Re: Eliminating Hot Spot?

Posted by Mike On 2011/5/25 16:38:54

Fred,

It could be just carb related, i had this one professionally rebuilt, but even as much as i'm an expert in my field, i make mistakes so there could still be a carb issue even though this guy is an expert in his, and with lots of packard experience.

I do wonder though, why there are so many of us with this specific issue that people are mixing diesel, etc. in and looking for solutions to issues that don't seem to be worn out parts or classic line vapor lock.

I was thinking that if this is the exact problem, it would be because fuel is more different now than then and maybe this is one of the slight symptoms of the changes over the years. I just didn't know if fuel now had a lower boiling point or something. I viewed this more as an adjustment for the future of the car, like people putting larger jets in for ethanol fuel.



I could do the gas test, and also check hot spark when car is hot, and then also try starting it while manually running the choke. Shutting the choke should give it less fuel and it should fire, right?

If it is the carb with the choke valve sticking or carb main discharge nozzles (because i don't know what those are), it's moot because the 4 bbl is going on. It might be the cause of the rough idle i'm chasing too.

I'm going to rule out faulty coil, and leaky needle and seat because those have been double checked, and coil setting because it starts great cold and when warmed up the throttle blade is wide open straight up and down. That's what you aim for right?