For 1990-2009 cars

# RADIO STATIC-DIESEL MODELS CAUSE & CORRECTION

WE HAVE RECEIVED REPORTS OF RADIO STATIC ON CARS EQUIPPED WITH DIESEL ENGINES. THIS CONDITION MAY BE CAUSED BY SEVERAL COMPONENTS. BY FOLLOWING THE CHART BELOW THESE CORRECTIONS SHOULD ELIMINATE MOST CONDITIONS. 1.FROM GREEN LEAD ON VRV SWITCH TO GROUND. 2.FROM PURPLE OR BLUE LEAD ON VRV SWITCH TO GROUND. 3.FROM BLACK LEAD AT TRANSMISSION WEATHER PAC CONNECTOR TO TRANS. HOUSING GROUND. TRY CORRECTION FOR VRV 1 AT A TIME, YOU MAY NOT NEED TO INSTALL ALL 3 CAPACITORS. CONDITION SINGLE POP ON ACCEL. CAUSE EXHAUST PRESSURE REG. SOLENOID EPR CORRECTION INSTALL DIODE ACROSS SOLENOID. CONDITION BUZZING NOISE AS CAR ACCEL. CAUSE TORQUE CONVERTER CLUTCH SWITCH TCC CORRECTION INSTALL A 0.5 MFD CAPACITOR ON TCC LEAD AT FUSE BLOCK CONDITION RANDOM POPING WHILE ACCEL. SLOWLY OR MAINTAINING CONSTANT SPEED. CAUSE VACUUM REG. VALVE CORRECTION INSTALL 1.5 MICROFARAD ALTERNATOR CAPACITORS, PLACED AS NOTED IN STEPS 1 THRU 3. CONDITION FRYING NOISE AT HEAVY THROTTLE CAUSE VACUUM REG VALVE CORRECTION INSTALL 1.5 MICROFARAD ALTERNATOR CAPACITORS, PLACED AS NOTED IN STEPS 1 THRU 3.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.