Q: Car reluctant to accelerate as if not getting power

asked by on

Recently I started having an issue with my car when I try to accelerate it seems reluctant to do that. The check engine light came on and the code read Po404 and also there was something about misfires. I got the EGR valve replaced but it didn't solve the problem. One thing I have noticed is that the problem goes away after driving the car for about 15 minutes.

Thank you in advance for any advice.

My car has 143000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. Let me start by explaining one of the strong possibilities concerning the misfiring. When the EGR valve malfunctions, the engine cylinders can combust prematurely. The computer will then detect the issue and label it as a misfire. Another issue you may want to check would be the passages around the EGR valve. There can be a deposit of carbon in the valve that can cause the valve to malfunction. If these were not cleaned thoroughly when the EGR valve was replaced, then the problem would still exist. Considering the fact you just got the repair done, you may want to trace over their work and verify the repair is still holding. A wiring issue would also cause this code to set, and cause issues with the valve in the first place. Here at YourMechanic, we can have a technician come to your home or office to inspect and diagnose this issue for you, and make or suggest the necessary repairs.

Was this answer helpful?
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. Car reluctant to accelerate as if not getting power

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: Engine sluggish, hesitates during accleration

Hello. A flashing Check Engine Light on your vehicle typically indicates that there is an engine misfire. This can occur from a failing spark plug or more commonly a clogged or failing fuel injection unit. I typically check the spark...

Q: Q: Car dies when I stop

Hi there. Stalling can be caused by a number of things, anything from a vacuum leak, to a problem with one of the engine's sensors or fuel system. As engine performance problems, such as these, are sometimes not obvious to...

Q: Car stalls and P0401 insufficient egr flow

The P0401 code is for low EGR flow, but would not be the cause of the stalling if the flow was too low. You also state the problem is when the engine is cold and goes away after it 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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...