just failed emissions
Thread Starter
Joined: May 2007
Posts: 145
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From: stratford nj
Car: 1991 camaro rs
Engine: 305tbi with mods
Transmission: t-5
Axle/Gears: 3.08
just failed emissions
unfortunately i just failed emissions guys, totally sukcs lol, neway heres what i failed for, HC which i had a reading of 194 wen the average is 120, and C0% my reading was 6.89 and the standard is 0.67! i just recently ordered a new hooker catback and catco cat, do you think this will help?
Junior Member
Joined: Aug 2006
Posts: 79
Likes: 1
Re: just failed emissions
Copied from aa1car.com:
Common denominator? You're more then likely way rich. I'd replace your O2 sensor first, and make sure you don't have any SES codes. If your engine hasn't had a tune up in a while, that would be another good start, plugs, wires, air filter, pcv, oil change, run seafoam through your engine, etc.
Elevated hydrocarbon (HC) emissions usually indicate ignition misfire due to fouled spark plugs or a bad plug. But high HC emissions can also be caused by burned exhaust valves (check compression), lean misfire (check for vacuum leaks, low fuel pressure or dirty injectors), or rich fuel conditions (fuel saturated carburetor floats, excessive fuel pressure, leaky injectors or a dead O2 sensor).
High carbon monoxide (CO) emissions are a telltale sign of a rich fuel mixture. On older carbureted vehicles, fuel-saturated plastic floats, incorrect float settings, leaky power valves and misadjusted chokes are often responsible for the rich mixture. On newer vehicles with feedback fuel controls and fuel injection, leaky injectors, excessive fuel pressure and sluggish or contaminated O2 sensors are all possibilities to investigate.
High carbon monoxide (CO) emissions are a telltale sign of a rich fuel mixture. On older carbureted vehicles, fuel-saturated plastic floats, incorrect float settings, leaky power valves and misadjusted chokes are often responsible for the rich mixture. On newer vehicles with feedback fuel controls and fuel injection, leaky injectors, excessive fuel pressure and sluggish or contaminated O2 sensors are all possibilities to investigate.
Senior Member
Joined: Jul 2007
Posts: 1,461
Likes: 1
From: Manchester, CT + Nashua, NH
Car: 90 Firebird Formula
Engine: LO3
Transmission: T5
Axle/Gears: 3.08 one wheel peel
Re: just failed emissions
My guess is that when you take out your old catalytic convertor, you will find that it might not be in the best working order.
Also, you probably are running somewhat rich. If you are, this will eat through your catalytic convertor, and cause holes, or it will be gone all together inside.
DO the tune-up like everyone recommended. Then, put your new exhaust on. You will probably pass.
If you fail again, look for a thread about using rubbing alcohol in your gas tank before emissions. Even though, if you wanna do it use denatured alcohol from home depot. The thread tells you everything you need to know to cheat the system.
Also, you probably are running somewhat rich. If you are, this will eat through your catalytic convertor, and cause holes, or it will be gone all together inside.
DO the tune-up like everyone recommended. Then, put your new exhaust on. You will probably pass.
If you fail again, look for a thread about using rubbing alcohol in your gas tank before emissions. Even though, if you wanna do it use denatured alcohol from home depot. The thread tells you everything you need to know to cheat the system.
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