PA30 pilot had rough engine, with power loss.

Attributes
ACN	416039
Time
Date	199809
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : isp
State Reference	NY
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90
Operator	general aviation : corporate
Make Model Name	PA-30 Twin Comanche
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 32 flight time total : 12500 flight time type : 800
ASRS Report	416039
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Detected slight left engine roughness and partial power loss. Noting a high fuel pressure, low egt, and no differential magneto drop, I diagnosed the problem as a clogged fuel injector. Elected to continue to home base at reduced left engine power. No emergency declared, or asked for most direct routing. ATC cooperated. Emergency equipment out at destination, though not requested by me. Had past experience with this type of engine anomaly.

Original NASA ASRS Text

Title: PA30 PLT HAD ROUGH ENG, WITH PWR LOSS.

Narrative: DETECTED SLIGHT L ENG ROUGHNESS AND PARTIAL PWR LOSS. NOTING A HIGH FUEL PRESSURE, LOW EGT, AND NO DIFFERENTIAL MAGNETO DROP, I DIAGNOSED THE PROB AS A CLOGGED FUEL INJECTOR. ELECTED TO CONTINUE TO HOME BASE AT REDUCED L ENG PWR. NO EMER DECLARED, OR ASKED FOR MOST DIRECT ROUTING. ATC COOPERATED. EMER EQUIP OUT AT DEST, THOUGH NOT REQUESTED BY ME. HAD PAST EXPERIENCE WITH THIS TYPE OF ENG ANOMALY.

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.