Free Car Repair Advice by Professional Mechanics
How
Does it Work /
How
an EGR Valve Works
How an EGR Valve Works
Introduction
An EGR (exhaust
gas re-circulation) valve is designed to lower NOX (NO2) gases
that occur in the
combustion chamber when temperatures reach over 3,500 degrees
Fahrenheit. NOX gases have been proven to cause brain damage in humans,
therefore EGR valves have been mandatory on most vehicles since 1976. An EGR
valve controls exhaust gases and allows them to enter the intake manifold and
flow into the combustion
chamber at certain times in the operation of the vehicle to reduce
combustion chamber temperatures
Electrically Operated EGR Valve (Linear)
Vacuum Operated EGR Valve
To test your vacuum operated EGR valve remove the vacuum line that is
connected to the valve, apply vacuum using a vacuum pump to the valve while the
engine is
running. If the engine
stalls the EGR system is working, if not, the EGR valve may have failed or the
passages may be plugged with carbon deposits. Testing of a Linear (electric) EGR
valve requires a scan tool capable of applying the valve on command.
How Does it Work
/ How
an EGR Valve Works
Check Manufacturer Specific EGR Valve
Questions and Answers
Related Subjects
Got a Car Repair Question
we will answer it for FREE!
GET AN
REPAIR
MANUAL FOR YOUR CAR.
Get instant access to your vehicles drive belt routing, wiring diagrams, trouble
code information and other available updates and factory bulletins.
| 
