Hot starting problem
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 2,142
Likes: 195
From: Englewood FL
Hot starting problem
Have a 1979 with an L82 and automatic. It has the stock rochester
carburetor. Car starts great when cold. Even after sitting for weeks,
depress the accelerator once to set the choke and it starts
almost immediately.
Problem: After the car is fully warmed up, let it sit for a half hour or
more and it is difficult to start. About the best way to start it then is
to leave the accelerator completely depressed until it starts. Then it
will idle so slowly that it will stall unless you keep some pressure on
the accelerator for 10 seconds or so.
If you restart it within a few minutes after turning the warm engine off
it starts fine.
What is the problem? Does the choke need to be turned to a richer
position so it provides some partial choke to the warm engine?
carburetor. Car starts great when cold. Even after sitting for weeks,
depress the accelerator once to set the choke and it starts
almost immediately.
Problem: After the car is fully warmed up, let it sit for a half hour or
more and it is difficult to start. About the best way to start it then is
to leave the accelerator completely depressed until it starts. Then it
will idle so slowly that it will stall unless you keep some pressure on
the accelerator for 10 seconds or so.
If you restart it within a few minutes after turning the warm engine off
it starts fine.
What is the problem? Does the choke need to be turned to a richer
position so it provides some partial choke to the warm engine?
Instructor
Joined: Apr 2007
Posts: 184
Likes: 1
From: Atlas is shrugging KC, MO area
If you have to keep accel. fully depressed to hot start, it sounds like you're flooding. Could be float level set too high and then with hot soak, some gas boiling over into manifold. Or could be a bad needle & seat that's letting fuel in as it gets hot and expands. Don't think you need any choke with a warm engine.
Tech Contributor
Joined: Aug 1999
Posts: 14,370
Likes: 6,364
From: At my Bar drinking and wrenching in Lafayette Colorado
First, verify that the choke is, in fact, fully open when the condition occurs. If the choke is closing, you may have a problem with your choke hot air tubes or other choke adjustment problems. You can get my choke setup paper by e-mailing me:
V8FastCars@msn.com
Also, check your choke pulloff by sucking on it with a long vacuum hose. Many are ruptured and do not work right. Replace it if needed.
If all checks good on the choke system, chances are that you either have a sunk float or a leaking needle/seat that is allowing the car to flood out after shutdown. Replace the parts.
