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 PERFORMANCESYSTEMEXHAUST GAS RECIRCULATIONTESTINGEGR DELAY SYSTEM
1977 Dodge and Ram Pickup D300, 4D Pickup, 3.7L Eng VIN B, Automatic Trans
EGR Delay System
1977 Dodge and Ram Pickup D300, 4D Pickup, 3.7L Eng VIN B, Automatic TransSECTION EGR Delay System
- If equipped with delay system, stop engine, then restart. Immediately open throttle to approximately 1, 000 RPM and watch EGR valve stem for movement. If EGR moves during first 30 seconds after starting, EGR time delay system is defective.
- Check hose connections to time delay solenoid valve. If okay, detach electrical plug from solenoid valve and energize valve by grounding either terminal and connecting the other terminal to the positive battery post.
- If EGR valve stem moves on this test, solenoid valve is defective and must be replaced. If EGR valve stem did not move, EGR timer control should be replaced.
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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.