Flight Crew Private
Flight Crew Last 90 Days 40; Flight Crew Total 1700; Flight Crew Type 1400
Situational Awareness; Troubleshooting
Aircraft Equipment Problem Critical; Inflight Event / Encounter Fuel Issue
Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft
On approach to landing; I discovered the throttle would not completely close resulting in too much power for a normal approach/landing. On very short final I turned off the engine and landed the airplane. When on the ground I notified the Tower that I had turned off the engine on short final and would be coasting off runway at Taxiway-F. I announced to the Tower that I had cleared Runway-32 and would attempt a restart to taxi to the FBO. On restart; the engine speed remained high as the throttle would not close completely. The Tower instructed me to taxi to the Ramp via Taxiways 'A' and 'E'; which I did without issue. Mechanical work [was] performed by an FBO over the next two days and resulted in the discovery of a detached Accelerator Pump Discharge tube in the carburetor and subsequent replacement with a factory overhauled carburetor. At no time was there an emergency situation; or a declaration of an emergency situation by the pilot.
A single pilot reports he had to turn off his engine in a C-170 aircraft on a very short final because the throttle would not close completely resulting in too much power.