Q: Car jolts while accelerating and won't accelerate from stop.

asked by on

I've been having this problem for a few weeks. My car will jolt on acceleration, and lately when I try to move from a stoplight or after braking, the car doesn't move forward after I release the brake and I have to step on the accelerator really hard to get the car to move. I thought it might be a problem with the fuel injectors, because when the problem first came about I used some fuel injector cleaner and the problem improved and almost went away. Adding some fuel injector cleaner helps slightly now, but not always. My mechanic said it just smelled like old gas, that I should use plus gas for a week or two, and he tuned up my car. My car felt much better for about two days, but now it's back to the hesitation again.

My car has 90000 miles.
My car has an automatic transmission.

Hello. From what you are explaining it sounds like you either have a failing fuel pump or a bad catalytic converter. Both of these issues will cause these symptoms.

I usually start by scanning the computer for codes first to see if there is any indication of a bad sensor. If those are fine then I check the fuel pressure. If the pressure is below specs then the pump needs to be replaced. If it is fine then the converter back pressure needs to be checked to see if it is failing as it will clog the exhaust and keep the engine from building power.

If you plan on having this repaired, consider receiving assistance from a certified mechanic who can come to your home or office to diagnose this lack of power and get your car running normally again.

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 jolts while accelerating and won't accelerate from stop.

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 lost reverse. What could that be?

Hi there. The noise of grinding sounds like a gear that is broken or damaged like a pinion gear in the differential or a drive gear in the transmission. Get a stethoscope for an automotive vehicle and put the probe...

Q: Q: How do I fast forward and rewind an iPod?

While listening to your iPod through the sound system, you can fast forward and rewind through songs. To fast forward through a track, press and hold the Seek button for more than 0.8 seconds. To rewind through a track, press...

Q: Q: My speedometer stopped working

Hello. The Toyota Yaris has an ABS system that has small sensors in each wheel. When the ABS system has any of these sensors that are not working, this will also cause the speedometer to not work as well. I...

Related articles

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...
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.