Q: Slow Acceleration of Vehicle after start up

asked by on

Check engine light is on, and after initial start up of vehicle, it is very slow to accelerate. I have 150k miles on this vehicle.

My car has 150000 miles.
My car has an automatic transmission.

Hi there. That check engine light is probably the warning that something is afoul and creating your concern. There are more than likely codes and data stored to aid in the diagnosing of the concern. Remember that codes are not a diagnosis, they lead the technician to the are that is in need of the inspection. The computer sees a fault, but does not know what, how, or why the fault has appeared. I suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. Your Mechanic has several available technicians that can assist you with a check engine light inspection.

Was this answer helpful?


When your vehicle is slow to accelerate, it’s typically caused by the engine’s ability to efficiently burn fuel. This can be caused by dirty mass air flow sensor, faulty fuel pump, or even a catalytic converter that is wearing out. It’s also possible that you have a fuel sensor or emissions sensor (like the O2 sensors) that are damaged; which might be the cause of your check engine light). The best way to diagnose this issue is have a professional mobile mechanic complete a car is slow to accelerate inspection, so they can pinpoint why your Mitsubishi is having difficulty.

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. Slow Acceleration of Vehicle after start up

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: Loud jet engine noise when accelerating and when turning on AC

A few different things can cause this fault. Though 50,000 miles seems a bit early for most of them, the usual causes for the loud noise include: a failed idler, a faulty belt tensioner, an air leak, an exhaust leak,...

Q: Q: Squealing noise

Hello. It sounds like your drive belt may need adjusting. Drive belts that are too loose can squeal, especially when the engine is cold. I suggest you have a trained professional, such as one from YourMechanic, adjust your belt to...

Q: Car wont stay running with a new battery

Hi There, It sounds like you may have a faulty voltage regulator that may be over charging your battery. You may have a failing voltage regulator that could be allowing the alternator to supply too much or too little amperage...

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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...