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, or ...

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

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: Wind noice on front doors

The part is not L shaped but is a square piece with two wings. The purpose of the part is to stop the air from flowing through the window channel. The large section pushes into the channel in the corner...

Q: Van freaking out

Hi there. When your car experiences serious electrical glitches like you've described above, it is commonly caused by an exposed wire creating a short circuit situation. It could also be caused by an internal issue with the ECU. Since an...

Q: Truck cranks but won't start.

Hi and thanks for contacting YourMechanic. The EFI supplies power to the C/OPN relay. Check the wiring from the EFI and the C/OPN relay for any breaks. Use a digital ohm meter and check for a complete circuit in the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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.