A C172 pilot experienced a rough running engine and landed as a precaution at bur.

Attributes
ACN	450547
Time
Date	199909
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : vny.airport
State Reference	CA
Altitude	msl single value : 7500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	VFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 6 flight time total : 1250 flight time type : 800
ASRS Report	450547
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : landed as precaution
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On sep/xa/99, my wife and I departed camarillo with the destination of big bear airport, flying VFR. We were cruising at 7500 ft, about 5 mi west of vny airport when the engine began shaking. Power was reduced, socal approach was advised, and bur tower cleared us to land on runway 15. The landing was uneventful. It was discovered, upon removal, that the #3 cylinder had ingested its exhaust valve. A yellow tagged cylinder was installed at bur airport and the aircraft was flown back to camarillo airport.

Original NASA ASRS Text

Title: A C172 PLT EXPERIENCED A ROUGH RUNNING ENG AND LANDED AS A PRECAUTION AT BUR.

Narrative: ON SEP/XA/99, MY WIFE AND I DEPARTED CAMARILLO WITH THE DEST OF BIG BEAR ARPT, FLYING VFR. WE WERE CRUISING AT 7500 FT, ABOUT 5 MI W OF VNY ARPT WHEN THE ENG BEGAN SHAKING. PWR WAS REDUCED, SOCAL APCH WAS ADVISED, AND BUR TWR CLRED US TO LAND ON RWY 15. THE LNDG WAS UNEVENTFUL. IT WAS DISCOVERED, UPON REMOVAL, THAT THE #3 CYLINDER HAD INGESTED ITS EXHAUST VALVE. A YELLOW TAGGED CYLINDER WAS INSTALLED AT BUR ARPT AND THE ACFT WAS FLOWN BACK TO CAMARILLO ARPT.

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.