Skip the auto shop - Our mechanics make house calls

Q: Car stutters and occasionally dies. Tripping po171 code running lean.

asked by on

Does the GM 2.2 ecotec have an MAF sensor? If not what should i look at to see why car is getting code po171 running lean?

My car has 155000 miles.
My car has an automatic transmission.

Your engine does have a MAF sensor, follow the tube that comes from the air filter housing to the throttle body. You should see a connector with 5 wires and that should be the MAF sensor.

The most common cause for the P0171 code is a vacuum leak. Check the tube from the air filter to the throttle body carefully for any crack that would let air in. If any air gets in through that tube it will not be measured by the MAF sensor and will throw up the P0171 code.

Also check the vacuum lines that attach to the intake manifold. If any are disconnected or broken they will need to be repaired as they will cause the same problem as a tear in the air duct. It is also possible that the intake manifold gaskets are leaking. They are just rubber o-rings. Over time they get brittle and will not seal anymore and will need to be replaced.

If none of these problems solve your issue you could be looking at a bad MAF sensor or a oxygen sensor that is failing. If you need more assistance with this, I would set up an appointment with one of the mechanics at YourMechanic. They can come to your home or office and diagnose and repair 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!
  • Home
  • Questions
  • Car stutters and occasionally dies. Tripping po171 code running lean.

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: Windshield wiper assembly question.

Hi there: If you got the replacement parts from an auto parts store, you might want to verify that the replacement parts were for the right model and year of Pontiac Sunfire (as this is a common problem with auto...

Q: Do plugs need to be removed to get to the tube seals

Hi there. It is much easier to replace the tubes after removing the spark plugs. However, installing new tubes is a unique step and requires additional time to complete the task correctly. This is why most mechanics bill for the...

Q: probkems with automatic climate control

Hello there, there are a few common faults that can cause the AC to malfunction like this. The most common cause of this fault is a failed outside temperature sensor, wiring issue, or a failed temperature control module. Due to...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.