[Blasirl]

Welcome Aboard!

There are many things that can cause the P0171 trouble code on the Chevy Cruze. Here are the most common ones.

• Vacuum Leaks– With the Chevy Cruze, one of the most common cause for the P0171 code to show is a vacuum leak. Take a look around and see if you can find the vacuum leak. Here’s a great YouTube video on how to find a vacuum leak.
• Oxygen Sensor– The P0171 codes is thrown when the oxygen sensor(s) do not register enough oxygen in the exhaust. When the oxygen sensor is bad, it can cause a false reading and trigger the code. The computer will still adjust the air/fuel mixture to compensate. This will cause the Cruze to run rich. O2 sensors are relatively affordable.
• Mass Air Flow Sensor– The mass air flow sensor calculates the volume of air entering the engine. If it has gone bad, the air fuel mixture will be off and the P0171 code will show.
• Bad Fuel Injectors– If you have one or more fuel injectors that have gone bad that can certainly cause the air/fuel mixture to go bad.
• Fuel Pump/Fuel Filter– Today’s modern fuel injected motors need a lot of fuel pressure to atomize the gas properly. If the fuel pressure is not as high as it needs to be this atomization doesn’t happen properly and the optimal air/fuel mixture isn’t achieved.
• Air Filter– While it’s not the most common reason to throw the P0171 code, a clogged air filter certainly can cause the code to throw. And, since it’s so easy to check, why not look?

For more info see https://www.700r4transmissionhq.com/p0171-chevy-cruze/


Don't forget to introduce yourself and your Cruze here.

 

[Blasirl]

https://static.nhtsa.gov/odi/tsbs/2015/SB-10059023-1322.pdf

 

[Blasirl]

Plugs said pregaped dont regape them so i didnt even look at it. I will check tha. fuel pressure 56-57psi according to obd. Not sure what spec is on this car. I ran seafoam in last tank but ill get some chevron today and try it again, maybe not using it for a long time and then running a treatment clogged injectors with crap?? This is driving me nuts lol

Check them. .028, 18 ft-lbs, no anti-seize, insure no rips/tears or holes in them, light coat of dielectric grease inside and out of boots. If you regap them, do not pry on the electrode as it will probably break.

As soon as you decide which engine and which Gen you have, I will move this to the appropriate forum.

 

[Blasirl]

You have a Gen I LS. Post your VIN and someone can decode it for you.

 

[Blasirl]

Water Pump??

I would have said check the fuel filter although I think that is part of the fuel pump.