1989 nissian pickup, Z24I 4 CYL, 133K miles, failed emissions test
today, please any suggestions.
HIGH Hydrocarbons at IDLE (765 rpm) HC = 320 LIMIT = 200 FAILED
results:
HIGH RPM
HC = 56 LIMIT 200
CO = 0.60 LIMIT 1.20
CO2 = 14.8
O2 = 0.75

LOW RPM
HC = 320 LIMIT 200 FAILED
CO = 0.78 LIMIT 1.2
CO2 = 15.0
O2 = 0.22
haven’t driven in awhile. today changed plugs, air filter, pcv filter
and replaced muffler. truck runs great, no problems at all. good
power, idles
fine etc.
thank you guys

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How old is the catalytic converter?

Cheers,
Geoff Glave
Vancouver, Canada

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