Q: Engine runs rough and has a growl for a while then clears up after several miles.

asked by on

My 2002 Ford Focus SE. with the DOHC Zetec engine runs really rough and has loss of power. After running for a good while it will clear up and run smooth again, sometime after stopping and shutting off engine and restarting it.I had Autozone put on computer and there are no codes. I recently replaced PCV valve and tubing because hose was collapsing but this did not solve issue.

My car has 116000 miles.
My car has an automatic transmission.

Hi there. The PCV hose collapsing seems to be a common issue with this model vehicle; there appears to be an updated hose available that may need some investigation to acquire. I would replace the valve and hose together as simple preventive maintenance. The running rough with a loss of power will require a good diagnostic process since there are no stored codes. Were you able to check pending or history codes? Some small handheld scanners cannot read the pending or history codes. You could have ignition coil failure, worn spark plugs, leaking injectors, vacuum leak, or a mechanical concern. I suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. Your Mechanic has several technicians available that can assist you with a car loses power inspection.

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
  1. Home
  2. Questions
  3. Engine runs rough and has a growl for a while then clears up after several miles.

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: When starting car, alarms & warning lights flash

The cause of these random problems can be due to the wiring harness is having loose connection issues to the modules and ECM of the vehicle that causes erratic issues then are hard to explain and even harder to find....

Q: Transmission leak

Hi there. It's possible that a transmission line may have come loose or has a small hole which is causing the leak. It is also a possibility that the transmission oil pan gasket has worn out, causing the leak when...

Q: Do i need to add pag oil to my cars a/c system after the condenser is replaced.2002 Chrysler Town & Country

Hello. When replacing a part like the condenser it is a good idea to add some extra oil with the new refrigerant. Most refrigerants do have some oil in them which should be enough. The majority of the oil in...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...