Q: Engine running rough and won't accelerate

asked by on

The car will start fine but won't move off with normal accelerator application. I have replaced the throttle position sensor and no change. If you put the pedal hard to the floor it will take off and seems to run ok once above 2500 - 3000RPM.The engine warning light is on and indicates P0031 and P0037.

I have replaced the O2 sensors either side of the catalytic convertor with no change. I have installed a new air line from the filter to the turbo charger body.

This vehicle is driving me nuts. Any ideas?

My car has 109000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. The camshaft and crankshaft position sensors are a possible cause of the symptoms you described. Having these sensors tested professionally using the manufacturer’s recommended procedure would by my best recommendation. If one of these two sensors fails the test, it is a good idea to go ahead and change them both due to the fact that they work together to send a signal to the vehicle’s PCM and they have likely been on the vehicle for the same amount of time. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

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. Engine running rough and won't accelerate

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: Q: Car overheating and not defrosting properly.

Hi, I have seen this issue quite often on the PT Cruiser. This is typically caused by a failure in the heater core that is located in the dash. This part carries hot coolant into the interior of the car...

Q: Driver's side seat is stuck and power switch is not working

The power seat has three motors to control the three different motions. The switch is a multiple position switch that will control the motor direction. Your vehicle most likely has a defective switch but it would need to be tested,...

Q: Q: Ac compressor

Hi there. It sounds like you may have one or two concerns here. Does the AC indicator light up when you turn it on? If so, this means that the command for AC is active. If the light flashes, this...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.