5 things to check if your car will only start when the gas pedal is being pressed


Posted by: Jane Osuagwu

Share this post:

Latest news articles

Does your car only start when the gas pedal is being pressed? Check those 5s right away!

Are you having a hard time starting your car? Does your car only start when you give it gas? This can be annoying, especially when you are running late to work or an appointment. Well, Naijauto.com is here to help you know the reason for your car only starting when you pump the gas.

A car parking near a field

Sometimes you car just refuses to start in a normal way, leaving us nuisance

5 things to check if your car will only start when the gas pedal is being pressed

The reason for your car having a hard time to start is not like other hard starting car problems which can be traced to the car battery. This problem shows that the air-fuel mixture is not igniting the engine or the engine is not getting a sufficient amount of fuel and air for combustion. Also, not forgetting other car components which can cause the problem. Let’s check the causes following the steps below.

Foot on the gs pedal

Follow these steps down below to find out the issue

1. Inspect the air filter

To allow adequate air to flow into the cylinder, it’s advisable to inspect the air flow filter. It’s the major reason for the shortage of airflow. A clogged air filter brings along many problems including ceasing the air from reaching into the combustion cylinder, hence an air filter replacement is needed.

And if the filter is already clean, the next check should be for a crack or leaky induction system. There could be a leak that is letting in the excess air into the system. To identify the leak or cracked area, spray a starting fluid close to the area you suspect. If the engine's tune changes, it’s a clear sign of a leakage.

Clogged up air filter

If dirt gets to fill up the air filter, it will cease the air from reaching into the combustion cylinder

2. Assess the fuel filter

Here, the fuel filter can be visually tested. Some filters have a window where you can look to see their interiors. If the filter has dirt inside it or it's dark, do replace it immediately. And for the fuel filter that doesn't have a window to check the interior, you can assess the outer area. If the filter has rust all over it, you should replace it.

fuel filter

 If the filter has dirt inside it or it's dark, do replace it immediately

3. Inspect the fuel pump

To inspect the fuel pump, you will need an amp clamp which will be placed on the positive pump-wire. The next step is to start the car, then get a voltmeter which will be used for recording the amperage reading. Now, compare the readings you recorded to the specification defined by the manufacturer.

Note: If the recorded amperage reading is high, it implies the fuel pump has been working hard. The solution here is to replace the fuel pump.

If your car won't start except you give it gas, then watch this video

4. Examine the compression

To check the compression, buy, rent or borrow a compression tester. The compression testers fitting should be inserted into the spark plug, then you turn the engine on. While the testing is going on, the fuel pump relay and ignition coil should be unplugged. Here, if you find out there is a difference of 40psi in the two adjacent cylinders, know that it's a serious problem. It is because a compression value should be above 100psi.

There is an alternative to a compression tester. Here, your finger should be placed over the spark plug's hole then have someone else start the engine. If your finger happens to take the pressure generated, know that your car's compression is insufficient.

Compression testing

The compression testers fitting should be inserted into the spark plug, then you turn the engine on

5. Test the throttle body

The alligator clips should be inserted inside the right jack on the DMM, with the range set to 20k ohm. The throttle body, now connected with three wires, the test lead should now be attached to the center wire and the other lead attached to the ground connector. Now, a full range movement should be made slowly with the throttle, from a closed to a full-open position. If there's a sudden increase or decrease of the DMM, know it's an indication of a bad throttle position sensor. And with these, you’ve known the reason your car only starts when you give it gas.

>>> Related posts: What to do when your car refuses to start?

>>> Discover useful driving tips and advice on Naijauto.com!

Jane Osuagwu
Jane Osuagwu

Jane Osuagwu

Car prices

Jane Osuagwu is an automotive writer at Naijauto.com. She's a car enthusiast who loves creating educative and informative topics on cars, ranging from maintenance tips to updates on the latest trend in the auto industry in concise and friendly writing. 

Jane is also a blogger and loves reading, inspiring people and getting involved in personal development projects.

See more