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 MANUALSDODGE AND RAM1977PICKUP D300, 4D PICKUP, 3.7L ENG VIN B, AUTOMATIC TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEMSEXHAUST EMISSION SYSTEMSDESCRIPTIONNOTES
1977 Dodge and Ram Pickup D300, 4D Pickup, 3.7L Eng VIN B, Automatic Trans
Exhaust Emission Systems: Description: Notes
1977 Dodge and Ram Pickup D300, 4D Pickup, 3.7L Eng VIN B, Automatic TransSECTION Notes
Control of exhaust emissions is accomplished by a combination of engine modifications and special system components. Component usage varies according to model, engine, state, and emissions application.
NOTE:
There are 2 Light Duty truck emission control standards classifications: Light Duty and Heavy Duty. Light Duty refers to vehicles up through 8, 500 lbs. GVW; Heavy Duty refers to vehicles over 8, 500 lbs. GVW.
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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.