Q: How can I be sure i am having a Throttle Position Sensor issue?

asked by on

When I come to a stop and then pull out my ML320 does not respond to the throttle. Although it will begin to slowly move and pick up speed but it still does not respond to acceleration attempts. Finally, after numerous attempts, I shut the ignition off and more often than not the problem disappears and it resumes normally to giving it gas.

My car has 135000 miles.
My car has an automatic transmission.

Typically a throttle position sensor (TPS) is tested using a multimeter. The specs to compare against are published in the Factory Service Manual. As long as the TPS tests within the range of published values, and does not display intermittent or sticky operation, you can assume it is good. There are other components within the air induction system that should be considered such as any mass airflow sensor, idle air control valve and so forth. Faulty EGR systems, and fuel system deficiencies, can be a part contributor to the acceleration problem you are describing. In addition, the fault may not be component related but rather wiring or ground related. Of course, an attempt should be made to see if any Diagnostic Trouble Codes have been set in the PCM which codes might provide clues to the origin of the fault. If you desire that this problem be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a poor acceleration diagnostic and the responding mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic.

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. How can I be sure i am having a Throttle Position Sensor issue?

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: Problem with replacing the TPS

Your throttle position sensor says it is on the throttle body assembly. Look at the gas pedal position sensor, above the gas pedal, to see if this is the sensor the parts store gave you. This sensor is called the...

Q: My 2002 saturn vue loses speed going up hill what could it be

Hi Evanie. Thanks for contacting us tonight. Generally speaking, acceleration issues while climbing are typically caused by ignition system parts or fuel system components that are worn out or clogged with excessive carbon deposits. Essentially, the engine struggles to correctly...

Q: I press the gas pedal but the car isn't getting gas. The engine doesn't rev up.

Good question. I want to go through a few steps with you and hopefully find your problem and save you some time and money. If you find the issue during steps, then ahead and fix that fault and you should...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...