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1990 Ford Ranger Emissions

Tiny
CHEVYMANN13
  • MEMBER
  • 1990 FORD RANGER
  • 6 CYL
  • 2WD
  • MANUAL
  • 62,284 MILES
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
Monday, October 18th, 2010 AT 2:54 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
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
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Tuesday, October 19th, 2010 AT 9:33 PM
Tiny
CHEVYMANN13
  • MEMBER
  • 2 POSTS
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
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Tuesday, October 19th, 2010 AT 10:45 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Glad to help. Let me know how you make out.

Joe
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Wednesday, October 20th, 2010 AT 7:59 AM

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