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: If you just put a brand new tps in a 97 jeep grand cherokee and the idle is at 1000 rpms, would you consider that the sensor is bad? Thanks

Hi there. You can adjust the throttle plate on the throttle body or adjust the throttle position sensor. If making the adjustments has no effect on the engine idle, then there could be a vacuum leak or the Idle Air...

Q: Low grinding noise in low gears like turning corners

Hi Kyle, It sounds like you may have a failing or worn out wheel bearing. A wheel bearing will usually fail due to pitting or small damage on the surface of the rollers or the bearing race. Both the surface...

Q: P0170 and P0173 codes. Mercedes-Benz w203 V6 C230 2006 year sport-sedan

You're right to check for vacuum leaks. Low fuel pressure could also be a problem. P0170 and 173 refer to fuel trim on bank one and bank two. The ECU has detected that the engine is running lean, and is...

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...