Tataocb
Well-known member
- Joined
- Jul 11, 2016
- Messages
- 67
- Reaction score
- 0
- Location
- Houston, TX
- My Car
- 1973 Mustang Convertible 351C 2v, auto.
I recently swapped my stock 2 bbl intake and carb for a Weiand X-cellerator I bought used and a new Edelbrock 650 cfm Thunder series carb. My car is a stock 73 351C 2v with a duraspark ignition (bought it like that from the PO) and an FMX. I am having a couple of issues after completing the swap.
1. Explosions through the carb on start up at random. Sometimes when I go to start the car there will be a single explosion through the carb. It seems like it blows a whitish smoke (could it be mixture?) up through the carb, but no fire. After that, I turn the key again, and it starts up just fine. It does not always do it.
Took it for a test drive and found 2 issues:
1. It seems the car is having trouble getting to move from a stop or very low speed. Kind of like the transmission takes a couple seconds to engage. The transmission suffers from "morning sickness" where I have to wait for the car to warm up before it engages gear properly. But I was not having these issues at slow speeds or coming off a stop once it had warmed up before the swap.
2. The car bogs down like its going to stall and even heard a popping sound (like an explosion) one of the times I accelerated to WOT.
The initial timing is currently set to 12 degrees and I am not running any vacuum advance as the total timing (mechanical advance) goes up to about 35 degrees (harmonic balancer marks only go up to 30). I set the idle mixture screws and it idles at 900 rpms. I checked for vacuum leaks with carb cleaner spraying around the base of the carb, the intake manifold, vacuum fittings, and vacuum lines and did not find any leaks. The total manifold vacuum is at 15 at idle. I checked the firing order and it was fine. My next step will be to check the spark plugs.
What is the best way to check the s park plug wires?
Could these 3 things be related?
What else do you suggest I check?
Thanks in advance for any help.
1. Explosions through the carb on start up at random. Sometimes when I go to start the car there will be a single explosion through the carb. It seems like it blows a whitish smoke (could it be mixture?) up through the carb, but no fire. After that, I turn the key again, and it starts up just fine. It does not always do it.
Took it for a test drive and found 2 issues:
1. It seems the car is having trouble getting to move from a stop or very low speed. Kind of like the transmission takes a couple seconds to engage. The transmission suffers from "morning sickness" where I have to wait for the car to warm up before it engages gear properly. But I was not having these issues at slow speeds or coming off a stop once it had warmed up before the swap.
2. The car bogs down like its going to stall and even heard a popping sound (like an explosion) one of the times I accelerated to WOT.
The initial timing is currently set to 12 degrees and I am not running any vacuum advance as the total timing (mechanical advance) goes up to about 35 degrees (harmonic balancer marks only go up to 30). I set the idle mixture screws and it idles at 900 rpms. I checked for vacuum leaks with carb cleaner spraying around the base of the carb, the intake manifold, vacuum fittings, and vacuum lines and did not find any leaks. The total manifold vacuum is at 15 at idle. I checked the firing order and it was fine. My next step will be to check the spark plugs.
What is the best way to check the s park plug wires?
Could these 3 things be related?
What else do you suggest I check?
Thanks in advance for any help.