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1998 F 150 g gas mileage problems with factory rebuilt 4.2.

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Old 05-25-2018, 12:49 PM
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1998 F 150 g gas mileage problems with factory rebuilt 4.2.
Having gas mileage problems with factory rebuilt 4.2. Old 4.2 18 mpg . New rebuilt 12 mpg. Is programing wrong. 1998 F150
 
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Old 05-25-2018, 02:31 PM
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How many tanks have you ran through the new (rebuilt) engine?
 
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Old 05-25-2018, 03:06 PM
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I have 300- miles on the 4.2
 
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Old 05-25-2018, 03:07 PM
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I now have 3000 miles
 
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Old 05-25-2018, 07:21 PM
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Ok. You might want to check your O2 sensors. Maybe replace them.

What was the reason for the new engine?
 
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Old 08-07-2018, 09:53 AM
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Did you triple check all of your vacation hose and clamps are hooked up correct ? None are reversed?
 
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