So this happened twice today. I drove my 79 305 around town to pick up a few things and do a few odd jobs. When I got back to the house after about a 15-20 minute drive I let the car idle in my driveway as I got outto opened the garage door (need a new opener). When I got the car about a quarter of the way in the garage the engine died and would not restart. I went inside for about 30 minutes and then came back out. It started right up. I drove it again later tonight and it died in the parking lot of my destination as I pulled into the parking space(agian it would not restart). It fired right up when I left a few hours later and made it back to my house fine. I assume something is over heating and getting clogged...not sure where to go with this one...any ideas would be helpful. THANKS

 

the most likely reason that it wont start back up until you let it sit is because its flooding, why its flooding... i dont know. next time it dies and wont start back up keep your gas pedal floored for a while to air out your motor and then try to start it again. does it seem to be running rich? is the idle set too low. when you try to start it back up do you pump the pedal, you shouldnt have to because the motor is already warmed up. pumping it more would cause it to flood.

 

Try replacing your ignition coil. A faulty coil can work fine until it heats up. Then it overheats, goes dead and kills the engine. After the coil cools off, it will work again until it overheats. I have experienced this more than once.

 

Yeah I have had that problem with the coil as well, actually on this car.I replaced the coil at the end of last year. The symptoms of the car do not closely resemble that of my previous bad coil. It seems to me that its more of a flooding issue. Because after it dies it normally catches the spark for about a second on the first attempted restart and then refuses to restart after that...

 

Next time you get the engine to kill (do it at home purposely), check with either a spark tester or a timing light as you crank it over to see if you still have spark. If you have spark, look down the carb and pump the accelerator arm on the carb. If you don't see any gas squirting, you have a fuel supply problem. Believe it or not, I have also had a mechanical fuel pump that would go dead after heating up.

 

So when I went to check out my problem I noticed I had a new fuel line for my newly installed carb resting on one of my valve covers. Could this have vaporized the fuel when the engine got up to the right temperature? Then it would have gone back to fuel after sitting and cooling down?WellI shortened the fuel line andfixed it into a position with plenty of distance from anything that would heat up...Ill see if this fixes my problem...

 

i dont think that would be the problem unless your valve covers get really really hot and it boils the gas into the vapor really fast. when the motor is running the fuel is constantly running through the lines and wont be sitting on it long enough to vaporize it. if that was the case it would be dieing on you all the time including on the road. it seems its only doing it when your idle goe back down.

one possibility might be that you have one or more spark plugs craping out on you. if the spark plug isnt working to its full potential then when you give it gas it gets too much and it cant ignite all of it which causes that cylinder to flood. then when you park the car or your idle goes down your motor dies because of that cylinder being flooded. its a far shot of that being the problem but its a possibility. has the car been seeming to bog down latley and seem under powered?

 

With my newly placed fuel line, I just ran the car for half an hourand no problem, but i still need to test drive it. I had been wanting to check the plugs anyway, so that sounds like a good idea to me. I have not noticed the car bogging down or seeming underpowered...

 

if it hasnt been under powered or bogging down then it wasnt the plugs but its always a good idea to change them once in a while. i hope the fuel line was the problem because it was an easy fix. im not sure what the boiling point of gas is but if somethings wrong with it all kinds of crazy **** happens.