The check valve in the intake that just falls out and get's ingested is part of the PCV system. Should that be covered by the emission warranty ? It is a part of the emission system. What do they consider major components ?
Emission Control System Limited Warranty
For light duty trucks, see “How to Determine the Applicable Emissions Control Systems Warranty” under Emission Control System Warranty on pg. 21 for more information. Defects and performance for car and light-duty truck emission control systems are covered for the first 2 years or 24,000 miles, whichever comes first. From the first 2 years or 24,000 miles to 3 years or 36,000 miles defects in material or workmanship continue to be covered under the New Vehicle Limited Bumper-to-Bumper Warranty coverage. Specified major components are covered for the first 8 years or 80,000 miles, whichever comes first. Defects and performance for heavy duty truck emission control systems including those found in 6.6L Duramax[SUP]®[/SUP] Diesel Engines are covered for the first 5 years or 50,000 miles, whichever comes first.