Re: Starts easily when cold, but won't idle when warm

["Jim Blair" <carnuck@xxxxxxxxxxx>]

Does it idle when fully warm? If so, the choke needs tightening a little or 
the power valve is incoorect/plugged up, or float level needs to be raised 
slightly. (this is assuming you have no intake leak and the power brake 
booster isn't near death's door. Easy test is plug off the hose and see if 
it works)


From: Jerry Phillips <jnpvegas@xxxxxxxxxxxxx>
To: mail@xxxxxxxxxxxx
Subject: Starts easily when cold, but won't idle when warm

The engine ('68 390) starts fine when cold, but when the choke starts to 
come open, rpms start to drop and it is necessary to bump the throttle to 
keep it going.  The slowest it will run is about 1,200 rpm at steady 
throttle, anything slower and it stalls.

New:  Plugs, wires, coil, points, condenser, cap, battery cables, relay, 
relay to starter cable

Replaced: rebuilt Holley 4160 (vacuum secondary) 600 cfm with electric choke

Timing at 5 degrees BTC, at 700-800 rpm in neutral.

I have tried it with the idle mixtures screws at one and one half turns out, 
as recommended in the Holley rebuild kit literature, up to three turns out 
as recommended on the Holley web site.  Doesn't seem to matter, it still 
stalls as the choke plate opens out.  As the engine warms up, the only thing 
that keeps it running is more gas.

Anyone got any ideas?

Thanks,

Jerry Phillips
Las Vegas

'68 AMX 390