failed emssions test

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Dec 1, 2005 | 05:34 PM

fastfbody

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From: Smithville TN

Car: 1989 GTA trans am

Engine: L98 350 tpi

Transmission: 700r4 built

Axle/Gears: 3.45 4th gen 10 bolt

failed emssions test

both co and hco dont know why car runs drives great does not smoke or eat gas. havent tried anything yet just wondering what are a few thingsto start with.

Dec 1, 2005 | 10:32 PM

MaNiAk86

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From: Highwood, IL

Car: 1983 trans am

Engine: Vortec 350 w/ a comp cam

Transmission: B&Mth350 2800holeshot

Axle/Gears: 10bolt 3.23's

what kind of shape is the exhaust system in? especially the cat

also check for o2 sensors and such

Dec 9, 2005 | 06:12 PM

8UpAFord

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Joined: Mar 2005

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Car: 1988 Corvette

Engine: 5.7L TPI L98

Transmission: 700R4

Axle/Gears: D36 2:59

You have any mods that might effect it? Car running good? How bad did it fail post you readings. I just failed the other day for the same. Bastards keep enforcing the test making it harder to pass. First time i pass with no main cat just puppy cats. second time i failed which was like 2 weeks ago. I cut fuel, retard timing from 6 to 4, increased my temps all via ECM. And i slapped a cat on it. It passed pretty good then.

Dec 16, 2005 | 01:39 PM

TKOPerformance

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Joined: Dec 2003

Posts: 2,391

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From: Newark, DE

Car: '86 Camaro, '02 WRX, '87 K5, '67

Engine: 350 TPI, 2.0turbo, 383 in the works, 289-4BBL, 232, A-head 4-cylinder

Transmission: T56, 5-speed, 700R4, C4, T176, semi-auto 2-speed

Axle/Gears: 3.73, 3.90, 4.88, 3.55, 3.54, 7.00

Yeah, need to know how bad you failed. If it's close you can crutch by adjusting the timing, adding some rubbing alcohol to the gas tank (1-2 pints), and lowering your fuel pressure.

Make sure you run through when the car is fully warmed up too. Keep it running in line before you go through so it's fully warmed up.