showing 4x allowable fuel on emmisions test

1993 GMC SONOMA
225,000 MILES
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MARTIN2581
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  • 1 POST
93 gmc sanoma 2.8 throttle body injection . just took it through emmisions 3rd time and failed again . catalytic converter passes , test shows 4x allowable fuel gasses. have changed injectors , egr valve . o2 sensor changed 2 years ago . no problems at all before I changed injectors now have reset computer every couple days to get rid of hesitation and sputter. gas consumption hasn't dropped a bit. im out of ideas
Jul 10, 2013 at 9:25 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
scan for codes, on site here it tells how to do it and what codes mean look under obd1 Or you can try to chage oil and filter, air filter, take it on eway for about 15 miles then get it tested.
Jul 10, 2013 at 10:54 AM
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