Skip the auto shop - Our mechanics make house calls

Q: Hard to start and idles roughly, though travels at normal speed once started.

asked by on

Car runs, though it is hard to start. It also idles roughly and I have to hold the accelerator to start. Once I get it started it travels at normal speed.

Hi there. There are a lot of possible causes of this. If the check engine light is on then the computer should be scanned to see what codes are coming up. Most of the time when you have symptoms like this on your vehicle it is because you either have a failing air flow meter or you have a fuel pressure regulator that is leaking into the engine. The regulator can be tested by pulling the vacuum line from it while the engine is running to see if fuel comes out. If it does then the regulator is bad. If it is fine then further testing must be done with the right diagnostic equipment. You should enlist a certified mechanic with these tools to do this, like one from YourMechanic.

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!
  • Home
  • Questions
  • Hard to start and idles roughly, though travels at normal speed once started.

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: Door lock problems.

You will need to have the vehicle checked by a mechanic like one from YourMechanic to see all that got damaged. You may have to have a door lock plate put on to mount the new lock to. If the...

Q: I am getting a P0171 code. It runs smooth and the fuel trim is good at idle. Under load the trim goes high.

If your fuel trims are ok at idle,but seem to climb when a load is applied to the engine the problem may be in the fuel delivery or air metering. A clogged fuel filter may disrupt the flow up fuel...

Q: car slows with acceleration

The hesitation may be a dirty throttle body or bad throttle position sensor (TPS). If it drives better with OD off, I suggest leaving it off or having it diagnosed and repaired. It won't hurt anything to leave it off...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...