Hi, i have a 1970 eldo with 500 engine and 4mv carb, the carbs been previously overhauled and ive had it apart and as far as i can tell its all good and correctly set up. I have put a new "edelbrock 1994" power piston spring in (the original was missing- at the mo its got the gold one in..?) its also got a electric carter 6psi fuel pump located at the rear next to the tank (the mechanical pump was missing and blanked off when i got it).
So my issue is this: today i took it the shops and back, slow and steady and it ran perfect..but! sometimes it decides to cough and choke, could be at the lights around town and it was doing it loads on the motorway when decelerating,. On the motorway it was quite scary as it would cruise great at 70-80 mph but dropping any slower would cause it to cough and also to jolt and surge as if the gears couldnt decide which to choose. Then when i pull over at the gas station it would cut out as if choking on too much fuel.. the only way to clear it is to start it back up and rev hard and after a big cough of black smoke everything would be ticketty boo for a bit.. so my guess is it was choking on too much fuel at the lower speeds and the black cloud cough is it gettiing rid of it.
The carter fuel pump apparently self regulates. so i dont know if there would be any need for a regulator. I checked the float etc and that is all free and seats niceley.
If the car is coughing and stumbling would that cause the gears to shift up and down at 65-70 mph? I think it was the gears changing...i dont have a tach so cant be 100 percent sure.
Also could the fuel pump be overpowering the float needle system and forcing it open?
I need to double check the fuel filters on the carb and in line, and im gonna do a serious vac leak search.
Ive also recently gained a fair amount of oil in the aircleaner pan.
:ill:
So my issue is this: today i took it the shops and back, slow and steady and it ran perfect..but! sometimes it decides to cough and choke, could be at the lights around town and it was doing it loads on the motorway when decelerating,. On the motorway it was quite scary as it would cruise great at 70-80 mph but dropping any slower would cause it to cough and also to jolt and surge as if the gears couldnt decide which to choose. Then when i pull over at the gas station it would cut out as if choking on too much fuel.. the only way to clear it is to start it back up and rev hard and after a big cough of black smoke everything would be ticketty boo for a bit.. so my guess is it was choking on too much fuel at the lower speeds and the black cloud cough is it gettiing rid of it.
The carter fuel pump apparently self regulates. so i dont know if there would be any need for a regulator. I checked the float etc and that is all free and seats niceley.
If the car is coughing and stumbling would that cause the gears to shift up and down at 65-70 mph? I think it was the gears changing...i dont have a tach so cant be 100 percent sure.
Also could the fuel pump be overpowering the float needle system and forcing it open?
I need to double check the fuel filters on the carb and in line, and im gonna do a serious vac leak search.
Ive also recently gained a fair amount of oil in the aircleaner pan.
:ill: