since 1940

Shudder in Lycoming aircraft engine

2. Improper carburetor nozzle. Slight hesitation or stumble on acceleration. For O320-E2D engines in Cessna 172's, and Piper PA-28-151's, and O-320-E2G installed Grumman AA5 and AA5A, refer to Lycoming Service Instruction 1305C. 3. Water or ice ingestion.

4. Induction air leak causing lean mixture.

5. Lean mixture.

6. Air leak in the fuel system. Replace a length of fuel hose with clear hose and ground run the engine. Look for air bubbles in the fuel.

7. Cessna 172 Avcon Conversion. Lycoming O-360. Lean misfire due to lousy fuel distribution from air box design. O-360's in this installation require a richer carburetor jetting than standard. Carburetor p/n should be 10-4164 rather than 10-

8. Power interruptions in the IO-360-L2A engines used by the 172R were related to a combination of over-rich operation and fuel system vapor formation during prolonged ground operations in summer heat. Service Instruction #1498 states that "vapor may form in the fuel system during ground operations when the ambient temperature exceeds 85 degrees F,"  An alternative theory is that water is being trapped in the integral wing tank.

9.Water ingestion into engine. Water is being trapped in the integral wing tank

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