System Spark Test

NOTE: Do not perform this test on Mercedes-Benz vehicles. Use an oscilloscope to check spark results on Mercedes-Benz.

Fig 1: Wiring Diagram of Typical Bosch Electronic Ignition System

Courtesy of NOT AVAILABLE

If Starter turns, but engine will not start or it fails to develop sufficient power, hold distributor end of coil wire about 3/8" (10 mm) from engine block and crank engine. See Fig 2.

Fig 2: Coil Wire Hookup For Making an Ignition System Spark Test on All Models Except Mercedes-Benz
Courtesy of NOT AVAILABLE
If spark jumps gap, check distributor cap, rotor, cables and spark plugs. Be sure ignition timing and fuel system are OK. If no sparks occur, perform the following tests