The output voltage of a properly operating
camshaft position sensor or crankshaft position sensor switches from high (
5.0 volts ) to low (
0.3 volts )
Crankshaft Position Sensor
The crankshaft position sensor mounts to the engine block behind the generator, just above the oil filter.
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[IMG]file:///C:/Users/jason/AppData/Local/Temp/moz-screenshot-5.jpg[/IMG]
Notes 
NOTE: Coil one fires cylinders 1 and 4, coil two fires cylinders 2 and 3. Each coil tower is labeled with the number of the corresponding cylinder.
- Remove the ignition cables and measure the resistance of the cables. Resistance must be between ranges shown in chart in specification. Replace any cable not within tolerance.
- Disconnect the electrical connector from the coil pack.
Terminal Identification
- Measure the primary resistance of each coil. At the coil, connect an ohmmeter between the B+ pin and the pin corresponding to the cylinders in question. Resistance on the primary side of each coil should be 0.45 - 0.65 ohm . Replace the coil if resistance is not within tolerance.
Checking Ignition Coil Secondary Resistance
- Remove ignition cables from the secondary towers of the coil. Measure the secondary resistance of the coil between the towers of each individual coil. Secondary resistance should be 11,000 to 14,000 ohms . Replace the coil if resistance is not within tolerance.
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maybe some of this will help , its not likely to be the cam sensor it would still have spark with a bad cam sensor