Skip the auto shop - Our mechanics make house calls

Q: Unable to go past 70-80 Km when going up a hill. Code P0174 with flashing engine light

asked by on

I recently got the P0174 code and the engine light also flashes some of the time (misfire?). I have a Ford Taurus 1998.

The car runs fine except when I go up a hill it lacks power and cannot go past 70-80Km and if I give it more gas it does not increase in speed but instead goes into high RPM (around 4000). Maybe downshifts? Car runs fine on flat ground. I also have higher fuel burn then usual but haven't noticed any fuel leak. I do smell a bit of gas from the engine when it's running, but it's an old car so maybe it's normal?

So far I have cleaned the MAF, changed the gas filter, changed the spark plugs, put fuel injector cleaner, replaced the air filter and replaced a couple vacuum hoses that were getting old. The car now idles better then it used to but the engine light and lack of power going up a hill hasn't gone away.

My car has 250000 miles.
My car has an automatic transmission.

Hello. A flashing Check Engine Light is an indicator that the computer has detected an issue that may potentially cause harm to the vehicle’s emission system components. The code P0174 indicates a lean condition on bank 2 of the engine. A lean condition is when there is insufficient fuel being delivered to the engine. This will cause misfires, hesitation, loss of power, but is also dangerous to the engine, as a lean condition can lead to detonation. A lean condition can be caused by many things. A few things I would check are the fuel pump, injector, and the MAF and oxygen sensor signals. If you need a diagnostic to be done in person, a certified technician from YourMechanic can come to your location to inspect the loss of power problem and advise on proper 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
  • Home
  • Questions
  • Unable to go past 70-80 Km when going up a hill. Code P0174 with flashing engine light

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: I keep getting OBD-II codes P0171 and P0174

Since you have codes that both banks are lean then the problem will most likely be from air entering the intake manifold after the mass air sensor. The idle air control valve should not have any air leaks from the...

Q: Shuddering and check engine lights blink so

This may be a sign of a dirty or failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected...

Q: Does my car need a clutch replacement?

Hi there. It sounds like the clutch is slipping; similar to when an automatic transmission slips. The clutch disc provides the friction surface that allows the transfer of engine torque to the transmission. It accomplishes this by riding on the...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.