Skip the auto shop - Our mechanics make house calls

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: A faulty air mass meter could cause drivabi...

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 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: is my engine a free flow intermediate engine

Your engine is an interference motor that may bend the valves if your timing belt breaks. If you are having a problematic belt, a technician from YourMechanic can come to your car's location to replace your timing belt.

Q: Hearing noise form tires when turning

This is an issue that comes up often on this vehicle. Most of the time it comes up if the vehicle is 4-Wheel Drive. If it is then the problem is typically caused by worn out CV axles. If the...

Q: Heater only blowing cold air

This can be caused by a number of things. I'll start by checking the coolant level in the engine. If the coolant level is low, then this will occur as the coolant will not go into the heater core. If...

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...
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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...