GM EVAP Vent Solenoid Testing
2002 Chevy Silverado 4.8L with a P0449 EVAP Vent Solenoid trouble code. For
more info. see www.autocomputerstroubleshooting.com
Automotive Evaporative Emissions - Part One
From www.autofixworld.com: Part One of a two-part video describes how
onboard monitors test vehicle fuel containment systems for fuel vapor
leaks. Three types are discussed: pressure test; vacuum test; and natural
vacuum leak detection.
Automotive Repair: Diagnosing EVAP Systems, The Trainer, June 2011
http://workshop.search-autoparts.com Diagnosing "Check Engine" light
complaints is a common task for most shops. And a leading cause of an
illuminated MIL (Malfunction Indicator Lamp) is a fault in the evaporative
The primary function of the evaporative emissions system (also called the
EVAP system) is to prevent fuel vapors in the tank from being released to
the atmosphere. Instead, the vapors are collected in an activated charcoal
storage tank, or canister. The ECM controls the purge of the canister by
opening or closing a solenoid valve connecting the canister to the intake
manifold of the engine, and allows the stored vapors to be fed and burned
in the engine.
The EVAP system is tested by the ECM to make sure all the components
function as they are supposed to, and checks the system for leaks to the
atmosphere. A pair of EVAP related codes on Pete's 2007 Toyota, and how he
approached their diagnosis, is the topic of June's "The Trainer". Click
this link to subscribe to Motor Age! http://bit.ly/MA_YT_freesub
EVAP System Operation
EVAP System Operation
Amazon Printed Books
Amazon Kindle Edition
Explain the operation of the EVAP system. The EVAP system is in charge of
recovering the excess fuel vapors and re-introducing them into the engine.
It isn't just an emission system. If it malfunctions is also has a huge
effect on engine performance and certain components operation will be
cancelled by the ECM if the EVAP system fails. Learn how they operate here
and how to test. The OBD-II scanner or Scan-1 is used to diagnose these
systems and evaluate the process. See how it works.
Amazon Printed-Books & Kindle:
Google Play Android APPs:
Amazon Video DVDs:
Barnes & Noble Nook:
Apple iTunes iPad:
How to Fix A Check Engine Light : P0455 Emissions Purge Valve Replacement
A check engine light can be caused by many different problems. Fortunately
the ECM will generate and store a code when a component fails or near
failure. This points us in what direction the issue is and guides on the
The automobile consist of:
• Fuel System: Purpose is to deliver fuel to the engine. It consists of
the fuel tank, pump, gauge/sensor, filter, pressure regulator and
• Air Intake System: Purpose is to clean and direct outside air into the
engine. It consist of air filter, ducts, air plenum and intake manifold.
• Exhaust System: Purpose is to
direct Exhaust gasses out of
combustion out of engine. It consists of the Exhaust manifold, converters, pipes and
• Cooling System: Purpose is to remove excess heat from the engine. It
consists of water pump, hoses, radiator, thermostat, cooling fan and
coolant recovery tank. Also the oil system serves as a cooling system as
well as a lubricating system. It consist of oil pump, pan, filter and
1. Clutch: Purpose is to connect the engine and transmission together. It
consists of clutch drive disc, driven disc, release bearing, clutch fork,
cable, slave cylinder, master cylinder. There are three types of clutch
systems: mechanical, cable and hydraulic.
2. Transmission: Purpose is to match engine speed to road speed. Two types
used are manual or automatic. These consist of gears, linkages, cables and
converters for automatics. A manual is connected to the clutch by a
flywheel and automatic by a flexplate.
3. Driveshaft: Purpose is to connect the transmission to the rear axle. It
consists of a slip yoke, shaft and universal joints.
4. Rear axle differential: Purpose is to change the angle of motion from
engine to the wheels. It also divides torque between the wheels. It
consists of a ring and pinion gear, carrier, bearings, crush sleeve and
5. Wheels/Tires: Purpose is to provide traction to the road as well as
carry the weight of the vehicle.
Vehicle Control Systems:
1. Brakes: Purpose is to slow and stop the vehicle. It consists of master
cylinder, brake Booster (vacuum or
hydraulic), calipers, drums, pads and rotors.
2. Steering: Purpose is to direct vehicle in the required direction.
Consists of steering gear (rack & pinion), steering wheel, column,
inner/outer tie rods, pump, reservoir, hoses and pipes.
3. Suspension: Purpose is to provide stability and handling while also
providing comfort to the ride. Consists of shocks, struts, sway bars, end
links, springs, trailing arms and bushings.
1: Heating Ventilation Air Conditioning (HVAC): Heats and cools interior
air to passenger comfort. Also circulates outside and inside air.
• Air Conditioning: Consist of condenser, compressor, accumulator
(receiver/dryer) orifice, expansion valve, hoses, evaporator, controls,
actuators and modules.
• Heating: Consists of heater core, valves, hoses and switches.
1. Power Generation: Creates electrical power to run all the electrical
systems. Consists of the alternator.
2. Power storage: Stores unused power to start the car and supply voltage
to the alternator to create more electricity.
• Both systems consist of wiring, harnesses, fuse, relays and modules.
How To Find A Vacuum Leak - EricTheCarGuy
Vacuum leaks are one of the biggest causes of engine performance problems.
This video is pretty straight forward in it's approach to finding a vacuum
leak. On thing I might mention is that not all vacuum leaks are at the
engine. Some HVAC systems run on engine vacuum and can cause a leak under
the dash in some cases. I've even seen vacuum operated door locks. Just be
sure to be careful spraying flammable stuff on a hot engine, you don't want
to take one problem and make it a whole lot worse. You can also use a spray
bottle with water to do this same test. It may not be as effective, but you
don't have to worry about spraying a flammable substance on a hot engine.
For more information on diagnosing engine performance issues, check out
this article I wrote.
The best place for answers to your automotive questions:
Information on Premium Membership:
Due to factors beyond the control of EricTheCarGuy, it cannot guarantee
against unauthorized modifications of this information, or improper use of
this information. EricTheCarGuy assumes no liability for property damage
or injury incurred as a result of any of the information contained in this
video. EricTheCarGuy recommends safe practices when working with power
tools, automotive lifts, lifting tools, jack stands, electrical equipment,
blunt instruments, chemicals, lubricants, or any other tools or equipment
seen or implied in this video. Due to factors beyond the control of
EricTheCarGuy, no information contained in this video shall create any
express or implied warranty or guarantee of any particular result. Any
injury, damage or loss that may result from improper use of these tools,
equipment, or the information contained in this video is the sole
responsibility of the user and not EricTheCarGuy.
Finding Engine Vacuum Leaks With A Cigar
Scotty Kilmer, mechanic for the last 43 years, shows how you can find
engine vacuum leaks in your vehicle using cigar smoke. It really works as
well as a thousand dollar smoke machine.
BMW Service - Charcoal Canister - How & Why to eliminate it
The charcoal canister on your BMW motorcycle is useless. Yes, I do supoport
the environment. These 'soup cans' are not found on BMW's in other
countries and they are detrimental to the performance of your engine and
costly to your wallet when they clog & fail. Remove it and enjoy your
machine as it was intended.
Evaporative Emissions Check Engine Light
A video that may help others to pass an MVD Emissions inspection. The video
contains information about OBD2 data codes and explains in part, the
evaporative emissions system in today's automobile
Toyota EVAP P0441 and P0446
This video demonstrates how to diagnose and repair common Toyota EVAP codes
P0441 and P0446. We use a scan tool and everyday tools everyone should have
for this diagnostics. We also use Identifix as a reference to help with the
bench testing of the Vacuum Switching Valve VSV.
"The information presented in this program is based on a specific
diagnostic case and might not directly apply to the vehicle you are
repairing. We do not represent or warrant that the information presented
is complete or error free. Please take all safety precautions. We
disclaim any and all liability for losses, injuries or damages in
connection with your repair."