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.

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.      

Volumetric Efficiency in MAF Diagnostics

Volumetric Efficiency (VE) is a measurement of the actual ability of the engine to move air versus how much it should be able to move theoretically.    

Tools to Manage False Air

Any leak in the air intake system after the MAF sensor will affect your GPS measurements and the fuel trim. There are many tools you can use to discover even small or difficult to see leaks.      

How a PCM is Affected by an Inaccurate MAF Sensor

An inaccurate MAF sensor can cause all kinds of problems with the PCM. The PCM can set a modified PID while setting a pending DTC, or it may modify the fuel trim without setting a DTC at all.      

MAF Vacuum Leaks and Downstream False Air

MAF vacuum leaks and downstream false air cause the GPS (Grams per Second) readings to decrease. This happens because more air is getting into the engine than the MAF sensor is measuring resulting in a lean mixture.      

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