Classic Mustangs (Tech)Technical discussions about the Mustangs of yester-year.
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Do you know where the idle adjustment is? are you turning the correct one? Did someone open the secondaries too far at that adjusment? There are many adjusments that could have been made. i would first spary carb fluid around the base to check there for vac leaks.
if this screw has been turned too far it will make the idle high as well
Crap, can I get to that screw with the carb in place. I will spray around tonite. I filled the tranny and it seems much better. Does anybody have pics of the auto linkage for the carb? I don't have this set up on my carb. Not sure if I need it for the 3 speed.
Up date. Previous mechanic connected the PVC vacuum lline to where the Powerbrake vacuum line goes, and the line that goes to the airfilter housing to where the PVC line goes. Since he has no power brake booster, I blocked that opening, re routed the PVC to the correct port, and re connected the air filter housing line. Now I am able to lower the idle. Purring like a kitten. Now I need to take care of the shakes. New engine/tranny mounts, shocks struts, alignment, tire balance, and leaf springs. Everything seems original, so there should be a big difference in performance. Since the car in the day used leaded gas, is there a some additive?
Up date. Set the timing to 6 btc. Wheels balanced, alignment complete, engine running stong, engine and tranny mounts replaced. Still shaking but as bad, found bad u joints, will replace tomorrow. I have a tranny leak where the linkage is connected to the tranny housing. Is this a difficult job? I think I found the correct bushing/seals, but not sure as of yet.
First and foremost BEFORE tuning the carb, you need to be sure the timing is where you need it. Questions I would ask without seeing the car is, is the intake a single plenum or dual? Solid cam or hydraulic? Electronic ignition or points? Cam shaft specs? Lobe separation? The holley is infinitely adjustable, and the size you are using should be fine, for a mild cam and stock converter, and mild gearing. I ran a 650 double pumper on a tall dual plenum intake, and a 750 vacuum secondary, both worked great with no changes to jets.
As stated previously, my Dad had a stoke and does not remember the modifications. So with out dis-assembling, I don't know. The engine would appear to be oringinal. She starts and runs STRONG. Possibly set up for quarter mile racing. I plan on changing the u-joints today and see if that helps with the shakes. I realize the timing and carb set can cause a shake, and adjustments on timing and carb are pretty easy. What about the tranny leak at the linkage connection?
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