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1994 Pontiac Firebird 3.4L Emissions

115 Views 2 Replies 3 Participants Last post by  ZumpTA, 
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Im having trouble trying to pass emissions here in Colorado have changed multiple things and still having the same issue.
Things I’ve changed
-EGR Valve
-Evap canister
-Fuel pump
-Spark plug and wires
-Air filter
Anything else I should look out for I’ve hit a dead stop and can’t figure out where to go now
Would appreciate the help.
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Injuneer
Sounds like the catalytic converter may be bad. Unusual to fail on both HC and NOx. Usually it’s one or the other. Would have been the first thing to check, rather than randomly replacing parts.
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