Skip the auto shop - Our mechanics make house calls

Q: Throttle position sensor reads 13% at idle and 75% fully open.

asked by on

I have a throttle position sensor that's reading 13% at idle and 75% of the wide open throttle. I've replaced the sensor with no luck. Should I try to move the throttle stop screw? If so, the screw looks like it's not that easy to move with a screwdriver. It's inserted in the throttle body and smooth. Any ideas?

A: No, you can't start messing with those ...

No, you can't start messing with those because there are all kinds of sensors. If you set that up in the throttle position sensor, it's going to get wrong reading, and may get the wrong amount of air and confuse the computer.

It would probably send trouble codes and stuff. Basically, I would recommend having a mechanic analyze the data live. They can hook up the scan tool and look at live mode 6 data to see if there is anything else that's having a problem.

Maybe the fuel injectors are not pulsing right. There are all kinds of things that can go wrong. Wiring could be having a problem on it.

But you just don't want to mess with those screws. In the past, I attempted to do that as experiments on cars that were really junky and falling apart, and it never worked out right. Either, the Check Engine Light came on or they just wouldn't run right. You've got to find out what the problem is and not start bypassing that stuff like that, because if you do, it gets even more complex trying to figure out what's wrong.

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・Save up to 30%

Get a quote

What others are asking

Q: There is a jerking that seems to be coming from the throttle sensor

Without more detail of the symptoms, there are several possibilities that could cause this. As you may know, there are a few different sensors related to the fuel delivery in your car's intake system - one of which is the...

Q: The car with the sensor reference, low circuit and ceased voltage doesn't start

The first thing you want to do is have a certified mechanic unplug the main computer and test the wires coming out of it. Either the wiring is bad, or the computer's connectors have a little condensation and corrosion, which...

Q: My car idles rough when stopped

This may be a sign of a leaky injector or potentially an incorrect idle air adjustment. A leaky injector can cause a rich fuel condition as it may leak too much fuel into a cylinder not allowing the combustion cycle...

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 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...
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...