2019 Buick Encore. P1101 and P0171.

Long term and short terms maxed out at idle. Increase to 2500 rpm no change.Maf sensor reads 0 KOEO. This engine is the 1.4 litre turbo. I am thinking this may be a valve cover issue with the PCV valve diaphragm ruptured. I believe this issue is notorious with these engines. O2 sensors are responding. Any thoughts?
 

Do you know what the 10th digit of the VIN? Because there's two different 1.4L turbo engines for your Encore. The older LUV engine is VIN B, the newer LE2 is M. Completely different engines, so it matters.

I'm thinking vacuum leak or problem with idle air control ??? Hi 👋

@Tyler VIN number is:
KL4CJESB2KB725820.

Good old LUV.  ​​​​​​

If you want to do some scan tool diagnostics first, look at the throttle opening % and MAF g/s at hot idle. If you're dealing with a vacuum leak (torn PCV diaphragm, broken non-return valve), the throttle opening will be nearly zero and the MAF will be significantly less than 1.4 g/s.

If you want to go straight for the common fail, just check the PCV diaphragm port in the valve cover for vacuum. If you find vacuum, follow this PI to check the non-return valve:

 

@Tyler-pulled PCV valve off intake- check valve in there missing. Drawing vacuum at valve cover. It is looking like he needs a intake manifold and a valve cover for this. My research reveals common problem with this engine.Thanks for the quick response.

@tyler- he is trying to have dealership repair this issue, but they are telling him the problem was permanently resolved after the 2018 Buick encore model year.

bills4065 wrote:

@tyler- he is trying to have dealership repair this issue, but they are telling him the problem was permanently resolved after the 2018 Buick encore model year.

Are they referring to a TSB or recall? Or warranty coverage?

If you really do have a LUV engine and the non-return valve in the intake is broken like you noted, then I can't see how there's any question about the problem...

@Tyler the dealership is talking warranty coverage.They may cut a bit of a deal for him. I will keep you all posted when I know. I recommended not Drive it like that for very long.

bills4065 wrote:

@Tyler the dealership is talking warranty coverage.They may cut a bit of a deal for him. I will keep you all posted when I know. I recommended not Drive it like that for very long.

Sound advice.

Have you or the vehicle owner considered during the work on your own? Aside from getting the vacuum hose off the boost solenoid, it's a pretty straightforward job.

@Tyler- will see how he wants to proceed and keep the forum updated when I know.

@tyler owner has decided to go with CruzeKits .com fix for this Will post results when have kit installed.Still waiting for the kit.

Well we installed the cruze kits repair on this, but still slight vacuum leak at idle, approximately 18% at idle. W will recheck all connections and update when fixed. We were at 70% fuel trim at idle before kit installation.