Having Chevelle Problems, Getting pissed off. Gear-Heads please help!

[Dwn4BassAlan]

Alright so I did the oil change today, and it's running the same. It still jerks around and it still almost dies out under braking.

But I think I might have confirmed it's the carb, not a vacuum?? I made 2 u-turns today, and I was not pressing the brakes, and the car completely died out on the first turn, and almost die on the second one. I figured that meant it was the carb, but could it still be a vacuum problem? Most the people who have the problem said it's the floats that need adjusting because gas is sloshing around when you turn or brake and that's what kills the engine. I'll probably have this shop take a look tomorrow though.

[xh3mpx]

Alright so I did the oil change today, and it's running the same. It still jerks around and it still almost dies out under braking.

But I think I might have confirmed it's the carb, not a vacuum?? I made 2 u-turns today, and I was not pressing the brakes, and the car completely died out on the first turn, and almost die on the second one. I figured that meant it was the carb, but could it still be a vacuum problem? Most the people who have the problem said it's the floats that need adjusting because gas is sloshing around when you turn or brake and that's what kills the engine. I'll probably have this shop take a look tomorrow though.

Ok, im not sure I can help you or not, but with my k5 blazer, when I would hit a turn It would die out, It ended up being my Fuel pump. Check your fuel lines, change your filters etc.. if its not the problem its cheap regular maintenance anyway..

other thing is, You said you had your fuel tank built? Did you get a Baffle put in it ?.

spray around your vacuum lines with carb cleaner, and see if the RPMS. change..

[Dwn4BassAlan]

Alright so I did the oil change today, and it's running the same. It still jerks around and it still almost dies out under braking.

But I think I might have confirmed it's the carb, not a vacuum?? I made 2 u-turns today, and I was not pressing the brakes, and the car completely died out on the first turn, and almost die on the second one. I figured that meant it was the carb, but could it still be a vacuum problem? Most the people who have the problem said it's the floats that need adjusting because gas is sloshing around when you turn or brake and that's what kills the engine. I'll probably have this shop take a look tomorrow though.

Ok, im not sure I can help you or not, but with my k5 blazer, when I would hit a turn It would die out, It ended up being my Fuel pump. Check your fuel lines, change your filters etc.. if its not the problem its cheap regular maintenance anyway..

other thing is, You said you had your fuel tank built? Did you get a Baffle put in it ?.

spray around your vacuum lines with carb cleaner, and see if the RPMS. change..

I doubt it's baffled it seems way to slim, it was stock, but just freshly built from modern materials. And I had the fuel pump and guage replaced less than 2 years ago, and it literally just happened randomly after the one time I started it up........

[nickers]

could also be the idle speed tuning on the carb I had a problem where it would idle up then when sitting it would idle so low it would die. you could also try advancing the timing to give yourself more engine vacuum? how big is your cam? if you've got some steep lobes you might be creating low vacuum to start with and when you brake its pulling the vacuum away from the carb which it needs to pull the fuel through the carb. is your distributor a vacuum advance. just trying to think of anything that uses vacuum

[rebel]

it`s probably the brake booster check the hose or plug it close to the manifold and try again but remember the brakes gonna be hard as hell

[Dwn4BassAlan]

it`s probably the brake booster check the hose or plug it close to the manifold and try again but remember the brakes gonna be hard as hell

It wasn't any vacuum it ended up being the carb like I thought.

It was all blocked and plugged with debris, from the gas tank. Somehow it all got through the fuel filter and all the way into the carb and just blocked everything....

so it runs fine now.

[Brandon Bebo]

scrolled all the way to the bottom to reply then seen you fixed it so now i have a comment and dont know how to delete it lol but nice car. my dad has a 72 but its black with white stripes.

[goldeneye4564]

i was going to say something fuel related as well, at the old shop I worked at we had an old ass camino come in with the same problem. fuel system was checked first. fuel tank and lines good, carb was full of shit though. cleaned it out and it ran like a top.

[Mustang06331]

The carb is three seperate fuel sys . Idle , part throttle and wide open throttle . It sounds to me as if you are idling on the part throttle circuit . No matter what anybody tells you trimming must be set before any carb adjustments can be made to work well. Go to the speedo motive website and read engine building 101. Goto pro systems carbs site and read about carbs and how to set them up . Your idle speed should be set by the rear butterflies. The front butterflies should only uncover about .020 of the transition slots located at the base of the carb . Off still need more idle air get it through the back barrels either by adjusting the screw from under or drilling small holes in the back blades and gradually increasing the size until desired IDE speed is achieved . Use a vac gauge and try to adjust for highest engine vac at idle but not through the front barrels.

[Dwn4BassAlan]

Sorry bro, everything has been solved, my cut-off problem was a clogged up carb, and the rough ride / lugging was due to the fact that I have a mismatched timing plate and cover, they aligned them as close as possible though, so it doesn't do it anymore.