Skip the auto shop - Our mechanics make house calls

Q: Truck shuddering at 45 to 50 MPH.

asked by on

My Ford F-150 has a shudder at 45 to 50 MPH under a light load. I think it could be an ignition coil or spark plug problem.

A shudder could be a problem with an ignition coil pack. On most cars they start to fail around 150,000 miles. I would have a technician come out and inspect the coils and you will probably get a p0300 code as well if it is misfiring. It could also come from a bad injector as well. A technician will be able to pull the codes to determine where to start looking for your problem.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Fuel rail once went bad. Driver side spark plugs good other side black. Fires up idles a few secs then shuts down.

You need to have the fuel pressure checked to see if the pressure holds steady when the key is cycling on and off. The pressure regulator may be leaking fuel into the intake flooding the three cylinders with fuel. Have...

Q: Car turns off while driving

Hi David. Thanks for contacting us today. Usually when a car acts this way, it's due to an electrical problem of some sort - either an exposed wire that causes a short in the ignition system or a fuel delivery...

Q: Loud popping noise where header and exhaust meet

Hi there - the "combustion bang" you hear taking place at the header flange probably indicates a leak at the donut gasket as you suspect. Unburned, or still burning, fuel catches some fresh oxygen at the flange, and ignites, producing...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.