what are the symptoms of bad egr valve??? My car is shaking on idle.. Tune up with all has already been done.
Have the vehicle's computer tested for free at VIP Auto,AutoZone or Advance Auto Parts and see what trouble codes it shows while check engine light is on.
rough idle is one//should have ck engine lite on--get can of choke spray and fit the ext tube in it and spray around the egr to see if you can upset the idle
FIrst, locate remove and clean out your IDLE AIR CONTROL VALVE. This is the usual culprit. The EGR valve usually only need to be cleaned, as it gets clogged up with carbon. On may cars, I just disconnect them because they make the inside of the engine dirty. Using more modern spark plugs can lower emissions all by themselves. You can sometimes jolt the EGR back into shape by tapping on it with a hammer. Use Gum-out spray to clean your intake manifold out. It might just clean the EGR, too!
