BMW 318

Defect: THE ADHESIVE MATERIAL OF THE TWO PIECE THROTTLE BODY HEATER MIGRATES INTO THE CIRCULATION CHAMBER CAUSING BUILD UP OF IMPURITIES AND RESTRICTION OF FLOW WITHIN THE CHAMBER. THIS CONDITION AND WATER VAPORS FROM THE CRANK THAT FREEZES AT LOW AMBIENT AIR TEMPERATURES PREVENTS THE THROTTLE PLATE FROM CLOSING AS THE DRIVER RELEASES THE GAS PEDAL, CAUSING LOSS OF THROTTLE CONTROL.

Risk: IF LOSS OF THROTTLE CONTROL FROM THE FROZEN THROTTLE BODY OCCURS WHILE THE VEHICLE IS IN MOTION, A VEHICLE CRASH COULD OCCUR.

Manufacturer fix: BMW DEALERS WILL REPLACE THE THROTTLE BODY HEATER WITH A MODIFIED HEATER.

Defect: FEED FUEL HOSES CAN HARDEN AND "SET" OVER TIME, ALLOWING A SEEPAGE OF FUEL AT THE CONNECTION BETWEEN THE HOSE AND THE ENGINE FITTING. THE CLAMP USED TO HOLD THE HOSE TO THE FITTING IS UNABLE TO COMPENSATE FOR THE HARDENING OF THE FEED FUEL HOSE.

Risk: FUEL SEEPAGE BETWEEN THE FEED FUEL HOSE AND THE ENGINE FITTING CAN RESULT IN FREE FUEL IN THE ENGINE COMPARTMENT, WHICH COULD RESULT IN A FIRE WHEN EXPOSED TO A SOURCE OF IGNITION.

Manufacturer fix: A REDESIGNED FEED FUEL HOSE AND HOSE CLAMP WILL BE INSTALLED TO ALLEVIATE THE FUEL SEEPAGE.

Defect: THE CRANKCASE VENTILATION SYSTEM, VENTED INTO THE INTAKE TRACT OF THE ENGINE AT THE BELLOWS BOOT AHEAD OF THE THROTTLE HOUSING, ALLOWS WARM WATER VAPOR FROM THE CRANKCASE VENT TO CONDENSE AND FREEZE IN THE COLDER BELLOWS BOOT WHEN THE AMBIENT AIR TEMPERATURE IS 15 DEGREES FAHRENHEIT OR LESS. THE BUILD UP OF ICE CAN DISLODGE AND MOVE INTO THE THROTTLE HOUSING, PREVENTING THE THROTTLE PLATE FROM FULLY CLOSING WHEN THE DRIVER RELEASES THE GAS PEDAL.

Risk: IF THE THROTTLE PLATE IS PREVENTED FROM CLOSING, THEREIS AN INCREASE IN IDLE SPEED AS WELL AS SLOWER THAN NORMAL DECELERATION, WHICHOCCURS WITHOUT PRIOR WARNING AND COULD RESULT IN AN ACCIDENT.

Manufacturer fix: REPLACE THE THROTTLE HOUSING WITH A VERSION CONTAINING A MODIFIED HEATING SYSTEM ALONG WITH REROUTING OF THE CVS HOSE. THIS WILL PREVENT ICE BUILD-UP IN THE INTAKE TRACT.

Defect: WATER CONTROL VALVE IN THE HEATING SYSTEM MAY NOT CLOSE COMPLETELY. EXCESSIVE CURRENT MAY BEGIN TO FLOW THROUGH THE WIRING TO THE CONTROL VALVE RESULTING IN OVERHEATING OF THE WIRING.

Manufacturer fix: WIRING TO THE VALVE WILL BE REPLACED WITH A WIRE CONNECTOR THAT HAS A FUSE. THE FUSE WILL PREVENT THE OCCURENCE OF AN ELECTRICAL OVERLOAD.

Defect: THE IDLE CONTROL VALVE WHICH CONTROLS IDLE SPEED BY VARYING THE AMOUNT OF INTAKE AIR THAT BYPASSES THE THROTTLE PLATE IS SUBJECT TO BACKFIRE INTO THE INTAKE MANIFOLD. SUCH BACKFIRE CAN DAMAGE THE VALVE AND CAUSE THE IDLE VALVE PLATE TO REMAIN OPEN. CONSEQUENCE OF DEFECT: THIS WILL RESULT IN ABNORMALLY HIGH IDLE SPEED.

Manufacturer fix: INSTALL A REDESIGNED IDLE CONTROL VALVE WHICH CAN NOT STICK OPEN.