MericaMopar
Member
I am having an issue with my '64 Newport, 361, 727 torqueflite auto. Everything is stock except for the 4 barrel Holley street warrior 600 and intake manifold. The car drives fine when it is in gear, idles fine 14AFR, has 21-22 inHg at idle (neutral), in steady state has 18inHg idle in gear.
The issue is whether the car is cold or hot, there is a big lean spike (16-18+AFR) and corresponding vacuum drop (down to 10 or less sometimes). When it is cold, the car is more likely to die and not recover. When it is hot, it is still there and pronounced almost all the time. Ideas for what could be causing this?
Things I have checked:
Timing is at 16 at idle (good strong idle and vacuum reading there, it seems happy)
Vac advance is disconnected for now
transfer slots are square on the carb
idle mixture is adjusted to be 14-14.5 in gear at idle (odd thing about the mixture screws, they need to be only a turn or slightly less out to attain the correct idle mix
Here is a video showing the issue. I change into gear once the cooling fan turns off. I go into and out of gear 3 times, first time it does it bad, second time not at all, and third time it does it but not as bad as the first time.
Thanks for your time.
https://youtu.be/pC94fHT5nAA
The issue is whether the car is cold or hot, there is a big lean spike (16-18+AFR) and corresponding vacuum drop (down to 10 or less sometimes). When it is cold, the car is more likely to die and not recover. When it is hot, it is still there and pronounced almost all the time. Ideas for what could be causing this?
Things I have checked:
Timing is at 16 at idle (good strong idle and vacuum reading there, it seems happy)
Vac advance is disconnected for now
transfer slots are square on the carb
idle mixture is adjusted to be 14-14.5 in gear at idle (odd thing about the mixture screws, they need to be only a turn or slightly less out to attain the correct idle mix
Here is a video showing the issue. I change into gear once the cooling fan turns off. I go into and out of gear 3 times, first time it does it bad, second time not at all, and third time it does it but not as bad as the first time.
Thanks for your time.
https://youtu.be/pC94fHT5nAA