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Old 05-11-2012, 03:22 PM
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Hard Starting when warm

Hey all. 75 Monte Carlo, 400sbc, mild cam, aluminum heads, right now about 16* of timing at idle. Full time vac advance. Mechanical fuel pump. My question is about starts. When cold, she starts up pretty decent, but then dies right away. Even with some gas, she usually bogs and dies. I have a manual chock hooked up, but don't use it. Second start, she'll be fine and idle up to normal temps no problem.

However, if I have to turn her off and restart she struggled while restarting. It takes a while and needs a lot of gas. I understand that with a large cam and very advanced timing, that it's recommended to install a cut off switch to the dizzy to cut power to it while cranking or something a long that line. However, I didn't think with as little of timing that I have that I would need to do that.

I'm seeing race cars start at the turn of the key, cold and warm. What's going on here? Right now, it's idling perfect and running almost top notch. It's just the starts I'm not happy with. Any advice from you pros out there? Thanks!

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Old 05-11-2012, 03:31 PM
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Does it buck the starter and barely turn over or does it turn over no problem when hot?
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Old 05-11-2012, 03:33 PM
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Quote:
Originally Posted by Custom10
Does it buck the starter and barely turn over or does it turn over no problem when hot?
There is no bucking. Just rotates over and over. Give it gas, same thing. Eventually she'll fire up. But it doesn't struggle
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Old 05-11-2012, 03:36 PM
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Have you tried more advance say 20 BTDC? also what carb and fuel pressure?
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Old 05-11-2012, 03:58 PM
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Quote:
Originally Posted by Custom10
Have you tried more advance say 20 BTDC? also what carb and fuel pressure?
Did originally have it over 20 without vac when I was having idling issues. Turned out the torque converter I had was too small for the cam, so it was stripping away my power. Upgraded the converter, and was able to lower timing and have a much better idle, cruise, and timing. Since then, has been under 20.

Carb is an Edlebrock, although not sure on what jets. Car was torn to pieces when bought and never found out what model it was. Was on the car before the tear down supposedly.

Fuel pressure I don't have a gauge, but should be I believe 5-10psi IIRC. Was the Summit brand
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Old 05-11-2012, 05:06 PM
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5 psi is lots for the eddy carb, best to have a regulated supply for 5 psi WOT or idle.

You can take the idle mix screws out and blow some compressed air through the passages.

On my performer carb if I let the thing sit for more than few days it is hard starting when cold. Need to crank it over way more than I would like before it fires up, once it is going then no issues. Had a holley on there before and it could sit for a week or two and fire right up with a couple pumps.

What vacuum does the motor pull at idle?
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Old 05-12-2012, 03:44 PM
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Get a heat isolation gasket or spacer for the edelbrock carb and block the intake manifold heat riser passages to reduce carb body heat.
Shield the fuel lines or relocated away from heat.
Edelbrock carbs tend to run hot. Cooler is better.

Edelbrock carb fuel pressure 5psi max at idle.
more is not better.

The pump gas in your local area may have not changed over from Winter gas formula
to the summer gas . Winter gas designed for easy cold weather starts tends to vapourize way too easily in the spring.
Warm weather hot start up drivability issues.
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Old 05-13-2012, 05:41 PM
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Quote:
Originally Posted by F-BIRD'88
Get a heat isolation gasket or spacer for the edelbrock carb and block the intake manifold heat riser passages to reduce carb body heat.
Shield the fuel lines or relocated away from heat.
Edelbrock carbs tend to run hot. Cooler is better.

Edelbrock carb fuel pressure 5psi max at idle.
more is not better.

The pump gas in your local area may have not changed over from Winter gas formula
to the summer gas . Winter gas designed for easy cold weather starts tends to vapourize way too easily in the spring.
Warm weather hot start up drivability issues.
I actually just installed a spacer this year, and continues to have the same issue. Fuel lines are pushed pretty much as far as way from heat as possible. Made sure to run them to the front and not by the headers.

I'll buy a gauge for the fuel so I can see what she's actually running at.

I will blow some air through the screws next time at the garage.

Vac at idle was around 14 or so I believe.
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Old 05-13-2012, 05:50 PM
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Quote:
Originally Posted by david-b
I actually just installed a spacer this year, and continues to have the same issue. Fuel lines are pushed pretty much as far as way from heat as possible. Made sure to run them to the front and not by the headers.

I'll buy a gauge for the fuel so I can see what she's actually running at.

I will blow some air through the screws next time at the garage.

Vac at idle was around 14 or so I believe.
i always use a 1/2 inch diameter heat sleeve on my fuel line from the pump to the carb. don't know if it really makes a difference but it might be something for you to think about.
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