difficult to start when hot

[kajsdf]

i have a new issue i am having some trouble tracking down...with the carter, my eagle was occasionally difficult to start.  it has improved somewhat with the install of the 2100, but not completely.

car starts great when cold -- absolutely no problems.  if it was cold outside with the carter, i wouldn't even be able to get it to start.

when engine is close to operating temperature, starting usually requires holding throttle wide open, then it coughs and sputters a bit, then stabilizes.  i assume it is choking on excess fuel, but i do not know for sure.

emissions stuff is not hooked up, no vacuum leaks i can find. egr does not leak.  spark plugs are good, plug wires are new-ish (within last few months from tfi/miu) along with coil.

could it be the ignition box going out?  i'm a little stumped on this one.

[GRONK]

Could be base timing, could also be resistance to the coil.  Everyone, please chme in if Im incorrect, but the running voltage to te stock coil is 6-9V, but on start up, the coil gets a ful 12V (bypassing the main resistor wire) 

Thinking more about it, could be a slight air leak in the fuel line and or pressure building in tank when hot.

Just throwing some ideas out there.

Is the choke properly opening when at operating temp?

[kajsdf]

choke works great at operating temp

if it was timing, am i too far advanced?

forgot to include in original post, but i do have to work the throttle a bit to keep it from dying until everything evens out

[GRONK]

What is your elevation and what is your base timing set at? (at 650 RPM)  Sounds like you might be too far retarded.

[mudkicker715]

To eliminate the tank pressure loosen or take the cap off the tank for a trial

[kajsdf]

12* , 4368 elevation

[eaglefreek]

Mine does the same thing. When it's warm outside and I stop to go into a store for a few minutes. I have to hold the throttle to the floor and it will sputter a bit before clearing up. I can smell fuel from about 10 feet away after turning my car off. I've pulled the air cleaner and have seen fuel percolating into the manifold when the engine is turned off. I was going to make a heat shield to put between the carb and manifold, but keep telling myself I'm going to do the EFI swap soon and not to worry about it. This will be my third summer dealing with it. I think I will have to do one or the other.

[carnuck]

See if the line going into the carb is loose. They can "swing" downwards from the weight of the fuel filter and raise the float level, flooding the car after shutdown.

[rohnk]

Sounds like a bit of a stretch, but what about vapor lock? Maybe try loosening the gas cap and see if it makes the soda can sound when you open it.

[kajsdf]

i took another look today, and it is the same problem eaglefreek has. i see fuel dripping in one one side, closest to the valve cover. it is the generic 1 in 1 out clear filter from napa - is the angle it sits at what is causing this? the problem is more prevalent on hot days so i am not certain i really understand what exactly is happening

[JayRamb]

My problem was my ICM. Replaced that and solved everything.

[eaglefreek]

i took another look today, and it is the same problem eaglefreek has. i see fuel dripping in one one side, closest to the valve cover. it is the generic 1 in 1 out clear filter from napa - is the angle it sits at what is causing this? the problem is more prevalent on hot days so i am not certain i really understand what exactly is happening

Hmm. I have the one outlet filter also. I wonder if that has something to do with it.

[kajsdf]

i switched to the oem screw in type and it seems to be starting better. ill drive around tomorrow to test it out.

[rohnk]

That makes sense, no place for the extra pressure to go once the engine is shut off. On the OEM type, the third plug for fuel return to the tank depressurizes the line between the pump and carb.

[Jurjen]

I had that problem with the 1 in 1 out filter too. After switching off the engine there is too much pressure inthe line causing the carb to flood.
Problem solved after I reinstalled the 3-way filter and hooked up the return line again.