Q: Car stalling at average speeds, no engine codes

asked by on

My SUV has stalling issues. It loses power. It occurred one time when I was going downhill at about 50 mph. The other time I was going uphill. I replaced the throttle position sensor and checked the spark plugs. Everything seems fine and there are no engine codes. Any ideas what can cause this?

A faulty air mass meter could cause drivability issues and not throw a code right away. The air mass meter is one of the sensors that help sets base injection timing. If the sensor is reading correctly but is within the parameters of the the engine control unit, it may not set a code, and then can lean out the engine on slow down from a steady cruise and starve the engine of fuel by cutting injection timing back too much.

Looking at the oxygen sensor voltage while slowing down from a steady cruise could indicate what the oxygen sensor is seeing while decelerating. You may want to enlist the help of a mechanic, such as one from YourMechanic, who will have the diagnostic equipment and expertise to track down the source of your stalling issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Car stalling at average speeds, no engine codes

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 rebuild or used low mileage engine...? 2004 Ford F150

Hi there - replacing a worn out engine offers several choices: rebuild, replace with a used, lower mileage engine, or install a new or often-called "crate" engine from Ford. In terms of convenience and reliability, a "crate" engine can be...

Q: Check engine light came on, stayed on for a month, then went off.

Hi there. In most cases, the P0420 code means that either the upstream or downstream oxygen sensor in the catalytic converter is not working. The other code listed tends to be caused by issues with the catalytic converter being damaged....

Q: Engine cut out at around 75% throttle.

Hello. If you continue to get code P0135 even after you have replaced the sensor then you have a problem in the harness or problem in the ECM circuit. Check and follow the O2 sensor harness for the passenger side...

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...
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...
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.