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Excessive carbon monoxide readings.

Tiny
DONCROZE
  • MEMBER
  • JEEP CHEROKEE
I have an 87 Jeep cherokee with a 4.0 inline 6 engine. It has 260,000 miles. It actually runs ok except it does not get very good gas mileage. I get about 210 miles to tank of gas. But it recenty failed DEQ. The standard for CO is 1 and my reading was 6.0472. The CO2 reading was 10.5. It passed the HC. I have recently replaced the spark plugs the dis cap and wires. What would be some things that could get the CO reading down. Thanks Don
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Tuesday, March 6th, 2007 AT 6:36 PM

3 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Has the catyletic converter ever been changed? How about the oxygen sensor? Both contain reactive materials that only last so long.
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Wednesday, March 7th, 2007 AT 7:40 AM
Tiny
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They have not been changed recently and I can do that and it may reduce the co readings. But will that help solve the main problem which is why I am burning more gas than I should? Thanks for your response. Don
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Wednesday, March 7th, 2007 AT 8:36 AM
Tiny
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Also I did fail to mention that this is an injector system, I have replaced the injectors with an aftermarket set. Could these be injecting more gas than they should?
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Wednesday, March 7th, 2007 AT 8:37 AM

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