loss of mileage

2001 GMC JIMMY
220,000 MILES • 6 CYL • 4WD • AUTOMATIC
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JUSFISHIN
  • MEMBER
  • 1 POST
2001 jimmy 4.3 sudden25% LOST MILEAGE was geting 400 kms now 300 kms aprox
changed wires and plugs already
Jan 21, 2011 at 7:53 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Make sre the air filter is clean. Check the catalytic converter is clean and free of plugging. If the check engine light is on, have the computer scanned for trouble codes.
Mar 4, 2011 at 5:24 AM
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