Narrative:

On climb out from ZZZ, in the vicinity of lanna intersection, leveling at approximately 14000 ft, discovered #1 throttle would not retard past approximately 85% N1 (throttle forward movement was normal). Appeared to be something jamming the throttle. (First officer was the PF.) all engine parameters were normal. Checked the QRH for procedure, but there was none. Attempted to evaluate and troubleshoot by turning off autothrottle, checking circuit breakers, and attempted to free the throttle -- all unsuccessful. Declared emergency, advising ATC of stuck throttle and requested continuing climb to prevent overspd. Leveled off at 17000 ft. Determined we could maintain approximately 300 KT minimum at this altitude, with #2 reduced. ZZZ return was not an option due to distance, WX (IMC on 1 engine), turbulence, and traffic flow (landing to the south). ZZZ1WAS requested initially. ATC said only runway 35 available (short runway). Requested vectors for ZZZ (long runways, VFR). Briefed 'a' flight attendant. Made PA advising of precautionary shutdown and diversion. Contacted ZZZ and told them to contact maintenance (no time for me to contact maintenance directly). Performed engine shutdown per QRH at XA45Z. Approaching ZZZ, I assumed control, and landed without further incident. Contacted maintenance at block-in.

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Original NASA ASRS Text

Title: A B737 LEVELING OFF AT 14000 FT FOUND #1 THROTTLE STUCK AT 85% N1. DECLARED EMER AND DIVERTED. ENG SHUTDOWN.

Narrative: ON CLBOUT FROM ZZZ, IN THE VICINITY OF LANNA INTXN, LEVELING AT APPROX 14000 FT, DISCOVERED #1 THROTTLE WOULD NOT RETARD PAST APPROX 85% N1 (THROTTLE FORWARD MOVEMENT WAS NORMAL). APPEARED TO BE SOMETHING JAMMING THE THROTTLE. (FO WAS THE PF.) ALL ENG PARAMETERS WERE NORMAL. CHKED THE QRH FOR PROC, BUT THERE WAS NONE. ATTEMPTED TO EVALUATE AND TROUBLESHOOT BY TURNING OFF AUTOTHROTTLE, CHKING CIRCUIT BREAKERS, AND ATTEMPTED TO FREE THE THROTTLE -- ALL UNSUCCESSFUL. DECLARED EMER, ADVISING ATC OF STUCK THROTTLE AND REQUESTED CONTINUING CLB TO PREVENT OVERSPD. LEVELED OFF AT 17000 FT. DETERMINED WE COULD MAINTAIN APPROX 300 KT MINIMUM AT THIS ALT, WITH #2 REDUCED. ZZZ RETURN WAS NOT AN OPTION DUE TO DISTANCE, WX (IMC ON 1 ENG), TURB, AND TFC FLOW (LNDG TO THE S). ZZZ1WAS REQUESTED INITIALLY. ATC SAID ONLY RWY 35 AVAILABLE (SHORT RWY). REQUESTED VECTORS FOR ZZZ (LONG RWYS, VFR). BRIEFED 'A' FLT ATTENDANT. MADE PA ADVISING OF PRECAUTIONARY SHUTDOWN AND DIVERSION. CONTACTED ZZZ AND TOLD THEM TO CONTACT MAINT (NO TIME FOR ME TO CONTACT MAINT DIRECTLY). PERFORMED ENG SHUTDOWN PER QRH AT XA45Z. APCHING ZZZ, I ASSUMED CTL, AND LANDED WITHOUT FURTHER INCIDENT. CONTACTED MAINT AT BLOCK-IN.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.