I just put a new edelbrock 1405 600cfm on the mav. It ran OK for about 10 miles then started to have a dead spot when I would leave from a light. When I got home it stalled while I was waiting for the gate to open, was hard to start. As I turned onto my street it died and would not start. After pushing it the rest of the way home, I let it sit for about 10 minutes and after holding the gas pedal on the floor it started long enough to get it in the drive way... It was idling very high about 1100 rpm and ruining rough.... Will A fuel pump cause these problems ? I was having a problem with my other edelbrock to, after stooping at the store when I would leave it would sputter and want to stall. It would clear up then be OK again for a while... Help!!! I want to go to the Dixie Stampede... EDIT: It is also back firing through the carb on first start up..
don't think fuel pump would give...high idle. the only thing I see they have in common is...Edelbrock ...
Vacuum leak? Maybe from the brake booster or vacuum advance diaphragm? Or PCV valve or transmission modulator? Is the choke functioning properly? If electric choke are the power and ground connections good?
manual choke, I checked the vacuum lines all seem OK... It is also back firing through the carb on first start up...
OK could it be where I put my dizzy vacuum ? I wanted to try the manifold vacuum... I just switched it back to the timed vacuum side...
Yes On the carb I have two vacuum ports, one manifold and one ported... I had it on the manifold side, now switched over to the ported side... I might have created my own problem..lol
Ford has used both hookups but favors the ported vac connection, which is what I always use, neither should cause the OP's issues... I'll guess it's a problem with the carb but can't say as I walk a wide path around the Ebrock units... The was a bulletin for '67 289 that had a front main bearing knock because of excessive timing advance when the dist was connected to manifold vac, fix was to connect to ported vac on the carb...
Don- I been tuning engines way before the internet came along. Mater of fact I was tuning engines before push-button telephones became popular. The factory hooked the vacuum advance up to manifold vacuum until the early 60's. The reason they started using port vacuum is because of emissions. Once the throttle is cracked open the vacuum is the same on top (port vacuum )of the manifold as it is on the bottom (manifold vacuum). The reason is because the plate(s) are open. All you need to change after going from port vacuum to full manifold vacuum is turn a screw to set the idle down, sorry to hear that you had trouble figuring this one out. I also done the vacuum thing both ways and I like manifold vacuum better. The reason behind the link I posted is because I'm not a person who wants to write a book when I post something on the internet to explain in detail when it is already written in black and white on another web page. I want people to read and figure out their problem so they can learn on their own. Sure, some things need explaining or need to be addressed before they make a big mistake but on the other hand why should we hinder their learning curve by telling them every step by step. They will never lean to ride a bicycle if we don't let go and let them do it on their own. I been working on cars for 50 years and was rebuilding carburetors when I was 8 years old, removing/rebuilding/installing manual transmissions when I was 10. I also lean from experience and I know what I know.
Ford was using ported vac long before emissions came into the picture, my '57, '58, '62, & '64 Fords all had ported hookups(used steel tubing with fittings, no rubber here) and all but the '62 had a road draft tube... I swapped the 289 in the '64 for a 390, that engine also had a PCV system much like the '62 with a 352... Unless the dist is over advancing(yeah common in the single point ford dist) the engine should perform approx same, idle will be slightly higher when connected directly to manifold vac...
Just got home from work, I'm going to drive it for a while and see what happens... My other carb was on this engine since 2006... I think the carb is bad, but I want to be sure before I have them order another one... My instinct said switch to Holley but I didn't listen to me either...lol... So you don't think switching back to ported vacuum is the answer ?
And Edelbrock 600cfm is tuned from the factory for a 350ci motor. It will always take some tuning to get it to run perfect. What fuel pump are you using?
