1999 Ford Ranger po171 &po174

1999 FORD RANGER
140,000 MILES • 4.0L • V6 • 2WD • AUTOMATIC
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EDDIEU
  • MEMBER
  • 5 POSTS
lean bank 1&2. replaced uper intake and lower intake gaskit do to vacuum leaks. replaced bank 1 sensor 2 do to 0 volt reading on scaner. Road test 50 to 60 miles codes come back. fuel pressure is 60 p.s.i. fuel filter good cleaned M.A.F. clar codes road test 60 miles befor codes come back.check on scaner downstrme flow tube off what is that?
Apr 13, 2014 at 8:13 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
did you replace isolator bolts? maf is a common problem on these clean carefully with choke or electrical cleaner, replace air filter also check for connection at pcv and any engine grommet will cause the same problem.
Sep 26, 2019 at 10:13 AM
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EDDIEU
  • MEMBER
  • 5 POSTS
Replaced M.A.F. road test 200 miles. truck fixed
Sep 26, 2019 at 10:13 AM
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