Skip the auto shop - Our mechanics make house calls

Q: Engine runs, but car doesn't accelerate?

asked by on

Engine runs, but when I push the gas pedal, the car doesn't get accelerated. It runs like it is in D but without pushing the pedal. The wheels doesn't have power. But the RPM goes high. If i push the gas pedal in neutral, the sound of the engine is not as high as normal. Before, when I push the pedal, it used to make a noise, and RPM would go around 6-7, but now only goes around 3-4. This issue happened first time when I stopped in the block, and accelerated so hard, and while acceleration it stopped running. I barely pulled over the car, stopped the engine, waited like 10 minutes, then it started working again and I got home safe. I took it to mechanic, and mechanic did some kind of computer diagnostics and told me that it some kind of sensor which does something when I press the gas ped. Replaced for $400. After replacing that sensor, car run OK for about 5-6 hours. Now it doesn't. Broken again. Engine light is on. I wanted to talk to you guys before I go to THAT mechanic again.

Knowing the results of the computer diagnosis as well as the part that was replaced can be helpful in assisting you with your Pontiac G3. It is possible the part that was replaced is defective and may need to be replaced. Based on what you described with your vehicle, it appears that you may be experiencing transmission issues.

The engine should never be revved up to six to seven thousand RPMs when the vehicle is not moving, as this can cause damage to the vehicle’s components. Because the information provided is a little unclear, it is hard to determine if you are having concerns with your transmission or if the problem lies with the engine itself.

If you don’t trust going back to the same mechanic that worked on your car originally, get yourself a second opinion and enlist the help of one of our certified mechanics who can diagnose why the Check Engine Light is on as well as determine why your Pontiac is not accelerating. They will also be able to assist you with the repairs needed to get your G3 up and running again.

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

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!

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: no start

There are several possible reasons for a vehicle to crank and not start. A bad fuel pump, clogged fuel filter, faulty injectors, bad ecu, failed ignition coil, or a malfunctioning sensor. It will first be necessary to figure out if...

Q: Hear knocking at bottom of engine

Unfortunately, there can be several different reasons that could duplicate the sound of a knock in the engine. With the information provided being limited, it is difficult to determine what the cause of the knock is. In a best case...

Q: Antifreeze leak in a 2000 Pontiac Grand Am

Hi! Commonly, a coolant leak on your particular vehicle will be from a thermostat, bad hose connection, or a cracked radiator. I suggest pressure testing the cooling system to help highlight the area that may be leaking. The illuminated Check...

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...
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.
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.