Constantly failing emissions, #'s
Thread Starter
Senior Member
Joined: Jan 2009
Posts: 611
Likes: 3
From: DE
Car: 1990 Firebird Formula
Engine: LB9 - 5.0 TPI
Transmission: 700R4
Axle/Gears: 2.73, LSD
Constantly failing emissions, #'s
HC (PPM) Low is idle, high is 2500 RPM
LOW HIGH
297 180
Limit: 220 220
CO (%)
LOW HIGH
4.52 5.79
Limit: 1.20 1.20
CO(%)+CO2(%)
LOW HIGH
11.87 12.47
Limit: n/a
CAT. CONV.: PASS
HOSE/CANISTER: PASS
FUEL CAP: PASS
EGR is less than 2 years old, air filter is good, 3 wire heated o2. Possibly a mild cam, but not sure. Really not sure where to start. May take it to a shop because my tags expire Friday but I'd like to know what you guys think.
LOW HIGH
297 180
Limit: 220 220
CO (%)
LOW HIGH
4.52 5.79
Limit: 1.20 1.20
CO(%)+CO2(%)
LOW HIGH
11.87 12.47
Limit: n/a
CAT. CONV.: PASS
HOSE/CANISTER: PASS
FUEL CAP: PASS
EGR is less than 2 years old, air filter is good, 3 wire heated o2. Possibly a mild cam, but not sure. Really not sure where to start. May take it to a shop because my tags expire Friday but I'd like to know what you guys think.
Thread Starter
Senior Member
Joined: Jan 2009
Posts: 611
Likes: 3
From: DE
Car: 1990 Firebird Formula
Engine: LB9 - 5.0 TPI
Transmission: 700R4
Axle/Gears: 2.73, LSD
Re: Constantly failing emissions, #'s
Alright so I think I'll just set my timing back to get through so I can have legal tags...how far back can I safely put it?
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