hey guys, here's kind of a part two of this thread - https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/91-civic-wont-start-after-rebuild-3140444/

i have a 91 civic lx 4 door, automatic and in california, so it has an EGR (DPFI)

The car runs PERECT with the vacuum line disconnected from the EGR, but runs like complete dog shiza with it connected.

NO CEL with it connected and running poorly & smoking. i get a CEL when I disconnect it but it runs PERFECT

The EGR is clean and holds a seal, whats goin on? maybe the sensors/wires on the EGR?

i rebuilt the head after the head gasket blew and ran into this problem after reassembling the engine

 

did you follow the correct vacuum routing for the egr? there should be a solenoid before the egr that is controlled by the ecu that will pulse the egr when needed.

 

disconnect EGR - it closes and plugs the port. an open EGR = no idle, engine stalls. it's exactly what should happen... except the open EGR at idle part.

the EGR vacuum line, is there vacuum on it all the time? if there is, there should prob not be. if you want to disconnect the EGR altogether and not have a CEL, plugging that line after the solenoid but before the EGR valve should do the trick. if you want to keep the EGR and make it work, replace the solenoid (well, troubleshoot it to make sure it's not the wiring, then replace whatever you find wrong).