Skip the auto shop - Our mechanics make house calls

Q: Is my transmission going in my car?

asked by on

Everytime i start my car it revs itself up to 4rpm and holds for a moment then drops down to 1- 1 1\2. As soon as i put my car in drive it will either "chug" and not allow me to accelerate or as soon as i press on the gas my car will go and basically drive itself(same in reverse only with othe the chugging). When i do drive my car bounces between 1 1/2 and 2 rpms. There are also points were my breaks are great or almost dont work. I have just replaced the o2 and speed sensors and the thermostat almong with unplugging the battery.

My car has 170000 miles.
My car has an automatic transmission.

You need to have the computer tested for codes and the engine checked for a vacuum leak to the brake booster. This would account for the high idle and lack of brake power assist. The most likely cause is that the brake booster hose came out when you were working on the engine to replace the O2 sensor. A certified mechanic could help you diagnose your acceleration issue and the other symptoms you are describing to find the right fix.

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

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: Accelerator not as responsive at times.

Hello. This may be a sign of a failing throttle position sensor. The throttle position sensor (TPS) is a sensor used to monitor the throttle position of the throttle plate inside the throttle body in relation to your foot position...

Q: Starting vehicle after a few hours of being parked.

Hi, thanks for writing in. This sounds like it could be a battery or alternator. I would start with testing your battery with a multi meter. Good batteries hold a charge of 12.6 volts or higher. If the battery is...

Q: Wipers working intermittently.

Although the most common problem for the wipers on this vehicle is the wiper motor, I'm not quite certain this is the case for you. I believe you may have a bad ground somewhere under the dash. I would have...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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.