Skip the auto shop - Our mechanics make house calls

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

A: Hopefully, there are diagnostic trouble cod...

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 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・Save up to 30%

Get a quote

What others are asking

Q: Location of ignition relay on a Ford Taurus 2002

The starter relay should be located at #23 in your power distribution box. Be sure to verify this with your owner's manual. If that relay is good, you may have an ignition switch issue. Symptoms of either can be similar...

Q: I have a broken axle seal not the boot, but the seal on the transmission

Hi there. The issue you're describing is a common problem with many of Toyota's Prius Hybrids. In fact, several 2010 - 2013 models have factory recalls on some transmission seals. When the seal is leaking fluid, it can cause a...

Q: Starter keeps cranking

You have two starter relays. Check and change the starter relay on the inner fender near the battery. Follow the red battery cable to the inner fender relay and this should be your problem. If you are still having trouble,...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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.