Q: Car only starts when I pump the gas pedal.

asked by on

I replaced the throttle body and now the car will only start when I pump the gas pedal. What do I need to have fixed?

From this description it seems that there could be separate issues happening to your Mitsubishi Eclipse. The three most common reasons I see for a car unable to start without pushing the gas pedal include; the throttle body gasket may have been installed incorrectly, the idle speed control screw needs to be adjusted and finally the throttle position sensor may need to be adjusted.

Every car may be made up of the same parts but they all install and work slightly differently. Sometimes parts aren’t ready to install right out of the box so it is necessary to make certain vital adjustments to the part, in order to have the throttle body do its job properly. If this is the case, a trained professional can easily diagnose this concern on your car and determine if this is indeed the problem and will be able to make the adjustments necessary. While they are doing this, they can also inspect the idle speed control screw. The engine will need to be running, allowing the screw to be adjusted to run at the specified RPMs for that vehicle. Finally, with the throttle position sensor, a certified mechanic can adjust it by using the manufacture specs, it needs to be installed and clocked (turned a specific way) then a voltage meter is used to check the signal voltage (signal voltage is 5v and as you step on the gas pedal the voltage will vary from 1.5 up to 4.5 volts to tell the computer where the position of the throttle is and use his information along with other sensors to determine how much air and fuel are put in the engine) to ensure that the voltage specs are in the proper range.

As you can see, it is important to have a certified mechanic to look over this problem so they can diagnose which part may be failing and get you back on the road safely.

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. Car only starts when I pump the gas pedal.

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: Key turns, no crank

The starting system is rather simple. There are only a few components that can cause this to happen. The first place to check is with the starter. They can fail intermittently and this is a sign that it is going...

Q: I own a 2014 Chevrolet Captiva about 8 to 10 times a day the key will not come out of the ignition I have had the shifter linkage

The entire shift mechanism should be looked at. The shifter mechanism may be worn or bent if "adjustment" helped temporarily. Also the ignition switch may not be signaling the shifter inter-lock mechanism. Also, if the inter-lock mechanism is loose, out...

Q: Q: Car overheating and not starting.

If the engine has been overheating and got hot enough then you may have caused some serious engine damage causing the engine to no longer start. If it did not get too hot then these may be separate issues. When...

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...
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...