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・Fair and transparent pricing

Get a quote

What others are asking

Q: Brown stuff coming from the radiator.

Hi there: If you have almost 600,000 miles on your Impala, it's probably time to replace your radiator, as the brown stuff is likely rust coming from within your radiator due to excessive use.

Q: Water pump housing leaks

Hello. This comes up often on this engine. If the housing for the water pump is leaking, then the water pump needs to be replaced. Most of the time the water pump housing does not leak on this engine, but...

Q: No start, new key

Hello. In most cases the plastic cover that goes over the ignition switch should not prevent the engine from starting, it sounds more like your vehicle is being immobilized by the anti theft system. You may be able to deactivate...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.