vacuum advance trouble
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vacuum advance trouble
I have a 400 with stock cam, only mods are intake, edlebrockcarb, electronic ignition and a mallory hyphire VIA. I just put a new vacuum advance in. I cannot get this thing to run well at all. When hooked up to the manifold vaccum on the carb it will idle great and ruun pretty strong untill you get better than half throttle. It spits sputters and sometimes stalls. I have tried adjusting timing with no change except a crappy idle. I have also tried hooking it up to the ported side as well, same thing except worse.
Any ideas???
Drving me frickin nuts, I'm getting smoked by all the ricers now. AHHH can't have that.
Any ideas???
Drving me frickin nuts, I'm getting smoked by all the ricers now. AHHH can't have that.
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From: fairbanks usa
what edelbrock carb do you have?? if it's a 1406(600cfm elec choke) you probably need smaller metering rods. i had a problem with this in my camaro and my buddy has a chevelle that did the same thing it makes the midrange run like crap but smooths out the you the top kicks in. did you use a timing light to check the advance? the centrifical advance mechanism may be sticking. well good luck
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It is the 1406 Edlebrock, took the electric choke off though. it doesn't smooth out when it gets going either. Half throttle or better it does nothing but spudder BAD. It will not gain speed. The distributor is brand new as well, stock but new, with the crane cams XRi point conversion.
If I disconnect the vacuum advance it will run pretty good, but no matter how I change the timing I still get a ping under moderate acceleration.
If I disconnect the vacuum advance it will run pretty good, but no matter how I change the timing I still get a ping under moderate acceleration.
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From: fairbanks usa
did you adjust the idle mixture? i think from the factory they set the screws to 1.5 turns open i'v found that if you make it a bit richer it can make a big difference. do you have a vacuum gauge? it almost sounds like you have a vacuum leak. do you have power brakes? if not make sure the the power brake hook up is sealed up on the back of the carb. spray some wd-40 around the base or the carb and vacuum line conections if there is a leak it will smooth out imedietly. hope you get this setup working the performer series carbs are probably the easiest in the world to tune.
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I have had this setup working before the only difference is the distributor with a working vacuum advance. I have tried playing with the mixture, but it just messed up the idle. The motor idles great it drives pretty well too as long as you don't crack the throttle more than halfway. I checked for vacuum leaks but there are none, and I figured if there was a leak it would be evident at idle.
also NO power brakes
also NO power brakes
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Joined: Dec 2002
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From: fairbanks usa
sounds like the vacuum advance is giving too much advance. i'm not too sure how your distributor set up works but i'd but a light on to see what the hell it's doing. check the vacuum diaphram for leaks. you might be a gear off on the shaft so it's always overadvancing.
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