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bille
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Joined: 23 Jun 2005
Location: Ephrata, Pa

PostPosted: Thu Jun 23, 2005 5:51 pm    Post subject: 1989 Jeep Cherokee - no power Reply with quote

I 4.0L has plenty of power when cold, but loses power when the weather is warm, if the line from the MAP sensor is pulled off and left open, it has plenty of power but lopes when it is idling (gas mileage also drops from 20 to 22 mpg to ~ 16 mpg). MAP, MTS, CTS, air filter, and gas filter are new, all sensor connections have been cleaned. Stupid thing passed PA emissions test even when running this way. Any ideas on the cause???
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