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Won't run when hot
Posted: Sat May 01, 2021 11:52 am
by leapfrog85
Hey all,
So, the other day i was driving my '75 710M when I pulled up to a stop light and it backfired really loudly and then stalled. I then drained the battery trying to restart it. After getting a jumper pack I tried to restart it again with no luck. I pulled the center lead on the distributor to make sure I was getting a spark at least that far, and I was. I also shot some ether in the intake to see if it would fire that way with no success. I ended up having it towed but the next day it started and drove just fine. Why would it stall and not restart, even with ether, only to run fine when it cooled down? Any ideas will be greatly appreciated.
Aaron
Re: Won't run when hot
Posted: Sun May 02, 2021 8:43 am
by rmel
Possibly Vapor lock ? What was the temperature and altitude where this happened.
And how full/empty was your fuel tank.
If this happens again, try removing the top cover off the dog house, wait a couple of
hours and attempt to restart.
A friend had this problem on hot days at altitude. He decided to flip over to a
electric fuel pump, rather than rebuilding the mechanical pump.
Re: Won't run when hot
Posted: Sun May 02, 2021 9:22 am
by leapfrog85
Vapor lock was my first thought too. Would that account for the loud backfire, or for it to stall? I'm at less than 1,000 feet and the temp was in the mid 50s, which would kind of make me lean away from vapor lock. Plus, I would think it would start with the ether.
Thanks
Aaron
Re: Won't run when hot
Posted: Sun May 02, 2021 10:10 am
by rmel
Those conditions makes vapor lock less likely.
Re: Won't run when hot
Posted: Mon May 03, 2021 1:05 am
by David Dunn
Look at the coil. That's the same symptom as a coil going bad. A coil breaking down will get extremely hot and spark gets weak. It will continue to run, but if stopped , it won't restart for a 1/2 hour or more until it cools down. This can also be caused by overvoltage from a failing ballast resistor or a bad voltage regulator supplying over 30+ volts to the electrical system.
If it happens again or take your Pinz for a 1/2 hour drive or so, then check the coil to see if it's hot to the touch
Re: Won't run when hot
Posted: Mon May 03, 2021 1:26 pm
by leapfrog85
So, even though I had a spark, it might not have been a strong enough spark? I'll give this a look when I have time again.
Thanks
Aaron
Re: Won't run when hot
Posted: Thu May 13, 2021 6:48 pm
by murrayjp
evening all
got a question on keeping the engine cooler.
can one reroute the air cleaner like a 716/8 to get cold from outside the engine compartment.
could a ele. fan be installed to increase air flow across the engine and along with adding one to oil cooler , since the air filter has been rerouted
FLa is too darn hot in the summer and it's summer 9 months a year