Q: Car randomly shut off while driving

asked by on

Okay so I was driving home about a week ago and out of nowhere my car suddenly shuts off on me so I got my buddy computer and read the code and the code was a p0340 which indicated that the cam shaft sensor bank one was no good so I went and replaced it with a new one and the check engine light went off the code no longer appears but now it won't start I replaced the spark plugs cause they were no good i replaced the spark plug wires, and the ignition module, it is getting gas cause when you push the valve on the vacuum line gas comes out I know that my battery is dead from trying to start it but even when I get a jump it still won't start it cranks over and sounds like it really wants to start but it just won't fully start I already did a trouble shoot on it and all the fuses and relays are working can someone please help me
My car has an automatic transmission.

Hi There, It sounds like you may have a failed fuel pump regulator. Fuel coming out of a vacuum line indicates that the diaphram inside the fuel pressure regulator may have failed causing fuel to get into the vacuum lines. As you know, when you turn the key to on, the fuel pump is activated and the fuel system is primed with fuel at a specific pressure in order to supply the fuel injectors with enough fuel to start the motor. When this is less than what is needed in order for the motor to fire or in some cases higher than normal, you may notice an erratic fluctuation in engine RPMs, hard starting or a lack of power when accelerating as the engine may be starved for fuel if insufficient fuel pressure exists in the fuel system. This can happen when the pump itself is not working properly or when the fuel pressure regulator is not maintaining the proper fuel pressure in the fuel system causing the engine to starve for fuel. I would recommend having an expert from YourMechanic come to your location to diagnose your fuel system.

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 randomly shut off while driving

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: Engine surges when stopped in traffic, high RPMs

Hi there. I do not have any information on this problem of the engine accelerating on its own. If the dealer has not duplicated the issue, then leave it for and extended test drive or duplicate it for them with...

Q: Rear tires on passenger side locked up

I would not drive the vehicle until it is looked at, as it is possible for the fault to cause an unsafe driving condition. When a brake locks up without any reason, it is most likely caused by a failure...

Q: Car needs new battery or alternator.

A technician, such as one from YourMechanic can come out a test the battery and determine if the alternator is running correctly. They can perform a load test on the battery and test all your fuses and pull codes on...

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...
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.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.