Exhaust Gas RECIRCULATION: Testing: Notes

Every 12, 000 miles or 12 months, complete E.G.R. system should be inspected and tested. Check all hoses for damage or air leaks. All moving parts must be free from plugging or sticking as a result of deposits. With air temperature at 68°F or above, allow engine to idle in neutral, with carburetor throttle closed; then, abruptly accelerate engine to approximately 2000 RPM, but not over 3000 RPM. Visible movement of E.G.R. valve stem should occur. To determine movement of E.G.R. stem, watch for movement of groove on valve stem. Repeat test several times to assure system is operating properly. If engine is equipped with a delay system, perform following test: