Misfire Archives - UnderhoodService
Misfire Codes P0300, P0301-P0312 and P0313+P0314

The only way to clear the code is to use a crankshaft position relearn with a scan tool.

Mercedes Ignition Coil Pack Diagnostics

Replacing a single coil might not be the best approach to curing an engine of a chronic misfire.

Diagnosing An Engine Misfire P0316 Code (Video)

Code P0316: Engine Misfire Detected on Startup (First 1000 Revolutions) could have many causes. Sponsored by Autolite.

Chasing The Perfect Combustion Event

The perfect internal combustion engine would put the exact amount of fuel and air into the combustion chamber.

Gapping Spark Plugs

For modern fine-wire spark plugs, you should not measure the gap unless instructed by the manufacturer.

Pulling Codes: Multiple Misfire Personalities

The vehicle appeared to run fairly well at idle, but when taken for a test drive, did not perform well. We crack the code.