1988 Jeep Comanche poor gas milage

1988 JEEP COMANCHE
135,000 MILES • 4 CYL • 2WD • MANUAL
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ANTON925
  • MEMBER
  • 8 POSTS
Starting few months back truck start to get realy poor milage from 28 miles per gallon to 16mpg I replased spark plugs,ingntion wires all filters map sensor , no improvement What is wrong? what is next?
Jan 14, 2009 at 2:14 AM
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2CARPRO JACK
  • ✓Experienced Mechanic
  • 11,533 POSTS
Check the fuel pressure regulator. It is located on thefuel rail, and has a vacuum line that goes to the intake manifold.If there is any fuel in the vacuum line , the reg needs to be replaced. Any check engine light?
Jan 14, 2009 at 3:14 AM
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