Sorry, WRONG!!I believe that since variable vane technology eliminates the need for a blow off valve the egr is a back up if the vane controller fails.
Could be wrong, but this is my story.
Correct, it reduces emissions by recirculating the exhaust. The reason for this is to burn any unburned fuel that is still remains in the exhaust from the first process.Sorry, WRONG!!
EGR = Exhaust Gas Recirculation - This is used to cool down the combustion temperatures and reduce NOx emissions. It is NOT intended to control the turbo back pressure.
There is no safety to a malfunctioning vane; trust me the dealer is wrong. You get a check engine light, and/or a boom/whining noise if the vanes malfunction. In my case when I blew my turbo all I got was a loud WHINING noise. No check engine light, no nothing.Fine. Still does not answer my question regarding a safety to a malfunctioning vane. I put this question to the dealer and they told me the EGR is the safety.
Need more on this:Insane::Insane:
Does anybody no what the egr valve does. I took my truck in for servicr with rogh idle while in drive with foot on brake. The dealer said it was bad. Tnanx for any info
Does my 2002 LB7 have this EGR system?The EGR valve allows Exhaust Gas Recirculation during idle and certain cruise events, in order to improve emissions by lowering combustion chamber temperatures by introducing recycled exhaust gasses back into the intake, diluting the fresh combustible intake charge with non-combustible gasses.
The EGR system on an LB7 is vacuum actuated by a series of vacuum solenoids. An engine mounted vacuum pump creates the neccessary vacuum for the system. There is also a butterfly similar to a choke-plate in the intake manifold that closes during EGR operation, causing an intake vacuum, sucking the gasses back into the engine.
When the dealer is done replacing the EGR, and it still idles rough, have them replace the Fuel Pressure Regulator, a more likely culprit in a rough idle concern.
And you LLY guys, let's keep this on topic, shall we?