Q: When I unplugged the TPC it runs like a new truck

asked by on

Its back. Fireing transmission is messin up

My car has 20000 miles.
My car has an automatic transmission.

Hi there. If when you remove the TPS (throttle position sensor) and the engine runs better, then there could be an issue with the MAP (manifold absolute pressure) sensor. Check the MAP sensor and see if the harness is good and free of corrosion. If the MAP sensor is working correctly, then the TPS has lost signal to the input and needs replaced. As far as the engine back firing, that could be caused by a camshaft sensor failing or a burned valve. Check the camshaft sensor for if it is plugged in all the way and test the sensor with the engine off. Manually crank the engine over as you check the sensor to see if the sensor is reading a resistance. If the sensor is not reading a resistance or it has resistance on it all the time, then the camshaft sensor needs replaced. If the sensor is working correctly, then check compression on the engine to see if there is a burned valve. The compression should be 120 psi or higher on all GM engines. If you need further assistance troubleshooting your vehicle, then seek out a technician, such as one from Your Mechanic, that can assist you with the engine running rough situation.

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. When I unplugged the TPC it runs like a new truck

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: Q: Timing off in vehicle.

Greetings! Have a trained technician, like the ones here at YourMechanic, come out and take a look for you. The mechanic will be able to turn the engine over to determine why the car is not starting and confirm proper...

Q: Water pump leaking at the gasket. Can I just replace the gasket?

If the water pump is more than 5 years old or has more than 60,000 miles, replacing the pump while you are addressing the leaky gasket will be less risky, more efficient, and cost-effective. Water pump bearings and seals do...

Q: Will a ford escape 2002 transmission fit into a ford explorer 2002? (Not 4x4)

No, they are completely different. An Escape is a front wheel drive platform, an Explorer is a rear wheel drive platform. There are two options for a front wheel drive Escape. If your production date is before 11/18/01, and 11/19/01...

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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.