What does this mean?
Thread Starter
Race Director
Joined: Mar 2001
Posts: 11,601
Likes: 0
From: San Francisco CA
St. Jude Donor '07
What does this mean?
I've been having some problems lately with my '75 L48, Th400. It's running a little rough, but i'm trying to get my things together for a tuneup. Meanwhile, it's having trouble in the morning when I first start up.
Correct me if I'm wrong, but does the engine stay on the choke until it warms up? And once it does warm up, it goes into normal function?
Assuming that's correct, right after my car hits normal running temp it dies. If i drive around for a while longer, it seems fine. But when it just comes off the choke, it won't stay running whether I'm on the streat and in gear or in park sitting on my driveway waiting for it to warmup. I end up using the gas to keep it running and have to shift into neutral or park.
So, for all you car gurus, what does this mean? :confused:
Correct me if I'm wrong, but does the engine stay on the choke until it warms up? And once it does warm up, it goes into normal function?
Assuming that's correct, right after my car hits normal running temp it dies. If i drive around for a while longer, it seems fine. But when it just comes off the choke, it won't stay running whether I'm on the streat and in gear or in park sitting on my driveway waiting for it to warmup. I end up using the gas to keep it running and have to shift into neutral or park.
So, for all you car gurus, what does this mean? :confused:
Melting Slicks
Joined: Mar 2000
Posts: 2,975
Likes: 1
From: Northwest Iowa
Re: What does this mean? (Buffalo Dude)
Sorry, I will probably be not much help. but is the idle set too low or is it out of tune.
When I set the timing on my 75 ( 12 degrees btdc), it was idling around 1000 rpm and I couldn't get it to come down anymore, but before that would hardly run at idle.
This post will bring it back to the top. Maybe that will get some attention.
Good luck
When I set the timing on my 75 ( 12 degrees btdc), it was idling around 1000 rpm and I couldn't get it to come down anymore, but before that would hardly run at idle.
This post will bring it back to the top. Maybe that will get some attention.
Good luck
Race Director
Joined: Jun 2001
Posts: 16,483
Likes: 1
From: The Only Corvette in Gila Bend, Az.
St. Jude Donor '09
Re: What does this mean? (Buffalo Dude)
It should stay at high idle until you blip the throttle. This will release the choke when it is warmed up.
But you can get the choke to release to early remember you are just warming up the carb, not the entire engine, when you blip it to soon.
Then the engine will be almost flooded when the choke releases from this blip, and not run to smooth.
( I THINK )
You might try driving it slowly before it will release the choke, this will help to warm up the whole engine. If done correctly you will not notice when the choke kicks off, because you will be on the throttle ( lightly ) when it does
But you can get the choke to release to early remember you are just warming up the carb, not the entire engine, when you blip it to soon.
Then the engine will be almost flooded when the choke releases from this blip, and not run to smooth.
( I THINK )
You might try driving it slowly before it will release the choke, this will help to warm up the whole engine. If done correctly you will not notice when the choke kicks off, because you will be on the throttle ( lightly ) when it does
Le Mans Master
Joined: Sep 2000
Posts: 5,635
Likes: 4
From: Orlando Floriduh
Re: What does this mean? (Buffalo Dude)
Let's look at the basics: First there is the regular idle speed screw on the drivers side that must be set when the choke is WIDE open. Next there is a fast idle screw on the other side of the carb that needs to be set when the choke is on and the engine is cold. This screw rests on a stepped cam so it will keep the choke and the idle speed co-ordinated. The cam must be loose and free. Third thing is the coke thermostat. Over the years the coil gets "tired" and won't work correctly. If you set it to come on when you need it, it may not go off at the right time and vise versa. A new choke thermostat will really improve you chances of getting the system working right.
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[Modified by silvervetteman, 4:52 AM 12/13/2001]
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[Modified by silvervetteman, 4:52 AM 12/13/2001]
