Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1966CHEVELLE BASE, 2D CONVERTIBLE, 4.6L ENG, AUTOMATIC TRANS, TRANS MFR CD POWERGLIDEREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONENGINE PERFORMANCESTATE EMISSION STANDARDS - GASU. S. EPA REVISED FINAL ASM EMISSION STANDARDS (ASM5015 & ASM2525)
1966 Chevrolet Chevelle Base, 2D Convertible, 4.6L Eng, Automatic Trans, Trans Mfr CD Powerglide
U. S. EPA Revised Final ASM Emission Standards (ASM5015 & ASM2525)
1966 Chevrolet Chevelle Base, 2D Convertible, 4.6L Eng, Automatic Trans, Trans Mfr CD PowerglideSECTION U. S. EPA Revised Final ASM Emission Standards (ASM5015 & ASM2525)
NOTE:
EPA has not published a revised final standards for High Altitude, Light Duty Trucks 2 (6000-8500 GVWR), or vehicles older than 1980 model year. EPA guidance as of February 2003 states that a program may choose to use combinations of the Original and the Revised Final Standards.
U.S. EPA REVISED FINAL ASM EMISSION STANDARDS
| Application | ASM5015 | ASM2525 | ||||
|---|---|---|---|---|---|---|
| HC ppm (CO %) | NOx ppm | HC ppm (CO %) | NOx ppm | |||
| Passenger Cars | ||||||
| 1980 | 275 (1.3) | 8500 | 500 (2.3) | 4750 | ||
| 1981-82 | 275 (1.3) | 3600 | 500 (2.3) | 3500 | ||
| 1983-89 | 275 (1.1) | 3600 | 500 (1.6) | 3500 | ||
| 1990 & Newer | 275 (1.1) | 3600 | 300 (1.6) | 3500 | ||
| Light Duty Trucks (Less Than 6000 GVWR) | ||||||
| 1980-83 | 1140 (9.7) | 14, 145 | 340 (23.28) | 32, 200 | ||
| 1984-87 | 537 (5.4) | 14, 145 | 160 (12.96) | 32, 200 | ||
| 1988-95 | 537 (5.4) | 7380 | 160 (12.96) | 16, 800 | ||
| 1996 & Newer | 275 (1.1) | 6150 | 82 (4.40) | 14, 000 | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.