B737-700
Flight Crew Last 90 Days 129; Flight Crew Type 300
Workload; Training / Qualification; Time Pressure
Aircraft Equipment Problem Less Severe
Aircraft Equipment Problem Dissipated; Flight Crew FLC complied w / Automation / Advisory; Flight Crew Returned To Gate; Flight Crew Took Evasive Action; General Maintenance Action
Aircraft
We were at the gate and the boarding took an extra 30 minutes because they boarded too many passengers for the flight. We were within 500 pounds of minimum fuel for the flight as of the current flight release. The Captain decided to taxi out single engine to conserve fuel. During the start of the number one engine we had a Start Valve Open light illuminate in the cockpit. We pulled over and accessed the QRH (Quick Reference Handbook). During this; another Company Pilot taxiing a different aircraft alerted us that smoke was coming out of the number one engine. Then the Engine Overheat Light illuminated. We switched checklists to the engine overheat checklist and shut the engine down. The Captain had Ground call the fire trucks and had me call Maintenance. He alerted the Flight Attendants and passengers. When the Fire Department arrived they visually inspected the engine and took temperature readings which were all normal. The Captain asked the Fire Department to follow us back to the gate and I got a gate. The fire trucks followed us back and we deplaned through the jet bridge without further incident.
We took a 30 minute delay because we had boarded one too many passengers. We pushed and I elected to single engine taxi. Upon taxi out; we started the number one engine. Upon engine rollback the Eng Start Valve did not close. We pulled over into the deice area and started the checklist.
After a delayed engine start off the gate; a B737-700 left engine starter valve failed to close. A passing aircraft reported smoke just as the engine overheat light illuminated. The engine was shutdown; the QRH completed and the crew taxied back to the gate with fire trucks in tow.