P0401 - Exhaust Gas Recirculation (EGR) Flow Insufficient

This code is very intermittant.

I get a rough idle when applying vacuum to the EGR so the diaphragm is holding up. Is carbon build up common? I dont ***** foot the lady, as I dont run ***** to the walls. The vacuum lines seem to be ok. Could it be the solenoid? How should I pinpoint?

 

I would check for carbon build up on the valve and ports in the intake.

 

^^Check the links on shoebox's sig, he has an insane write-up on the EGR system....

 

I have to replace my EGR about every 35K Because it gets carboned up and leaks. Stes that code every time. I'm on the second one.

 

I'm still using the stocker; I cleaned it up really well inside when I did my cam last year. No problems.

 

As long as the egr holds vacuum, there should be no reason to replace the unit. A good cleaning of the egr and intake ports is all that is needed.