A B737 CREW; CLBING THROUGH FL300; EXPERIENCED AN UNIDENTIFIABLE ODOR THROUGHOUT THE ACFT; RETURNED TO MKJP.

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DEPARTED KIN AS FLT XXXX; FO'S LEG. NORMAL DEP WITH NO ABNORMALITIES NOTED ON PREFLT OR WITH DEP. CLBING OUT OF FL300; FLC SMELLED A STRONG ODOR COMING FROM THE REAR OF THE ACFT. INITIALLY THE CREW DID NOT HAVE TROUBLE BREATHING OR SEEING. THE FLT ATTENDANT ADVISED THE ODOR WAS NOT COMING FROM THE GALLEY AND THAT PAX WERE COMPLAINING ABOUT THE ODOR ALL OVER THE CABIN. AS PER THE PREDEP BRIEFING; CAPT BEGAN ABNORMAL PROCS CHKLIST TO RECTIFY THE SIT. WITH THE CAPT'S CONCURRENCE; I NOTIFIED KINGSTON THAT WE WERE DETECTING AN ODOR IN THE COCKPIT AND WOULD LIKE CLRNC TO RETURN TO KINGSTON. DECISION TO RETURN TO KINGSTON VERSUS MONTEGO BAY WAS MADE SINCE NEITHER FLC MEMBER WAS FAMILIAR WITH THE ARPT AND PLANNING TO LAND WOULD HAVE REQUIRED MORE TIME. KINGSTON ACKNOWLEDGED OUR EMER AND GAVE IMMEDIATE CLRNC TO RETURN TO THE FIELD. WE RECEIVED PRIORITY HANDLING AS AN EMER ACFT. THE ARR AND LNDG INTO KINGSTON WERE NORMAL. ACFT WAS INSPECTED BY ARFF EQUIP AND DETERMINED TO BE SAFE TO TAXI TO THE GATE. ARFF WAS NOT ABLE TO COMMUNICATE WITH THE ACFT AND WOULD RECOMMEND THAT THIS BE CHANGED FOR FUTURE EMERS. PAX WERE DEPLANED VIA AIRSTAIRS SINCE NO EVIDENCE OF DANGER EXISTED. AFTER INSPECTION BY THE MECH; THE FLT RETURNED TO MIAMI WITHOUT FURTHER INCIDENT. NO CAUSE FOR THE ODOR/FUMES WAS FOUND. TECHNICIAN ADVISED THAT IT WAS POSSIBLY THE #2 ENG WHICH HAD RECENTLY BEEN REPLACED. CREW COORD AND EXECUTION WAS EXCELLENT.