Can EGR cause limp mode?
A faulty EGR can result in excessive carbon/soot at the turbine end of the turbo charger. This could cause the VNT mechanism to become clogged and stick which in many cases will cause engine management lights to appears along with reduced performance known as “limp mode”.
What does EGR valve do Duramax diesel?
Purpose of a EGR Valve This cycling ensures that combustion temperatures will remain cooler than they would otherwise and prevents the formation of NOx gases, which are poisonous fumes that result from the combustion of nitrogen and oxygen under high pressure and temperatures.
What will happen if I disconnect my EGR valve?
If the inactivated EGR valve is in a normally closed position (typical) and you plug the open vacuum line, your engine will run just fine and sometimes slightly better, but will emit a very high level of oxides of nitrogen (NOx) pollution.