ignition Archives - UnderhoodService
Forcing OBD II Vehicle Emission Monitors

Some vehicles have readiness issues when it comes to setting all the OBD II monitors.

It’s Got Spark!

Why can’t you trust some spark tests?

Do You Know The Cause Of A No-Spark Condition?

A no-spark condition could be the result of communication errors or missing data from a dead module.

Spark Plug Evolution

Spark plugs have changed over the years.

Spark Plug Replacement

Here are some tips to follow when replacing a spark plug.

Five Spark Plug Service And Replacement Tips

Most articles will tell you to use a torque wrench, but they never explain why.

No Go? Battery and Starter Diagnostics

What seems like a problem with one could be an issue with the other.

Diagnosing Driveability Problems

Understanding what comes out through the exhaust valve is critical to solving any emissions or driveability problem.

Spark Plug Removal Techniques On Ford Modular Engines

Ford’s Modular engine has been known to give techs a hard time during a spark plug replacement. 

Ignition And Coil Flashover

If you see carbon tracking or “flash over” on a spark plug, boot or coil, it is not normal.

Ignition Coil Service: Start To Finish (VIDEO)

Diagnostics depends on the coil’s design and what wires are in the connector. Sponsored by Standard Motor Products.

VIDEO: Navigating the Ignition Coil Connector

Always check the wiring diagram to confirm the connections to the coil. This video is sponsored by Standard Motor Products.