Continued from the previous page.
- Next, I visually inspect the spark plugs and spark plug wires.
- What I'm checking for is for cracks and/or carbon tracks and/or oil filling up the spark plug well.
- I also remove and visually inspect the spark plug cable's metal terminals and the ignition coil pack tower (that the spark plug wire is connected to) for visible rust, corrosion, wear and tear, etc.
- If everything above checks out OK, I then do an engine compression test on the ‘dead’ cylinder and at least 2 others (to be able to compare compression values).
- low cylinder compression is so often overlooked as a cause of a engine miss (misfire, ‘dead’ cylinder, etc).
- What I'm looking for is to see if any one cylinder is too worn out. If it's too worn out, it will always have 15% lower compression that the highest compression reading of the four.
- The following tutorial will help you test engine compression: How To Do And Interpret An Engine Compression Test.
- Check fuel injector resistance.
- So, if you've reached this point, it's because you now know that the ignition system is not the cause of the engine miss (misfire, ‘dead’ cylinder, etc.), you've also eliminated the cylinder's compression and so you now can start testing the fuel injector.
I want to emphasize again, that the key to finding out exactly what's causing the engine miss (misfire, ‘dead’ cylinder, etc.) is to find out which of the six cylinders is causing the problem and then eliminating or confirming that the ignition is at fault.
The last piece of the diagnostic strategy, is to test the ‘dead’ cylinder's compression to see if too low.
More Ford 3.0L And 3.8L Test Articles
Here are links to other articles that may be of help in troubleshooting your Ford 3.0L and 3.8L equipped vehicle that I've written. To see the articles in this Web Site, go here: Ford 3.0L, 3.8L Index Of Articles.
At easyautodiagnostics.com, you'll find the following articles:
- How To Test The Ford V6 Ignition Coil Pack.
- How To Test The Ignition Control Module (Older 3.0L And 3.8L With A Distributor).
- How To Test The MAF Sensor.
- How To Test The Throttle Position Sensor (TPS).
If this info saved the day, buy me a beer!