A LOW TIME C182 PVT PLT RUNS INTO BAD WX CONDITIONS; PICKS UP ICING; RUNS INTO WINDSHEAR NEAR THE ANTELOPE VALLEY HILLS; HAS A SPD BLEED PROB AND DIVERTS FOR A PRECAUTIONARY LNDG AT BFL; CA.

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I WAS ON AN IFR FLT FROM OAK TO WJF. EVENTUALLY; I WAS CLRED TO 11000 FT. 50 NM N OF SHAFTER; I BEGAN TO PICK UP LIGHT RIME ICING. I CHKED THE MEA/MORA AND REQUESTED LOWER. I WAS CLRED TO 9000 FT. ICING STOPPED BUT DID NOT EVAPORATE/SUBLIMATE. OUTSIDE AIR TEMP WAS -1 DEG C. I DID NOT WANT TO CARRY ANY ICE OVER THE RIDGE N OF WJF; SO I AGAIN CHKED MEA/MORA AND REQUESTED 7000 FT UNTIL SHAFTER. I WAS GIVEN BLOCK CLRNC 7000-9000 FT AND INSTRUCTED TO CLB BACK TO 9000 FT BEFORE 15 NM S OF SHAFTER. I DSNDED TO 7000 FT AND THE ICE QUICKLY CLRED. AT SHAFTER; I CLBED AT 500 FPM BACK TO 9000 FT. I LET MYSELF BECOME A LITTLE DISTR LISTENING TO A VFR PLT STUCK ABOVE THE LAYER OVER BAKERSFIELD AND WAS SHOCKED TO DISCOVER LIGHT ICING AROUND THE AIR INTAKES ON BOTH WINGS. I BEGAN FIXATING ON THE ICING; ALTHOUGH IT WAS QUITE LIGHT. I WAS CONSIDERING TURNING BACK TO BFL WHEN MY AIRSPD PLUMMETED. I VISUALLY CHECKED THE PITOT TUBE AND PULLED THE ATT STATIC. I FELT THAT IT WAS WINDSHEAR; BUT I WAS IN IMC AND DID NOT WANT TO TRUST MY SENSES BLINDLY. MP AND RPM INDICATED NO CHANGE. I ASKED BFL APCH ABOUT LOWER; AND WAS TOLD 9000 FT IS MVA. THEY SUGGESTED JOSHUA MIGHT BE ABLE TO HELP. I SWITCHED TO JOSHUA; THINKING THAT ANTELOPE VALLEY SHOULD BE CLOSE; BUT COULD NOT ESTABLISH RELIABLE COM. I WAS CONCERNED THAT MY HIGH ANGLE OF ATTACK WOULD ALSO CREATE AN ICING RISK; SINCE MORE OF THE WING IS POTENTIALLY ICED. SUDDENLY I WAS IN MODERATE TURB. UNABLE TO HOLD ALT; I STARTED A 180 DEG TURN. MY THINKING WAS THAT AT LEAST BFL COULD HEAR ME AND PERHAPS VECTOR ME TO LOWER TERRAIN. IN THE TURN WE BROKE INTO VMC AND I IMMEDIATELY TURNED TO A VALLEY HEADING WEST. WHEN THE TURB SUBSIDED; I DSNDED TO 5500 FT TO MAINTAIN VFR SEPARATION FROM THE CLOUD LAYER AND EXPLAINED TO BFL WHAT I WAS DOING AND ASKED FOR VECTORS TO BFL. I REPORTED THE EVENT AS A MICROBURST. AT BFL I LOOKED AT RADAR AND SAW NO CELLS; BUT I AM CONVINCED THAT THE OCCURRENCE WAS EITHER CONVECTIVE OR A MOUNTAIN WAVE FROM THE RIDGE. NO SIGNIFICANT ICE FOUND FROM PROP OR AIRFRAME AFTER DSNDING. BUT THE REAL PROB WAS JUDGEMENT. I SHOULD HAVE REALIZED THAT MY ORIGINAL PLAN WAS FLAWED. I KNEW THAT THE WEATHER MIGHT WORSEN ON THE RIDGE. THAT IS WHY I WANTED TO START ICE FREE. MAKING THINGS WORSE WAS MY FIXATION ON INDIVIDUAL EVENTS. IT DELAYED MY DECISION MAKING WORSE. I LOST SITUATIONAL AWARENESS. I SHOULD HAVE REALIZED ANTELOPE VALLEY WAS TOO FAR INSTEAD OF TAKING THE EARLY HDOF. HAD I KEPT AWARE; INSTEAD OF LISTENING TO SOMEONE ELSE NOT LOOKING FOR ICE; I WOULD HAVE 180'D EARLIER; BEFORE THE SITUATION DETERIORATED.