MAF wiring diagram needed?

Hello,

To my knowledge I have not seen a MAF issue cause random or multiple misfire codes.
Codes like this are usually caused by bad ignition coils, spark plugs, bad injectors, compression and possible intake air leaks. Bad wiring/connectors can also cause misfires.

When unplugging the MAF sensor the engine control module will replace the missing air mass signal with a factory pre-set replacement value.

Below are some diagnostic guides:

https://www.2carpros.com/articles/automotive-engine-misfire-code-p0300-causes-and-solutions
and
https://www.2carpros.com/articles/symptoms-of-engine-misfires-a-step-by-step-guide

A video:
https://youtu.be/e3YCZa2Ygpo?si=cIckU3jHiGY6xjJT

MAF sensor:
https://www.2carpros.com/articles/how-a-mass-air-flow-sensor-works-maf

Cheers, Boris

When i open the oil cap it just blows air and oil back at me and smokes a lot. So, i believe there is either a stuck ring or worn valve stim or a seal somewhere. So i believe this engine is just done.

Hello,

It sounds like your 2.4 Ecotec engine is suffering from the well-known clogged PCV system issue. The PCV, Positive Crankcase case Ventilation, system is prone to clogging and can cause high crankcase pressures.

It is a 2-part system, pipe to the left of the air intake to the valve cover and the main ventilation valve in the intake manifold.
To clean the intake PCV valve ideally remove the intake manifold, but it can be cleaned in situ too. See image 1
The other part, pipe to valve cover, is easily accessed by disconnecting from air intake and valve cover. Ideally remove valve cover to clean. See image 2.

A few videos:
https://youtu.be/a5gL_OMtFVc?si=bs2lCCnA_a_Xqlen
and
https://youtu.be/1uGTEWWrlSs
and
https://youtu.be/cyoJ02cAQig?si=g305lI4D_8t7FxjR
and
https://youtu.be/eRW5PCgwyhk?si=F7yyUa6cUTe-u0nJ

GM service bulletin:
https://static.nhtsa.gov/odi/tsbs/2015/SB-10057696-3071.pdf

Cheers, Boris