bc2planker
Cadet
- Joined
- Jul 2, 2021
- Messages
- 6
Hello. I am going nuts trying to solve this issue...
VP 4.3Gl Engine. Bogging @ 3000rpm, only under load. 2 barrel Holly carb, no secondary.
First thing was I found water in the fuel. Dealt with that, confirmed good gas. Still bogging.
Then I rebuilt the carb using Holly rebuild kit. Replaced everything I could from the kit. Then it was stalling when put into gear. If I quickly moved into gear and more throttle, it would get past the stall and run well. I could run up to 4500rpm, no issue.
I tested vacuum and it was low, so adjusted the carb idle and both jet screws. This fixed the stall when putting into gear issue, but the bogging @ 3000 returned. Vacuum improved to about 18.
It had a who knows what fuel pump, output 2psi at idle, 5-6psi higher throttle. I replaced with new fuel pump. Then it was bogging @ 2000rpm!
Notice fuel lines to the pump were 5/16, rather than 3/8, so replaced those.... back to bogging at 3000rpm. Runs fine below that, but feels a little sluggish.
Have also replaced spark plugs, inspected spark plug wires and confirmed good compression.
Next step I was looking at was adjusting the timing. Any other ideas??
Thanks!
VP 4.3Gl Engine. Bogging @ 3000rpm, only under load. 2 barrel Holly carb, no secondary.
First thing was I found water in the fuel. Dealt with that, confirmed good gas. Still bogging.
Then I rebuilt the carb using Holly rebuild kit. Replaced everything I could from the kit. Then it was stalling when put into gear. If I quickly moved into gear and more throttle, it would get past the stall and run well. I could run up to 4500rpm, no issue.
I tested vacuum and it was low, so adjusted the carb idle and both jet screws. This fixed the stall when putting into gear issue, but the bogging @ 3000 returned. Vacuum improved to about 18.
It had a who knows what fuel pump, output 2psi at idle, 5-6psi higher throttle. I replaced with new fuel pump. Then it was bogging @ 2000rpm!
Notice fuel lines to the pump were 5/16, rather than 3/8, so replaced those.... back to bogging at 3000rpm. Runs fine below that, but feels a little sluggish.
Have also replaced spark plugs, inspected spark plug wires and confirmed good compression.
Next step I was looking at was adjusting the timing. Any other ideas??
Thanks!
