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 MANUALSCHEVROLET1966CHEVY II BASE, NOT AVAILABLE, 2.5L ENG, AUTOMATIC TRANS, TRANS MFR CD THM400REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETUNE-UPEXHAUST EMISSION SYSTEMS - TUNE-UP
1966 Chevrolet Chevy II Base, Not Available, 2.5L Eng, Automatic Trans, Trans Mfr CD THM400
Exhaust Emission Systems - Tune-Up
1966 Chevrolet Chevy II Base, Not Available, 2.5L Eng, Automatic Trans, Trans Mfr CD THM400SECTION Exhaust Emission Systems - Tune-Up
- Description
- Service Procedures
- Ignition System
- Carburetion
- Idle Speed & Mixture Adjustment
- Notes
- All Models (1966-67)
- All Models (1968-69)
- All Models, 153" 4 Cylinder (1970)
- All Models, 230" & 250" 6 Cylinder (1970)
- All Models, 307" & 400"/265 HP (1970)
- All Models, 350"/250 HP (1970)
- All Models (Exc. Corvette), 350"/300 HP & 400"/335 HP (1970)
- All Models (Exc. Corvette), 396"/400 HP, 400"/400 HP, & 454"/450 HP (1970)
- All Models (Exc. Corvette), 396"/350 HP, 454"/345 HP, 454"/360 HP & 390 HP (1970)
- Corvette Models Only (1970)
- All Models (1971)
- Preliminary Idle Speed and Mixture Adjustment
- Final Curb Idle Speed Adjustment
- Preliminary Idle Speed & Mixture Adjustment
- Tachometer Lean Drop Procedure (Preferred Method)
- Exhaust Gas Analyzer (Alternate Method)
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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.