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?
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 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: Car drifts when driving.

Hi, it sounds like you may have something worn out in the front end. It could be a ball joint control arm, or tie-rod end. If it was the steering box (rack and pinion) you may have a lot of...

Q: Q: Starting issue, fuel smell

The fuel pressure would need to be checked to make sure the pressure regulator is not leaking fuel and that the pressure is correct. You may have a leaking injector if the pressure is okay. I recommend having a certified...

Q: Cars stalls when the AC is turned on.

A seized AC compressor can stall your engine when you turn on the air or defroster because it sends a signal to engage the clutch on the compressor, which causes more resistance than normal. But there are switches that level...

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...
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.