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 MANUALSCHEVROLET1972CHEVELLE BASE, NOT AVAILABLE, 7.4L ENG VIN V, NOT AVAILABLE TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETUNE-UPTUNE-UP - V8HOT (SLOW) IDLE RPM

1972 Chevrolet Chevelle Base, Not Available, 7.4L Eng VIN V, Not Available Trans

Hot (Slow) Idle Rpm

1972 Chevrolet Chevelle Base, Not Available, 7.4L Eng VIN V, Not Available TransSECTION Hot (Slow) Idle Rpm

With engine at normal operating temperature, air cleaner installed, choke open and air conditioning OFF, disconnect fuel tank to vapor canister hose (remove gas cap on Corvette), disconnect and plug distributor vacuum hose.

Start engine and disconnect idle stop solenoid electrical connection. Adjust low idle speed screw to 450 RPM (Rochester Carburetors), 500 RPM (Holley Carburetors).
Set dwell and timing, recheck low idle speed. Reconnect solenoid, open throttle momentarily, adjust solenoid plunger screw to specified idle RPM. Manual transmission should be in neutral, automatic transmission in drive.

Engine ⁽¹⁾

Synchro mesh

Auto. Trans.

307"

900

600

350" (Exc. Z-28)

900

600

400", 402" & 454" (All)

750

600

350" Z-28

900

700

⁽¹⁾	Idle Adjustment for cars equipped with A.I.R. is 1/4 turn rich from lean roll (mixture screw). After final adjustment, install service mixture screw limiter caps.

RENDER: 1.0x

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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.