1987 gn, has no spark and i only have 5.1volts to both the cam and crank sensors, what supplies the voltage to these sensors? i have injector pulse.

Asked by Jun 10, 2013 at 03:43 PM about the 1987 Buick Grand National

Question type: Maintenance & Repair

this is a used car i'm repairing, 1987 buick grand national3.8l turbo. none of the coils have spark, i put in a new ignition module on the base of the coils and have power to the module. the check engine light works, but has no fault codes besides the 12 code. doing the flow chart i only get 5.1v to both the cam and crank sensors instead of the needed 6 to9 volts. what supplies this voltagetothese sensors?

7 Answers

58,785

Do you have power going to the ignition switch? -Jim

1 out of 1 people think this is helpful.

yes, and the engine cranks.

why? is there another power supply from the ignition switch thati should check?

58,785

Yes, in the crank position direct 12 volts DC is applied to coil directly from the starter solenoid through the ignition switch. But in the run position about 6 to 8 volts DC is applied to the coil through a resistor wire that is connected to the ignition switch as well. Try using a remote starter button & see if it will run. Put the ignition in the run position and crank it with the remote starter button. If it runs you most likely have a problem with the wiring at the starter. There are fuseable links down by the starter as well. I know one is for the headlights. If I remember correctly you have 4 total. Maybe 3, but anyhow check them to insure they didn't burn out. If one did, replace it. Sometimes they just get old and weak. If the new one burns out you have a short in that circuit. HTH. -Jim

135

THE COMPUTER CONTROLLED COIL IGNITION, CCCI, MODULE, SHOWS BOTH SENSORS, CRANK & CAMSHAFT SENSORS COMING FROM THE MODULE. CRANK HAS A DARK GREEN WIRE FOR POWER, AND A GRAY/RED WIRE FOR GROUND. (GROUNDS R VERY IMPORTANT). CAM SHOWS A GRAY/RED WIRE FOR POWER, ANA A BLACK WIRE FOR GROUND. NOTE: ALL R SOLID STATE, DONOT MEASURE RESISTANCE, (DAMAGE CAN OCCUR). YOUR IGNITION WIRE IS PINK/BLACK FROM MODULE TO ECM AND 10 AMP FUSE. AND TO MULTIPORT FUEL INJECTION, SPARK CONTROL, AND AIR FLOW SENSOR. NOW THATS GOOD TO KNOW, VERY IMPORTANT , YES ??? I SEE ONLY ONE FUSIBLE LINK TO THE ECM MEMORY. I ALSO SEE 5 FIVE WIRES FROM ECM TO IGNITION MODULE, GROUND IS BLACK/RED. POWER TO BOTH THE ECM, AND THEIGNITION MODULE COMES FROM YOUR IGNITION WIRE, THE PINK/BLACK WIRE.THE CCCI ALSO HAS A 10 AMP FUSE. HOPE THIS HELPS, ITS IN REFERANCE TO A 1987 BUICK GN, IN MY GARAGE AT HOME. GOOD LUCK, CHECK OUT THE KIRBAN PERFORMANCE.COM WEBSITE. I PURCHASED A BOOK, INFORMATION GUIDE, BY PETER HOFFMAN. GREAT BOOK, GET ONE, U WON'T REGTET IT. KEN

60

i have a 1987 grand national with no power to spark plug i change coil package still no power to spark

2 out of 2 people think this is helpful.
60

i have a 1987 grand national with no power to spark plug i change coil package still no power to spark and chance crank sensor still no spark

4 out of 4 people think this is helpful.

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