Buick Repair Questions? Ask a Mechanic for Answers ASAP
perform a cylinder drop test at idle and determine which cylinder/s is/are misfiring first. Instead of getting shocked pulling off spark plug wires, try this method. You will need some vacuum hose, the size that will fit snugly over the distributor cap towers, then cut the vacuum hose up into 8 equal pieces about 2-3 inches long each.
Most vacuum hoses will allow the voltage to flow, so set it up like this.
Now, mark all your spark plug wires at the cap or coil pack and remove them all. Put those short pieces of vacuum hose on the distributor cap or coil pack connections and shove the other end of the vacuum hose into the spark plug wire boot until it makes a good connection.
Then attach a 12 volt test light to ground, start the engine and touch each vacuum hose one at a time and kill each cylinder listening for the rpm to drop just slightly and also that the voltage will arc from the vacuum hose to the test light just incase the cylinder won't cause the rpm to drop you could also be checking for a spark at the cap.
Then when you determine which cylinder/s are misfiring, let me know.
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