87 Jeep high Hydrocarbons- Emission Test


Old 04-07-05, 11:40 AM
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87 Jeep high Hydrocarbons- Emission Test

I have a 1987 Jeep Cheerokee, 4 Cyl, 4 Speed with 189,000 miles. I just had an emissions test and it failed Hydrocarbons. The reading was 3.63 and the standard to pass was 2.20. CO tested 21.80 and passed ( std 55.0) and NOx tested 3.14 and passed ( std 3.50). Any suggestions on how to get the Hydrocarbons in line? Thanks

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Old 04-07-05, 03:43 PM
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bump up the idle a bit, keep it under 1400 rpm in park and try again.

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