65Fastback
Active member
Hello,
is there a quick diagnose for engine surging on deceleration/coasting in gear below 1200 rpm?
Observed for instance while in town driving when approaching a stop light or so in 2nd gear.
The surging stops immediately when hitting slightly the throttle or when I step on the clutch pedal.
If I do none of the two in low gear, the surge builds up quickly until the whole car kangaroos.
The engine runs excellent in all other scenarios after an intense timing and carb tuning cycle last year.
Holley 7448, 59 mains, 10.5 PV, IMS 1.5 turns, orange cam, 1st hole.
MSD 6, DSII curved by WSA111, 20 degr. initial adv., 37 degr. total adv., ported vacuum, 14 degr. max.
14.5 in hg manifold vacuum at idle.
Idle quality is not perfect but fair, idle speed is a bit unsteady around +/- 10 rpm.
I just don't understand what the engine is doing when surging. And what to try against.
Cheers
Joerg
is there a quick diagnose for engine surging on deceleration/coasting in gear below 1200 rpm?
Observed for instance while in town driving when approaching a stop light or so in 2nd gear.
The surging stops immediately when hitting slightly the throttle or when I step on the clutch pedal.
If I do none of the two in low gear, the surge builds up quickly until the whole car kangaroos.
The engine runs excellent in all other scenarios after an intense timing and carb tuning cycle last year.
Holley 7448, 59 mains, 10.5 PV, IMS 1.5 turns, orange cam, 1st hole.
MSD 6, DSII curved by WSA111, 20 degr. initial adv., 37 degr. total adv., ported vacuum, 14 degr. max.
14.5 in hg manifold vacuum at idle.
Idle quality is not perfect but fair, idle speed is a bit unsteady around +/- 10 rpm.
I just don't understand what the engine is doing when surging. And what to try against.
Cheers
Joerg