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 RAM1977RAM WAGON B300, VAN PASSENGER EXTENDED, 7.2L ENG VIN DREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMEXHAUST GAS RECIRCULATIONTESTINGEGR SYSTEM OPERATION
1977 Dodge and Ram Ram Wagon B300, Van Passenger Extended, 7.2L Eng VIN D
EGR System Operation
1977 Dodge and Ram Ram Wagon B300, Van Passenger Extended, 7.2L Eng VIN DSECTION EGR System Operation
- Place transmission in Neutral and set parking brake. Start engine and allow engine to reach normal operating temperature. Quickly accelerate engine to approximately 2, 000 RPM while watching EGR valve stem. Stem should move when engine is accelerated. If not, refer to TROUBLE SHOOTING in this article.
- Once EGR valve movement has been obtained, it is necessary to determine if EGR is actually taking place. Disconnect vacuum hose at EGR valve. Using a length of vacuum hose and an external vacuum source, apply 10 in. Hg or greater vacuum to EGR valve while engine is idling. Engine idle speed should drop a minimum of 150 RPM or stall. This indicates EGR is flowing properly.
- If speed does not change or change is less than minimum, exhaust deposits are in EGR valve or intake manifold passages. Remove valve for inspection and cleaning. Inspect manifold passages and clean as required.
NOTE:
When cleaning valve, do not allow cleaning solvents on diaphragm. Do not push on diaphragm to operate valve, use vacuum only.
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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.