Skip the auto shop - Our mechanics make house calls

Q: I have to tap the gas pedal to get my car started.

asked by on

My car will not start unless I tap the gas pedal while turning the ignition key. I replaced the throttle body, thinking that was the issue, but it did not fix the problem.

This could possibly be an issue with your Manifold Absolute Pressure sensor or MAP sensor. This sensor monitors the pressure inside the engines intake manifold. This pressure changes when the throttle is depressed. Perhaps the sensor is only reading a correct pressure to start the engine when the throttle is fully depressed. I would recommend having a professional check your car for trouble codes with an OBD2 scanner. Once trouble codes are found the problem will be easier to diagnose.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: When I try to start my truck, the lights work but no crank.

First, we need to make sure the signal wire to the starter is properly connected and the power cables are attached properly. I have seen many situations where the signal wire is loose or the connector is broken and the...

Q: P1456 - Check engine minor EVAP Leak.. Not the Gas cap

If you smell gas, there can be a leak in a number of places. All the fuel lines should be carefully inspected to make sure they are secure and undamaged, all the way up to the fuel injectors themselves. Even...

Q: bold on top of tire broke, dislogging the tire but I could not even start the engine.. what is that?

Hi there. I'm not quite clear as to which bolt on the tire you're talking about. If it was a lug nut that broke while removing a tire, it would have no impact on the engine starting. However, if a...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...