Flat spot when accelerating from idle
Asked by 1966mac Jul 10, 2017 at 10:02 AM about the 1966 Chevrolet Chevelle
Question type: Maintenance & Repair
I have a 1966 chevelle with a 327 4 speed. The car starts fine, idles good and operates normal when accelerating except when it is warm from an idle. car has lots of power when driving, just a problem from idle. I replaced the fuel filter and carb and still has same problem.
6 Answers
Thanks, I was wondering if it could be a vacuum issue. I was sure it was the accelerator on the Q jet, so I borrowed an Edelbrock from a buddy I know was good as he had it on his 63 327 Impala. Car acts exactly the same with the different carb. I bought the car in the winter and am just getting around to driving it and getting the bugs out now. Car is actually unsafe when entering a roadway.
beatupchevy answered 6 years ago
none of the fuel lines are rusted are they ? The ones going over the rear axle ?
Thanks guys, fuel lines are good and nothing showing up in the fuel filter. I will check the centrifugal weights and timing chain. I guess i will have to pull the cover. Would a loose timing chain show up with timing light? Would the light be bouncing around?
Well the weather here has been rain, rain, rain. Got a bit of a break yesterday and after chatting with a buddy who has a 63 Impala with a 327 4 speed like myself, he told me he disconnected his vacuum advance and his car ran much better. I plugged mine and took it for a ride and it ran much much better. I didn't get it real warm before it started spitting again. So, what does this tell me? Thanks again.
Forgot to mention that I have an HEI ignition on the car.
I am hoping to check the timing today or tomorrow. Should the base timing be around 10 deg. BTC ?
