How to Diagnose a 2014 Chrysler Town & Country 3.6l with an Engine Misfire - P0300 P0305

A tricky misfire diagnosis is no match for Bernie. In this video he tackles a misfire on a 2014 Chrysler Town & Country (minivan) with a 3.6 liter engine. Spark plugs, fuel injectors and ignition coils have already been installed in the engine and those new parts did not remedy the problem.

When reviewing scan tool data, the engine is running rich (-33 on both banks) and low engine manifold vacuum (2.3 HG). There were two DTCs stored, P0300 Random / Multiple Cylinder Misfire and a P0305 Cylinder #5 misfire. The low engine vacuum is causing the fuel tirm issue. This engine is a speed density system., it used a manifold absolute pressure (MAP) sensor to determine load. With low vacuum, the ECM assumes there is a load and adds fuel.

Using eSCAN’s built-in relative compression test, two low cylinders are identified. Next, the eSCOPE with the low cylinders are identified using the built-in CKP Misfire detection tool. Cylinders 1, 3 and 5 are misfiring. Bank 1 (the right side of the engine) is misfiring. Tailpipe pulses help to confirm a timing issue and then finally the root cause is determined by testing cylinder pressure (using a pressure transducer), a faulty VCT (camshaft actuator / phaser control) and faulty piston rings (blow-by).

Diagnostic equipment used:
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