Hi, I've got a 600 CFM Electric Choke Edelbrock model #1406 on my 340-4. It whistles. It whistles only in drive, during most normal acceleration. I was just wondering if anyone here stumbled across this before and knew or had any suggestions to fix it. I took a brief look at it the other day, and all the vaccuum lines are on/plugged. It has to be air that is making this sound right? any suggestions would be greatly appriciated, this is getting pretty annoying fast. Thanks, Ian
Places creating whistles include the air cleaner, where it joins the carb, the throttle body, at joints, and vacuum operated devices. You might try the vacuum hose trick, using a long hose. Put one end in your ear, and move the hose around the carb, looking for the loudest sound. This is likely to be the place for the source. Check the throttle shaft, choke assy etc. Ray
It doesn't make sense that it whistles only in Drive. You're saying it won't whistle in reverse, or in neutral when the engine is revved up? I'd expect this to be purely throttle-position related. If it DOESN'T do it at idle, but DOES whistle off-idle, look for a vacuum leak on the ported/timed vacuum hose. I'm thinking ruptured vacuum advance, but it could be anything connected to ported vacuum.
Updates Hey, just wanted to let you guys know a little more about my situation. My carb whistles in drive and reverse, but not in neutral or park. It also whistles when i take off the air cleaner and drive around with it off. i checked the one hose going to the distributor...i think it's called the vaccuum advance,it's fine, and the other 2 caps on the front are good. I am guessing it is something internal.
Did you get this carb new or used? If its used, the previous owner may have drilled holes thru the throttle plates. That's an old trick to help an engine with a big cam idle better.
Updates... No, I bought it new, here is a link to the pictures of it if that helps at all. http://www.cardomain.com/ride/472164/4 I talked to my mechanic about it, he said to just mess around with some stuff, "you can't hurt anything"; but it starts so easily I really don't want to. I don't know what to do, I'm thinking of just letting them figure it out, but I'd rather try and figure it out myself.
