Skip the auto shop - Our mechanics make house calls

Q: Vehicle hard to start, but runs well once started.

asked by on

Vehicle hard to start, but once it is started it runs well. It also idles well with no misfires.

A: Hi there, The problem you are having is mos...

Hi there, The problem you are having is most likely due to the fuel pressure not holding it's static pressure to the injectors. The fuel system needs to hold fuel pressure to the injectors in order for the injector to spray fuel into the engine as soon as you start cranking your engine. If the fuel pressure drops after you shut off your vehicle then the next time you crank your engine the injector will open, but there is no fuel there to inject into the engine and it will take about five seconds of cranking to get the fuel pressure built up enough to start injecting fuel to start the engine. YourMechanic would perform an inspection, they would test the fuel pressure and isolate the problem as being either the fuel pump check valve, regulator or a leaking injector. If it is an injector then you would have a rough running engine until the excess fuel gets burned off. Once tested and the failed component is isolated, then the repair can be done.

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: Vehicle dies when I give it gas.

The vehicle may have more than one problem causing this problem. These problems were from things like the coolant sensor giving false readings, engine control modules failing, throttle position sensors failing and the mass air flow sensors failing. All of...

Q: Spark plug stuck right in the head, how bad is it?

The spark plugs in your engine have an extended shield on the tip of each plug. This shield will get a carbon ring build-up over time and if you try to remove the plug, the carbon will bind the treads...

Q: What do the controls do on the dual automatic temperature control system?

If your car is equipped with a dual automatic temperature control system, it allows you to set a different temperature for the driver side and passenger side. Once you’ve set the temperature, the system will automatically maintain it until you...

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 Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...