Pinz troubleshooting

[compunerdy]

After having the pinz sit for the last 7 or so years I am finally trying to get it running again. I am sure I have a few posts asking for help but decided to start anew since it has been so long.

1975 710
HISTORY..
When I purchased it,it did not run due to a fuel issue which I resolved. After that I ran it down the freeway going 60+ and it ran great. I did not drive it much before it started to run rough and I have not gotten it running right since.
I installed a Pinz SSI system with new plugs, wires, etc. Rebuilt the carbs, synced the carbs, checked compression, checked valve adjustment.

Here is how it is currently running.

https://cdn.discordapp.com/attachments/ ... 6856_n.mp4
Starting it up and feathering the throttle

https://cdn.discordapp.com/attachments/ ... 9132_n.mp4
This is when I try and accelerate fast.

Any advice appreciated.

[RPinAZ]

I'm anxious to see the responses. Mine does the same thing. I just assumed it was the accelerator pump and was going to address it when I redo the carbs. On mine, once its warmed up, I can very slowly accelerate and it will do so without a stumble. On a normal acceleration though it balks and tries to quit, so I feather it until its off idle then it runs fine throughout the rest of the range.

-RP

[rmel]

Looks like some pre-ignition?

Re-check your PinsSSI timing. It should be 3mm to 5mm advanced.

It's possible the timing disk moved in relation to TDC. The distributor
"pinch-clamp" may be loose or the screw locking the timing disk may
not be tight enough. Either could result in timing drifting while driving.
Both causes happened to me

[compunerdy]

Going to recheck timing but waiting on TDC tool to make sure my mark is in the correct location, etc.

Checked all 4 cutoff solenoids and they click.

Tried to take temps on the exhaust but my IR thermometer was kind of all over the place. After the truck had been shutoff for a bit cylinder 2 exhaust was definitely hotter than the other 3.