th400 to manifold vaccume? How do I fix?

[78Suburban]

I knew the rubber was a little cracked on this thing. I'm not sure if a vaccume leak would have caused all the terrible performace problems I've been having. And before I rebuilt my carb, I could put my hands over it, and the idle speed would not increase, which led me to belive I didn't have a vaccume leak. Is this meathod fool proof? And I never had the idle increase spraying this bad boy with carb cleaner. Now that I've rebuilt my carb, I had a small vaccume leak, and now that I've corrected the vaccume leak, it won't fire up and run anymore (the air horn screws weren't tight enough, and now that they are tight, no idle ) Now its backfiring through the carb alot more too, even when I try to crank it.



Long story short, I know I have a vaccume leak now, because I got curious and have this little line a tug, and it pulled on out of the manifold. So can I get another little rubber sleeve to slide over it from the parts store? The t-fitting that comes off of it goes to the Air Conditioner's climate control box (I'm seriously considering pulling the AC anyway, so I may end up plugging this off. I don't know if this could cause the engine to stumble severly and poof through the carb, especially under load and over half throttle... BUT I KNOW, THIS ISN"T A GOOD THING

thanks,
James

 

[muscle]

new piece of vac hose... done deal

 

[78Suburban]

new piece of vac hose... done deal

So all that is is a small length of vaccume hose?? It doesn't requre some specially shapped rubber piece? cool

 

[Chevy305]

you'd be surprised how much a 2in piece of hose matters.

 

[4X4HIGH]

I knew the rubber was a little cracked on this thing. I'm not sure if a vaccume leak would have caused all the terrible performace problems I've been having. And before I rebuilt my carb, I could put my hands over it, and the idle speed would not increase, which led me to belive I didn't have a vaccume leak. Is this meathod fool proof? And I never had the idle increase spraying this bad boy with carb cleaner. Now that I've rebuilt my carb, I had a small vaccume leak, and now that I've corrected the vaccume leak, it won't fire up and run anymore (the air horn screws weren't tight enough, and now that they are tight, no idle ) Now its backfiring through the carb alot more too, even when I try to crank it.



Long story short, I know I have a vaccume leak now, because I got curious and have this little line a tug, and it pulled on out of the manifold. So can I get another little rubber sleeve to slide over it from the parts store? The t-fitting that comes off of it goes to the Air Conditioner's climate control box (I'm seriously considering pulling the AC anyway, so I may end up plugging this off. I don't know if this could cause the engine to stumble severly and poof through the carb, especially under load and over half throttle... BUT I KNOW, THIS ISN"T A GOOD THING

thanks,
James

If you put your hands over the carb and it doesn't die then you have a big vacuum leak somewhere or possibly several small leaks. The reason the engine didn't die was because it was getting air from somewhere else IE: vacuum leak.

 

[78Suburban]

well, before I rebuilt the carb, it would choke the motor out.. then afterward it wouldn't, because I hadn't tightened the screws on the carb down enough...I replaced the link with vaccume hose... but I've got a bigger problem on my hands now... the fun rocker