Mass Airflow function on LLY
I'm trying to figure out exactly what the mass airflow sensor does for the Duramax motor, in this case it happens to be an LLY. I am getting black smoke under load and also have a reoccurring MAF code P0101. The data on the scan tool for the MAF looks fairly normal to me, though I don't have a lot of experience with watching the data stream on this vehicle (even though I own one of my own, and LB7 without EGR).
Is a faulty reading from the MAF likely to cause smoke? I have tried cleaning the hot wire unit with electronic cleaner, a trick that often works on gasoline motor hot-wire sensors and has worked on my own truck when I over-oiled the air filter. No luck on this one, though, and it as a stock factory AC Delco filter.
Owner, Phil's Auto Clinic, Hemet, CA, 1997 Napa/ASE tech of the year
2001 D/A Crew cab long bed, Edge Juice w/Attitude Monitor, Banks Exhaust, S&B intake, BD exhaust manifold, 152k miles, 2nd set of injectors 06/25/07
2000 Powerstroke Ford Club cab short bed, Edge Juice w/Attitude Monitor, 5" exhaust, S&B intake