When testing an EGR system for proper operation using a vacuum ...

[theo]

Question 1

What causes the nitrogen and oxygen in the air to combine and form NOx?
◦ Sunlight
◦ Any spark will cause this to occur
◦ Heat above 2,500 F (1,370 C)
◦ Chemical reaction in the catalytic converter

Question 2

When testing an EGR system for proper operation using a vacuum gauge, how much should intake manifold vacuum drop when the EGR valve is commanded open by a scan tool?
◦ 6-8 in. Hg.
◦ 1-2 in. Hg.
◦ 6-8 PSI
◦ 14.7 PSI

[ASDFGJLO]

Answer 1

Heat above 2,500 F (1,370 C)

Answer 2

6-8 in. Hg.

[theo]

Excellent

[T4T]

Thanks for the timely response, appreciate it