My cars service engine soon light came on. I got it scanned, and it's the egr. Will it eventually go off? Or what can I do to get the light off? Kinda bugs me..

 

try cleaning it? http://shbox.com/1/4th_gen_EGR.html

 

What was the code? Some of the EGR codes can be fixed by cleaning others sense failure of the unit and cleaning will be of no help.

Massey

 

diaphragm could be torn

 

All 4th gen EGR systems are digital and do not have a diaphragm. They use 3 soloniods to adjust the amount of flow to the engine.

Massey

 

Diaphragm type vacuum operated EGR valves are ancient history. The exhaust gas flow can't be controlled precisely enough. A lot of really modern cars don't even *have* EGR valves -- exhasut gases are recirculated using their variable valve (intake/exhaust) control systems.

The 3800 EGR valve (and even the 3400 before that) is an electric-only digital valve. The 3400 used 3 on/off style solenoid-operated valves. The PCM can operate #1 or #2 or #3 individually or #1&2 or #1&3 or #2&3, even #1, 2&3, to get the desired exhaust gas flow.

One of the solenoids can stick or fail electrically. An orifice can be plugged by debris (carbon). The tube between the exhaust manifold and the valve can carbon up as well.

On the 3800 the EGR valve has one large winding that is divided into several sections which can be energized separately. That allows the single valve pintle to be opened various amounts but in steps for precise control.

My point is that an EGR code is not necessarily a death sentence for the EGR valve (but this is a common service station reaction). Then, when the new valve doesn't solve the problem they can shrug and tell you that electrical parts are not returnable and you probably needed the valve anyway becasue your car is old and has XXXXX miles on it.

If you can, find someone with the GM Service Manual for your exact car and look up the trouble tree diagnosis steps for the code you see.

 

It's fixed.. I did the WOT technique and it went off.