Posting a new thread in hopes i get more visibility here than my project thread.
Basically I've got an 80s 305 im trying to get tuned properly. Its always idled like crap (shaky, exhaust sound is "huffy puffy"), and this past weekend the EGR valve failed. As an emergency fix, I blocked it off but it seems this wasnt a good solution since it is spark knocking under load now. Looks like my options are to replace the EGR valve or keep it blocked off and re-configure the vacuum advance in the distributor. Engine seems to run very smooth at RPM / under load, good vacuum etc. Im assuming there is a vacuum leak hidden somewhere thats affecting the idle, or *possibly* a dead cylinder.
I guess what I'm looking for is opinions on this. Is deleting EGR a beneficial move or not and worth recalibrating the carb/distributor? I'm reading it does a lot of good things but my highest priority is to make this thing run (idle) *correctly*. The idle isnt bad, but every other 350 ive owned idled smooth as a top, and so does a buddies 305 K5 that is all stock also. The idle could very well be nothing to do with emissions controls, but I'm trying to eliminate variables. I'm picking up a new EGR valve this afternoon to try that as a solution for now.
I'm also looking at putting headers on it, but there is some kind of heat riser built into the passenger exhaust manifold that i believe dictates the engagement of the electric choke. Am I going to lose the functionality of the choke if i remove that? Or am I not understanding this system correctly?
Any advice appreciated
Basically I've got an 80s 305 im trying to get tuned properly. Its always idled like crap (shaky, exhaust sound is "huffy puffy"), and this past weekend the EGR valve failed. As an emergency fix, I blocked it off but it seems this wasnt a good solution since it is spark knocking under load now. Looks like my options are to replace the EGR valve or keep it blocked off and re-configure the vacuum advance in the distributor. Engine seems to run very smooth at RPM / under load, good vacuum etc. Im assuming there is a vacuum leak hidden somewhere thats affecting the idle, or *possibly* a dead cylinder.
I guess what I'm looking for is opinions on this. Is deleting EGR a beneficial move or not and worth recalibrating the carb/distributor? I'm reading it does a lot of good things but my highest priority is to make this thing run (idle) *correctly*. The idle isnt bad, but every other 350 ive owned idled smooth as a top, and so does a buddies 305 K5 that is all stock also. The idle could very well be nothing to do with emissions controls, but I'm trying to eliminate variables. I'm picking up a new EGR valve this afternoon to try that as a solution for now.
I'm also looking at putting headers on it, but there is some kind of heat riser built into the passenger exhaust manifold that i believe dictates the engagement of the electric choke. Am I going to lose the functionality of the choke if i remove that? Or am I not understanding this system correctly?
Any advice appreciated
Comment