1990 Ford Ranger Emissions

1990 FORD RANGER
62,284 MILES • 6 CYL • 2WD • MANUAL
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CHEVYMANN13
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It passes the high idle test with flying colors, but the low idle test, it fails, low co2 with high hydrocarbons, what can I do to fix this prob asap
Oct 18, 2010 at 2:54 PM
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JACOBANDNICKOLAS
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What you are describing doesn't make sense to me. Elevated HC usually indicate a rich mixture (at idle). However, that also causes the CO2 to be high. Are you sure CO2 was low?

Common causes are plugged air filter, engine not warming up to proper operating temp due to a bad thermostat or temp sensor. Also, do you have a rough idle? Worn plugs, plug wires, stuck EGR... can cause it too.

Let me know.

Joe
Oct 19, 2010 at 9:33 PM
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CHEVYMANN13
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Hey thanks for the info, yeah, the co's were extremely low, the hc's were at 341, limit here of 220 I believe, the things you described, are all things I went over today, and did find a few problems. Plugged air filter, and some other stuff. I sure appreciate it a bunch
Oct 19, 2010 at 10:45 PM
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JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 POSTS
Glad to help. Let me know how you make out.

Joe
Oct 20, 2010 at 7:59 AM
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