different sort of hot start problem.
Thread Starter
Safety Car
Joined: Apr 2007
Posts: 4,435
Likes: 9
From: Kalamazoo Mi
different sort of hot start problem.
well i see a lot of guys who's starter motors heat soak. My car requires a god awful amount of cranking to start when its hot (or even after it is cool, but was hot). The starter motor cranks just fine, it just takes a lot of time to start.
I figure this is a problem with the gas evaporating out of the bowls. Am i right? it is most notable only after the engine has been run for a long time, and then shut down. Not for quick drives. Will those insulating carb gaskets help at all?
Also i dont know if it is related, but the car stalls under heavy breaking. I have had about 20 different pieces of advice by different people on this problem. I have already checked for vacuum leaks, there are none.
Steve
I figure this is a problem with the gas evaporating out of the bowls. Am i right? it is most notable only after the engine has been run for a long time, and then shut down. Not for quick drives. Will those insulating carb gaskets help at all?
Also i dont know if it is related, but the car stalls under heavy breaking. I have had about 20 different pieces of advice by different people on this problem. I have already checked for vacuum leaks, there are none.
Steve
Racer
Joined: Nov 2009
Posts: 332
Likes: 1
From: Watkins Glen New York
The brake stalling is a tough one, but as far as the starting goes - prime it (carefully) when it's hot and reluctant to start. If it starts right up, you at least have a direction to head in.
I'd look at the float level (S) too.
I'd look at the float level (S) too.
Thread Starter
Safety Car
Joined: Apr 2007
Posts: 4,435
Likes: 9
From: Kalamazoo Mi
i am thinking it all may be related to the floats, im going to check it out this weekend. Any other suggestions?
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
If you would have said yes to the pertronix I would have cautioned you on some of their units when starting you need to pause the key in the on position for a second or two before turning further to the start position otherwise the engine cranks several seconds longer before firing up.
Have you determined you do have spark while cranking , as the above post says prime and try starting. If it starts its not getting fuel.
When it does finally fire up does the it smoke ?
Floats too high could cause flooding on a hot engine and stalling on braking.
Have you determined you do have spark while cranking , as the above post says prime and try starting. If it starts its not getting fuel.
When it does finally fire up does the it smoke ?
Floats too high could cause flooding on a hot engine and stalling on braking.
Thread Starter
Safety Car
Joined: Apr 2007
Posts: 4,435
Likes: 9
From: Kalamazoo Mi
If you would have said yes to the pertronix I would have cautioned you on some of their units when starting you need to pause the key in the on position for a second or two before turning further to the start position otherwise the engine cranks several seconds longer before firing up.
Have you determined you do have spark while cranking , as the above post says prime and try starting. If it starts its not getting fuel.
When it does finally fire up does the it smoke ?
Floats too high could cause flooding on a hot engine and stalling on braking.
Have you determined you do have spark while cranking , as the above post says prime and try starting. If it starts its not getting fuel.
When it does finally fire up does the it smoke ?
Floats too high could cause flooding on a hot engine and stalling on braking.
ya i have spark when cranking. no smoke when it does fire up, i will try priming the heck out of it first.
Burning Brakes
Joined: Mar 1999
Posts: 1,047
Likes: 3
From: CA
All great ideas above. Some additional ideas...
It may be flooding when you turn it off hot. I'm far from a carb expert, but maybe if boiling over, or maybe dripping well plugs, or maybe a high float level. It would be interesting to see of pumping gas will help (as mentioned in a prior post) or holding foot to floor will help starting when hot. If starting is helped by holding foot to floor its most likely flooding.
As another diagnostic tool, when its not starting look down the carb to see if any gas is entering the carb when you pump the gas. If fuel is not squirting out it could be a few different things. While its pretty remote you could also have vapor lock.
And lastly, be sure your choke is open with you're trying to restart hot. Stanger things have happened. Worth a look.
My guess is its the float.
It may be flooding when you turn it off hot. I'm far from a carb expert, but maybe if boiling over, or maybe dripping well plugs, or maybe a high float level. It would be interesting to see of pumping gas will help (as mentioned in a prior post) or holding foot to floor will help starting when hot. If starting is helped by holding foot to floor its most likely flooding.
As another diagnostic tool, when its not starting look down the carb to see if any gas is entering the carb when you pump the gas. If fuel is not squirting out it could be a few different things. While its pretty remote you could also have vapor lock.
And lastly, be sure your choke is open with you're trying to restart hot. Stanger things have happened. Worth a look.
My guess is its the float.
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Melting Slicks
Joined: Oct 2002
Posts: 2,317
Likes: 111
From: St Louis MO
My first guess would be the choke closes too quickly after shutdown causing excessive richness during the hot or warm re-start. Pull the air cleaner the next time you do a hot restart and see if the choke is closed - if it is, manually open it (or have someone hold the choke linkage open); don't press (cycle) the pedal, which would squirt more fuel, but simply hold it down about 1/4 inch, and then crank to see if it starts.
