Q: My car is losing power, and I can't figure out what is wrong - 2006 Ford Fusion

asked by on

Car started missing and losing power. Got it home have changed spark plugs egr valve pcv valve checked convertor done compression test and still now change. Car sounds horrible and runs horrible. Have also checked coils and for vacuum leaks

Hopefully, there are diagnostic trouble codes stored. If not, a scope (for instance, an oscilloscope) diagnostic is needed to see exactly what is going on within each cylinder. With a scope you can determine if you have a random lean misfire, which points to an air leak or fuel supply issue, or you could have an issue related to just one or a couple cylinders.

Without such a diagnostic, you could check out the more common faults on that engine including a defective Delta Pressure Feedback EGR (DPFE) sensor, problems with the Variable Valve Timing solenoid, a dirty mass airflow sensor, vacuum leaks in the intake manifold or vacuum connections.

Regarding vacuum leaks, a smoke machine is often required to find vacuum leaks in the intake plumbing. Another possibility is problems in the fuel delivery system such as a restriction in the fuel pump (there is no serviceable fuel "filter" on your model) or inadequate fuel pump pressure and regulation. A scope would help rule out or confirm such issues.

I recommend having a certified mechanic, such as one from YourMechanic, perform an inspection to determine why your car is losing power and suggest any necessary repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. My car is losing power, and I can't figure out what is wrong - 2006 Ford Fusion

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: Q: Bad Spark Plug

Hi David, Yes, you are correct in that spark plugs 4 and 5 are in the front of the motor. When standing in front of the vehicle facing the motor, going from left to right the cylinders are numbered 4,5,6...

Q: car lost power when driving and had to tow it home.

Hi there. Your vehicle may need a tune up. Check the air filter, spark plugs and wires. If they are the original parts, I recommend replacing them with OEM parts. Also check the idle air control valve (IAC) and see...

Q: Smoke from underneath the hood.

If the leak is on the drivers side of the car, near the front of the engine, then your oil filter or filter housing may be leaking. You did not mention how much oil is leaking or what system is...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...