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.
SYS.OK|MANUAL.DB● LIVE
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-UPIDLE SPEED & MIXTURE ADJUSTMENTALL MODELS (1966-67)
1966 Chevrolet Chevy II Base, Not Available, 2.5L Eng, Automatic Trans, Trans Mfr CD THM400
All Models (1966-67)
1966 Chevrolet Chevy II Base, Not Available, 2.5L Eng, Automatic Trans, Trans Mfr CD THM400SECTION All Models (1966-67)
- Set parking brake firmly and bring engine to normal operating temperature. Remove air cleaner. Connect suitable tachometer and vacuum gauge to engine, place transmission selector lever into Neutral.
- For preliminary adjustment, turn idle mixture screws lightly against seat then back out (counterclockwise) 1 1/2 turns.CAUTION: Do not turn idle mixture screw tightly against seat or damage may result.
- With engine running (choke wide open), adjust idle speed screw to specified idle speed with automatic transmission in "D" and manual transmission in Neutral. Adjust idle mixture screw to obtain highest steady vacuum at specified idle speed.NOTE: On air conditioned vehicles, turn to "ON" position and hold hot idle compensator valve closed while adjusting idle speed and idle mixture screws. On Rochester BV carburetors, the idle mixture screw should be turned out 1/4 turn from Lean Drop position.
- If necessary, final carburetor adjustment can be made with air cleaner in place. Shut off engine, and remove tachometer and vacuum gauge.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.