Skip the auto shop - Our mechanics make house calls

Q: Is it a fuel pump issue?

asked by on

My truck will stall when the rpm goes below 700. No check engine light comes on. Temperature is fine. Oil and gas are fine. I cannot strt the engine again without doing this method: press down on the gas pedal, take foot off gas pedal, and then press down halfway on gas pedal while turning key. I don't hear any strange sounds. No smells.

My car has 169000 miles.
My car has an automatic transmission.

A: It's possible that a failing fuel pump,...

It's possible that a failing fuel pump, or a clogged fuel filter or fuel injectors for that matter, can cause stalling at idle but there are other common causes such as vacuum leaks, EGR system faults, sensor faults such as the mass airflow sensor, as well as problems with the throttle position sensor and idle air control valve. Although the check engine light is not on, a Mechanic would still look for stored or "pending" codes to aid the diagnosis. A certified professional from YourMechanic would simply test each of these systems methodically, in turn, until the fault is found. It should be pretty easy in your case because you are not describing an intermittent problem, that is the fault is always there below 700 RPM and thus one of these systems is going to report "out of range" once tested per FSM (Factory Service Manual) specifications.

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: Slight tapping after overheating.

The freeze plugs were designed to pop out if your coolant froze to prevent damage to the motor. They do not come out from overheating. The leaking water from the freeze plug means that it rusted out from the inside....

Q: second gen motor swap

I would recommend keeping all motor components with the same motor (i.e. ECU, wiring harness, etc.) when doing this kind of a swap to eliminate any potential problems. Although there may be some components that are interchangable, you will save...

Q: If a code saying that my fuel sensor switch is not working properly goes unfixed, can it cause other issues later on?

Hi. The fuel pressure sensor's purpose is to relieve pressure in the fuel tank and the emissions system when it is needed to help control the pollutants the car puts out. The fuel pressure sensor being bad shouldn't affect the...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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.