For more than a century, Delphi has had a passion for making the parts that help vehicles all over the world run better, longer and more efficiently. We partner with the world’s 25 biggest automakers. And with more than 170,000 employees in 44 countries, we have the resources, the reach and the OE expertise to create real-world innovations for the global aftermarket.

Establishing Ignition versus Fuel Misfires

When establishing an ignition versus fuel misfires, it’s important to check all the DTCs to determine whether you actually have a misfire condition.      

Examining Coil on Plug Patterns

How to examine the patterns of all the coils in a Coil-on-Plug system at once with a scope.      

Three Wire “Smart” C.O.Ps

An overview of the operational theory and application of three wire smart CoP (Coil-on-Plug) systems.      

Establishing an Ignition Power Supply

Testing the connection from the CoP to the power supply is essential, as a coil will not fire without a closed connection to the power supply.

Hands On: Determining Coil on Plug Misfires

How to diagnose coil on plug misfires. A detailed guide to diagnosing coil on plug misfires with a multi-meter.      

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