Skip the auto shop - Our mechanics make house calls

Q: Cam phaser symptoms? 2006 Ford F-150

asked by on

What are symptoms of failed cam phasers?

My car has 155000 miles.
My car has an automatic transmission.

Noise and/or failure of the variable cam timing phasers is a well known issue on the 5.4L V-8. In 2006, Ford issued a technical service bulletin, denoted TSB 06-19-8, to explain the service and repair procedures to deal with the noise.

Typically, worn phasers create a loud and rough idle. Often, a knocking noise is heard. In some instances, the noise is not due to wear in the phasers but rather low oil pressure due to cam bearing wear in the cylinder heads. If that is the case, the heads may need to be replaced or machined.

See the TSB for specific instructions but additional reported fixes have included installing a high volume oil pump. That has has the effect of increasing oil flow to the cam phasers. Some owners have also tried locking the phasers at base timing via installation of plugs that prevent the vanes from moving but this is not recommended as it defeats the VVT capability and the PCM would have to be custom re-programmed.

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: Car started clicking before dying

A faulty camshaft sensor will definitely cause the Check Engine Light to illuminate; there will most likely be a fault stored for it, if it is, indeed, faulty. All other fault codes will need to be read out as well....

Q: A/c not working

There is a technical service bulletin that may pertain to your Toyota Camry T-SB-0205-12. This calls for replacement of the car's cooling fans and a reprogram of the engine computer. The fans may not come on sometimes and make the...

Q: squealing, losing power

Hello. From the symptoms you describe, it sounds like you may have some sort of mechanical failure. A squealing sound can be caused by many things, but none really that should cause your vehicle to lose power, unless the sound...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.