Skip the auto shop - Our mechanics make house calls

Q: Experiencing rough idle and misfire on multiple cylinders on bank 2

asked by on

I have a 2004 Ford F150 and recently it has started with a rough idle and loss of power. I have a programmer so I can read all of my codes. I have about 12 codes. It started out with a camshaft position sensor issue on bank 2, and that was it. Now it has progressed to camshaft position sensor issues on both banks, camshaft position actuator issues on both banks, misfires on cylinders 5, 7, and 8, misfire on startup, random misfire detected, and a couple of other codes that has to do with the misfires. I have brand new spark plugs and brand new coil packs so I know that is not it. Both of the VCT solenoids are brand new, camshaft position sensors are brand new, and wiring on the sensors is brand new. I have tried everything that I know of to try, and now I'm lost.

My car has 280000 miles.
My car has an automatic transmission.

Hello, thanks for reaching out to us about your Ford’s rough iding and misfiring. Typically, when your vehicle is running with these codes and symptoms, it’s due to faulty camshaft phasers that need replacing, or the timing chain is worn out.

Defective camshaft phasers are a common problem and will cause the variable valve timing to be off just enough to cause rough idling or misfiring. I would fix the camshaft phasers first, and if symptoms still occur, I’d recommend replacing the timing chain (you will need to remove the timing cover to do so).

If you’d like help with either of these tasks, consider YourMechanic and a certified mechanic can come to your home or office to diagnose and repair these issues for you.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: lost all oil pressure, replaced the oil pump, low oil sensor, oil pressure sensor, oil pan gasket,

The fuel pump will not stay on if you loose oil pressure. This is why it is shutting off. The loss of oil pressure may be from bad crankshaft bearings or camshaft bearings. The engine oil pan should be removed...

Q: Whistle noise from air conditioner

Without hearing the noise myself I would say the noise is due to the blower motor is noisey and need to be replaced. The noise may be from debris in the blower motor and it needs to be cleaned out...

Q: What wires do I connect to the starter

The black and orange striped wire goes with the red wires behind nut with the big starter cable. The small, tan and red striped one goes to the small terminal. If you are still having trouble, a technician from YourMechanic...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...