Skip the auto shop - Our mechanics make house calls

Q: Vehicle is difficult to start sometimes; Sounds like it's about to stall when at idle

asked by on

Hello,

Please help me diagnose this thing, Thanks for your help!

My car has 157000 miles.
My car has an automatic transmission.

A: In order to isolate the hard engine start t...

In order to isolate the hard engine start the first test will need to be a fuel pressure and leak down test to see if the pressure is within specifications when the key is turned on and the pressure stays up when the key is turned off. If the pressure drops to zero when the key is turned off then you have a leaking fuel pressure regulator or fuel pump. The fuel rail return line will need to be clocked off to isolate the fuel pump to see if it still leaks down. If it does leak down then the fuel pump internal check valve is bad and fuel pump needs replaced if the pressure now stays up and does not leak down then the fuel pressure regulator has a leaking pressure seat and needs to be replaced.

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

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 drive normally for 10km the car get stuck to third gear, no up gear or lower, The N blinks. Switching off makes it normal

Hello. If the transmission is sticking in gear then that is the first sign of transmission failure. I would like to know how the fluid looked. If it was very dirty then the transmission is failing. If not then it...

Q: My car has a coolant leak but the engine is not overheating.

Since you have had the water pump and intake gasket replaced in the last two years, I would recommend having the system pressure tested and inspected to see if the radiator is leaking or the water pump is leaking again....

Q: Hard startup immediately after fill up with gas. Then starts quickly each time until next fill up.

The most common cause of hard start after fill up is going to be the excessive gas fumes during refueling the vehicle will flood the engine causing the hard or no start. The excessive fumes will normally be stored in...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.