OK ,, HERE WE GO ON THE C223 TURBO IT IS OF COURSE A NON INTERCOOLED DSL ,, ON AN INTERCOOLED DSL THE GENERAL METHOD IS TO TAKE THE PRESSUREIZED AIR FROM THE TURBO OUT PUT THAT IS NORMALLY GOING INTO THE INTAKE MANIFOLD AND RUNNING THIS OUTPUT TO A LARGE MAYBE 2-3 INCH THICK AND MAYBE 10-12 INCH SQUARE ALUMINUM RADIATOR, AND PLACE THIS UNIT IN AN AIR STREAM , THIS IS TO COOL DOWN THE AIR FROM THE TURBO GOING INTO THE ENG ,AND CAN DROP THE INCOMING AIR TEMP BY A CONSIDERABLE AMOUNT , AND THE MORE DENSE THE AIR THE MORE IT CAN BE COMPRESSED AND AS A RESULT THE MORE POWER ,, ON THE SIDE OF THE INJ PUMP THE SOLONOID IS NOT,, IT IS MOUNTED ON THE BACK OF THE PUMP UNDER THE INJ LINES , THAT UNIT ON THE SIDE IS THE TACH PICKUP AND IT WILL ONLY PRODUCE ABOUT 1 VOLT, VERY LOW VOLTAGE AND IT OF COURSE WILL FLUCTUATE WITH ENG SPEED , DO NOT APPLY VOLTAGE TO THIS UNIT OR IT WILL KILL IT ,, IF YOU CAN UNPLUG THE SOLONOID ON THE BACK OF THE PUMP AND THE ENG STILL RUNS AT IDEL, THE SOL IS STUCK OPEN OR SOMEONE HAS REMOVED THE PLUNGER, BUT THIS SHOULD NOT CAUSE A RUNAWAY, THE PUMP CANNOT PRODUCE THAT MUCH FUEL ON IT,S ON WITHOUT THE THROTTLE VLV BEING OPENED AND AT CLOSED THROTTLE IT ALLMOST HAS TO HAVE AN OUTSIDE INFLUENCE, AT LEAST AS FAR AS I HAVE EVER SEEN ONE DO ,IT IS ALLMOST ALLWAYS AND OUTSIDE SOURCE OF FUEL INGESTED INTO THE ENG EITHER FROM A BAD TURBO SEAL OR AN OVER FILLED CRANKCASE THAT IS FORCING ENG OIL INTO THE INTAKE SYSTEM ,, IF THE TURBO SEAL HAS GONE AWAY THE INLET OF THE INTAKE MANIFOLD MAY OR MAY NOT BE COVERED IN OIL, AS IT DOESNT TAKE A LOT OF EXCESS FUEL (ENG OIL)TO CAUSE A RUNAWAY , THE INJ PUMP TIMING BY ITSELF SHOULD NOT CAUSE A RUNAWAY, THIS ONLY DETERMINES WHEN THE INJ CYL TAKES PLACE ,BUT CAN HAVE A SIGINIFICANT EFFECT ON ENG NOISE , WHAT YOU ARE PROB, HEARING IS COMMONLY CALLED FUEL KNOCK, ALLSO WHEN A RUNAWAY OCCURS IT SHOULD START SMOKING LIKE A FREIGHT TRAIN AND BE COMPLETELY BLACK ,WITH MAYBE A HINT OF BLUE TINGE TO IT , BUT MIXED WITH DSL FUEL AND ENG OIL IT GENERALLY IS ALL BLACK SMOKE ,, THE PROB, IS THERE IS NO REAL EASY WAY TO SEE THE SEAL LEAKING WITH REMOVING AND DISSASENBLING THE TURBO ITSELF AND INSPECTING THE CENTER UNIT ITSELF AND PRESSUREIZING IT WITH ABOUT 60-80 PSI. OIL PRESS AND SEE IF THE SEAL START LEAKING INTO THE INTAKE PASSAGE,, SOMETHING ELSE TO CHECK, ON PULL THE LOWER OIL DRAIN HOSE FROM THE TURBO WHERE IT SNAKES DOWN TO THE CRANKCASE AND INSTALL A LARGE LONG PIECE OF RUBBER HOSE ON THE DISCHARGE PIPE , FOR THIS TEST A PIECE OF HEATER HOSE WILL WORK AND PUT THE END IN A BUCKET AND START THE ENG AND SEE HOW MUCH DISCHARGE FLOW THERE IS , IT SHOULD REALLY GUSH OUT , IT IS POSSIABLE THAT THE RETURN LINE INTO THE CRANK CASE OR THE HOSE LEADING TO THE CRANKCASE COULD BE RESTRICTED AND CAUSING THE OIL TO BACK UP IN THE TURBO AND CAUSING THE SEAL TO LEAK , IT HAS TO GET AWAY FORM THE TURBO FAST , THE INLET PIPE IS ABOUT 1/8 INCH AND HE OUTLET PIPE IS AT LEAST 5/8 SIZE HOSE .. NOW THERE IS ONE OTHER THING THAT CAN CAUSE THE ENG TO RUNAWAY BUT IT IS NOT TOO COMMON, A COUPLE OF BADLY SCORED UP CYL WALLS , AND THEN THE RINGS CANNOT CONTROL THE OIL AND IT GETS PAST THEM RIGHT INTO THE COMBUSTION CHAMBER AND AWAY WE GO JERRY