Autel IM608 Changed EGR Valve: Success!
Change EGR valve and adjust Autel Im608
What is an EGR valve, and how does it work?
EGR stands for exhaust gas recirculation. When engine combustion temperatures are near 2500 F, the formation of smog-causing nitrogen oxides (NOx) increases. However, exhaust gases consist mainly of carbon dioxide (CO2), which does not burn. The function of the EGR valve is to direct small amounts of exhaust gas back into the engine’s combustion chambers to lower the combustion temperature and thereby reduce the formation of smog-producing nitrogen oxides. EGR valves can fail by staying open or closed due to carbon buildup. If an EGR valve is not working, CO2 will be reintroduced into the combustion chamber at the wrong time or in wrong amounts, which will not lower the combustion temperature enough to prevent NOx from rising. EGR valves are often replaced unnecessarily because the EGR ports are clogged and need to be cleaned. Oftentimes, cleaning the EGR fittings alone will resolve concerns.
When does an EGR valve need to be replaced?
Symptoms of a malfunctioning EGR valve include:
Check Engine Light is on for an EGR fault and ports are confirmed clean
Pinging and/or knocking sounds
Rough idle
Reduced power
Reduced fuel economy
Engine stalling/hesitation when accelerating
Tools + Parts Checklist:
EGR Valve
Diagnostic Tool
Gloves
Socket Set + Ratchet
Wrenches
Rust Penetrant
How To Replace EGR Valve
Put the vehicle in park and apply the emergency brake. Consult your owner’s/repair manual to locate the EGR valve.
Turn off the engine and disconnect the battery.
Inspect all vacuum lines for rips, tears, and holes. Replace as necessary.
Remove the vacuum line or unplug the electrical connector from the EGR valve.
Remove the bolts that hold the EGR valve to the cylinder head or intake manifold.
Remove the EGR valve. Be careful to protect the open cylinder head or intake manifold from any debris. Tech Tip: Clean the EGR ports while you are this far into the system
Bolt on the new EGR valve and attach the vacuum line or plug in the electrical connector.
Reconnect the battery.
Start the car and use the diagnostic tool to check for any codes and reset the check engine light.
Do a test drive to ensure the engine is running and idling smoothly.
