I threw a cel code p0401 EGR insufficient flow error from my Evo viii. first i checked to make sure none of the obvious occurred like a vaccum hose popping off and checking the electrical connectors on the egr solenoid and manifold pressure sensor (dpfe). All checked good, so i removed my egr valve and determined that it would be good to replace it anyway (95000 miles on it). still got the code. so i then replaced the egr solenoid as per the dealership. still getting the code following that. Anyone have any clue whats goin on? i get the flutter and power loss at a cruising speed when the solenoid wants to open and thats when it pops the check engine light. Could the manifold pressure sensor cause this code? or has anyone had this issue and found something else? plz help, the dealership guys are turds.

 

You 100% positive both vac lines are on? The line behind the manifold likes to pop off

- Bryan

 

where you at in nc?

 

all vaccum lines are connected nor are they dry rotted and cracked, i replaced 2 of them due to that issue. egr valve lines connected, egr solenoid lines connected, no plugs are corroded or cut. all lines hooked up on back side of intake manifold, and lines into the manifold pressure sensor area. and there was some random line goin to blow off valve and bottom side of turbo somewhere, all connected.

 

i was in jacksonville, just recently moved back home to cali, i will be stationed down in san diego soon.

 

Have you also checked the EGR port in the manifold and head? Could be clogged with gunk

- Bryan

 

yeah i glanced in there, but not too hard though, looked good in the dark at the time...i should probably look a little better huh lol, im about to do that real quik. if it is clogged, what would be the best way to clean that out, just some carb cleaner or somethin?

 

Trust us it's ur EGR Hose.... it's hard to get to,, right under the TB,, Feel around but do it when the car is cold..... I just pulled the same code,, hose was off,, after high boost,,, Where u located maybe I can help u,,

 

im up in yuba city right now, will be in san diego next week for good.

 

well if your talkn bout the egr hose on the egr valve that i personally replaced, then its hooked up. and where those hoses connect on the other end of them. am i missing something?

 

Maybe these pix might help,, Found them on evom,, there just for ref...
http://i34.tinypic.com/287lkkm.jpg

http://thefrost.net/randomfiles/rand...o/d3c7de27.jpg

 

thanks...that pic of the manifold was useful. missed 2 or 3 hoses that i didnt know existed, but they were both hooked up.

 

what was fix?

 

The fix is usually that one of the hoses in the EGR system popped off.

 

No hoses popped off!! And still havent gottin it fixed, i probly have a bad ecu maybe, ive changed everything already and cleaned out the egr port..im bout to deploy, ill figure it out when i get back i guess