minibeer

my 73 340 duster has a 1407 edelbrock carb on it. car idle fine when 1st started and cold, but as I drive it and it gets hot , it seems to idle high when stopped at a light or whatever,mild build , headers , wiend manifold,by the way no choke on it. any ideas ? thanks

moe7404

first thing to try. check for a vacuum leek. 1. with engine running spray some WD-40 around the base. if it has a leek the RPM will change. and you might hear the WD-40 going in to the carb. 2. get a small vacuum hose. put one end in your ear. pass the other end over the base edges. if it has a leek you will hear it.

TVLynn

Too lean !

minibeer

sort of new to this car, and I am not a full mechanic. if carb is to lean , what adjustment should I make? thanks

moe7404

it just came to me. you may have put a square bore carb on a spread bore manifold. this will make the engine VERY lean. if this is the case you might need a specl steel plate with a specl gasket on the bottom that comes with the plate. and a regular gasket between the carb and specl plate. edelbrock has the plate you need. EDIT: i just checked a wiend 8007 is a spread bore manifold....... a 8022 is a square bore manifold.

RacerHog

I agree... Lean or vacuum leak....
Might try opening up the Idle Air mixture screws 2 more turns and see if that helps..

minibeer

just went for a ride its 85 degrees here. I noticed when I come up to a light , the idle is high , not real bad , but definitly noticeable. while stopped I give the throttle a quick blip and the idle returns to normal. its almost when you are cold , with a choke and idling high when you start up, then you kick her down after a warm up and you are @ normal idle. so maybe a carb linkage slight adjustment ?? edelbrock 1407 with no choke ------ not finding any vac leaks. have not tryed the idle air mix screw yet, just want to rule out any other small adjustments

minibeer

did some you tube research on this and the edelbrock guys are calling this idle surge which like you guys say to lean, i have never had an eddy carb on a car and this was on my car when i bought it so not totally in the know on adjustments.eddy guy says to adjust air idle screws. which way should i turn them to lean things out?? thanks for help

moe7404

i if it is lean at idle, as it is idling cover the air horn with your hand, it will increase RPM, if it is lean.

TVLynn

Check the mixture screws should be at least 2 turns out. Make sure the return spring has enough tension