Why is My Ford Truck Shaking?

Your Ford truck’s ignition system is made up of a bunch of components that must all work together in perfect unison. If there is a flaw in the system, a good spark will not happen, which causes your vehicle to misfire. The shaking occurs as your truck’s engine struggles to remain running while at idle. A few common causes within the ignition system are:

Let’s look at these common culprits one at a time.

When your truck’s engine misfires, there may be more going on under the hood than you realize. There is a specific combination of an air/fuel mixture, plus a spark and compression needed to successfully run your vehicle’s engine. All of these components need to happen at the correct times, in the correct amounts to produce combustion. If even one of these components is out of sync or working improperly, your engine can misfire. Misfires result in your truck running rough, shaking while at idle and making that popping sound.

The ignition coil pack is another important component in the ignition system of your Ford truck. When they go bad, the symptoms can be very similar to faulty spark plugs. There will be a noticeable decrease in acceleration plus an increase in gas usage. Misfires may also become more frequent.

Another possible (but less common) reason your truck may be shaking, is worn out or broken motor mounts. These are brackets with rubber centers that hold your engine secure. They also help insulate the vehicle from the normal vibrations that occur while your engine is running. When the mounts become compromised you may notice a thumping or clunking noise when you accelerate, drive over bumps in the road or brake hard. 

Your truck’s transmission also has mounts that insulate the vehicle from the normal vibrations of its use. If your transmission has worn or broken mounts, excess vibrations there could cause a chain reaction to your engine, increasing the strain and movement of your motor mounts. These excess vibrations can lead to shaking in the engine compartment.

Vacuum leaks can be tricky to diagnose. Your truck’s engine creates a vacuum while running. If there is a compromise anywhere in the vacuum system, the result can be noticeable shaking while at idle. Check inside your engine compartment to see if you hear a hissing sound. If you do, you may have a leak in the vacuum system which should be diagnosed and repaired as soon as possible.

If your Ford truck is having any of these issues, take some notes on the when, where, and how often it happens to help the technician narrow down the usual suspects. A glowing check engine light is actually helpful in this situation. Running a diagnostic for trouble codes may find the culprit quickly and get you back in your truck and on the road.