EVAP Archives - UnderhoodService
Perform OE-Level Analysis With New Diagnostic Tool

Bluetooth-enabled device automatically identifies make, model and year match software.

EVAP Test Late-Model Vehicles with Redline Detection EasyConnect

Technicians can snap the adapters into an easily accessible line, then connect their smoke machine to the EVAP system.

VIDEO: EVAP Water Leak TSB For Nissan Sentra

Andrew Markel discusses a TSB from Nissan regarding a water leak in the EVAP system, and how moving the position of the box drain should remedy the issue. Sponsored by Nissan.

nissan-tsb-evap-box-drain-water-leak-video-featured
VIDEO: Solving An EVAP Leak Issue With A TSB

Andrew Markel discusses common EVAP system codes and how a TSB can help quickly solve this diagnostic dilemma. Sponsored by Nissan.

nissan-evap-code-tsb-video-featured
Top EVAP Tips When Replacing Fuel Pumps

Nothing is worse that an EVAP code after a fuel pump has been replaced. Discovering that the tank needs to be dropped again to address a problem can kill shop productivity and profitability. Keep reading for tips that can help you avoid comebacks and dropping the tank for a second time.

Finding The Leak: Detecting Small EVAP Leaks

Leaking vapors of fuel are more destructive to the environment than tailpipe emissions. The vapors from an Evaporative emissions system (EVAP) contain volatile organic compounds that can cause health problems and contribute to haze and smog in some cities. In China, much of the pollution in cities is caused by unburned fuel vapors.

Evaporative Vapor Emissions Control

These EVAP monitors can be run in two different ways. Ford, GM and some Asian imports use a vacuum to run the monitor. Chrysler, most European and a few Asian products use pressure to run the monitors.

Diesel Exhaust Particulate Filters: How Do They Work, What Do They Do?

The Diesel Particulate Filter (DPF) is a ceramic filter that has thousands of tiny channels or honeycomb-shaped openings that trap the soot onto the channel walls and prevent the particulate matter (down to 1 micron) from exiting out the tailpipe. The honeycombed inner structure is covered with a layer of a chemical catalyst that contains small amounts of precious metals, usually platinum or palladium.

VIDEO: The EVAP System: Development And Emissions Standards

Andrew Markel discusses the development of the EVAP system as emissions standards changed over time. Sponsored by Standard.

evap-perspective-development-video-featured
VIDEO: Motor Mounts And EVAP Codes

Andrew Markel shows how an EVAP code and a catalyst efficiency code are both related to weak motor mounts. Sponsored by Auto Value and Bumper to Bumper.

motor-mounts-evap-efficiency-codes-video-featured
VIDEO: Lean Codes On EGR Valves

Andrew Markel discusses a diagnostic solution when a vacuum leak appears that can’t be pinned down. Sponsored by Auto Value and Bumper to Bumper.

egr-valve-lean-codes-video-featured
GMC Tech Tip: EVAP Vent Solenoid Replacement (P0449)

Check engine light is illuminated with code P0449 from scan tool (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction).

obdii port diagnostics featured