Erg valve, needs to pass smog. Please help.

[Drewthebear]

97 gst, 5 speed, 110k miles original motor, all stock but k and n intake and 4" Catback exhaust

I have re searched this in multiple sites and forums, cel check, I get 2 errors, both p0400. This only started recently, (exhaust and intake were on well before this started happening)

IMPORTANT: My smog check is up and I need to smog it LEGALLY, and soon. I found a broken line in the egr, fixed it, and also cleaned out all the carbon, cel came on again after 40 miles.(Still with two p0400 codes) A lot of the threads say remove the erg valve, but I need it to pass smog, and on top of that I live in California, one of the states with the most amount of exhaust and emission laws. Any advice? Just need to have this fixed and cel off to smog it, heard a lot about a map sensor?

 

[luv2rallye]

P0400 can be EGR valve, EGR solenoid, EGR valve control vacuum, MDP sensor, harness/wiring.

 

[H@xtGSX]

My first 2 bets would be cracked and rotting hoses and a bad MDP.

 

[Drewthebear]

Yeah i cleaned the hell out of the egr valve and replaced a snapped tube, still cel, p0400 and another p0400 that is "pending" I was considering getting a new solenoid as the tube exploding may have caused a malfunction,

is the mdp sensor the same as a map?