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.

A: Hello, thanks for reaching out to us about ...

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

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: Camshaft failed two months after timing belt replacement

Although it is not extremely common for a camshaft to fail within the 100k mile range, it is not impossible. If indeed the camshaft has snapped or potentially has a bad bearing, this can in fact cause an enormous vibration....

Q: Rear Wheel has bearing/seal issue

Hi there. If you're going to attempt to replace the wheel bearings on your 2004 Jeep Liberty, I highly suggest purchasing a service and repair manual, as it will provide you with a detailed list of replacement parts, seals, gaskets...

Q: Front brakes lock up is that the ABS module or the pump

The ABS system should of been put into bleed function when bleeding out the brake lines or you may not be able to get all the air out of the system. This is most likely the cause of the rear...

Related articles

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.