Engine power reduced, stabilitrak light comes one

Asked by GuruS78ZJ Jun 21, 2019 at 01:39 PM about the 2011 Chevrolet Impala LT FWD

Question type: Maintenance & Repair

My 2011 Chevy impala lt keeps having an
issue of engine power reduced, stabilitrak
comes on and it jerks as if the engine wants
to turn off. If had the gas pedal replaced and
throttle body and mass air flow sensor.
Yesterday I bought a new air intake hose
also. Worked fine until today 20 minutes ago
car was driving fine and out of nowhere this
pops up and my engine power is reduced to
under 20. Code p0171 popped up said could
be the mass air flow sensor but that’s brand
new. I don’t know what else it could be that it
is doing this. Randomly happens on the
highway or back roads. Help! I’m running out
of ideas on to what it is. I depend on my car
a lot for my regular daily job and my side job.
It’s the only car I have

3 Answers
20

DiagnosticianRus answered 5 years ago

P0171 means you’re engine is running lean. Could possibly be a vacuum leak. If you can read live data posts your 02 values and your fuel trim values. You can disconnect your MAF and see if that changes anything. It could be over or under reporting. New parts don’t mean they’re good. I would really look for a vacuum leak. Inspect all vacuum hoses for any holes and listen for hissing sounds. Possibly even a disconnected hose. If you do hear a hissing sound you can wave your hand over the vacuum hoses and you will hear a change in the way it sounds if your hand goes near it. Also, a water bottle with a small hole to spray it onto hoses is a good low-tech tested method. If you spray water directly where the leak is it should cause the engine to stumble.

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10

Megan answered 2 years ago

I'm having this same type of issue with my 2011 impala. Service stabilitrak, engine power low. Was supposedly fixed but after having my car back from mechanic a few months it started happening again. And now to a worse degree than before. If Anyone has any answers/information please help! Having my car running is my only way to have income atm.

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