but it may be a sticking choke linkage like is gummed up ... or a pull off not working.
High rpm
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5th Wheeling
Joined: Mar 2021
Posts: 42
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High rpm
Hi
My ´78 351W takes way to much rpms when I start and it doesn't help give a little throttle.
The wacuum system is working as it should, and I can't detect that it takes false air in the carburetor.
Does anyone have a good idea what it can be
Please write for further information if it's needed
BR
Christian
My ´78 351W takes way to much rpms when I start and it doesn't help give a little throttle.
The wacuum system is working as it should, and I can't detect that it takes false air in the carburetor.
Does anyone have a good idea what it can be
Please write for further information if it's needed
BR
Christian
Lead Driver
Joined: Jun 2006
Posts: 5,653
Likes: 978
From: Near Yosemite CA
I'm sorry dude... but I have no idea what you are asking or saying...
Unless swapped, your engine is a 351M, if it's rev'ving up after starting, you'll need to adjust your choke/fast idle
Unless swapped, your engine is a 351M, if it's rev'ving up after starting, you'll need to adjust your choke/fast idle
Hi
My ´78 351W takes way to much rpms when I start and it doesn't help give a little throttle.
The wacuum system is working as it should, and I can't detect that it takes false air in the carburetor.
Does anyone have a good idea what it can be
Please write for further information if it's needed
BR
Christian
My ´78 351W takes way to much rpms when I start and it doesn't help give a little throttle.
The wacuum system is working as it should, and I can't detect that it takes false air in the carburetor.
Does anyone have a good idea what it can be
Please write for further information if it's needed
BR
Christian
Cargo Master
Joined: Jul 2005
Posts: 2,309
Likes: 364
From: Kansas
I would remove the air cleaner and make sure there is no interference with the throttle linkage, make sure the choke is fully opening after the engine warms up, make sure the fast-idle cam on the choke is not bound up...if all those things are working, then either adjust the idle speed on the carb and/or choke (as previously mentioned) or keep looking for a vacuum leak.
Lead Driver
Joined: Jul 2017
Posts: 9,591
Likes: 1,171
From: San Jose, CA
Sounds like the choke to me as well.
If you can, please post up some pictures of your engine compartment. Especially, as mentioned, with your air cleaner, housing off.
when it’s running at high RPM, does it stay that way? Or does it eventually come down?
good luck.
If you can, please post up some pictures of your engine compartment. Especially, as mentioned, with your air cleaner, housing off.
when it’s running at high RPM, does it stay that way? Or does it eventually come down?
good luck.
Thread Starter
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5th Wheeling
Joined: Mar 2021
Posts: 42
Likes: 0
Hi
I got a Edelbrock 1406 with auto-choke, mounted last year and that is working just fine, connection with choke house is going smooht and nothing is stuck.
The choke is fully opening when it gets warm
I have replaced all the vacuum hoses.
It runs with high rpm and doesn't come down even when hot
I got a Edelbrock 1406 with auto-choke, mounted last year and that is working just fine, connection with choke house is going smooht and nothing is stuck.
The choke is fully opening when it gets warm
I have replaced all the vacuum hoses.
It runs with high rpm and doesn't come down even when hot
Lead Driver
Joined: Oct 2018
Posts: 7,864
Likes: 2,359
check for vacuum leaks.
make sure your advance is hooked to ported vacuum and your timing is set correctly. that will cause what you're talking about. so will other things.
make sure your advance is hooked to ported vacuum and your timing is set correctly. that will cause what you're talking about. so will other things.
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Joined: Feb 2004
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From: The Shenandoah Valley
Hi
I got a Edelbrock 1406 with auto-choke, mounted last year and that is working just fine, connection with choke house is going smooht and nothing is stuck.
The choke is fully opening when it gets warm
I have replaced all the vacuum hoses.
It runs with high rpm and doesn't come down even when hot
I got a Edelbrock 1406 with auto-choke, mounted last year and that is working just fine, connection with choke house is going smooht and nothing is stuck.
The choke is fully opening when it gets warm
I have replaced all the vacuum hoses.
It runs with high rpm and doesn't come down even when hot
You didn't leave any vacuum ports open by chance, like the big one in the back meant for PCV?
Mountain Pass
Joined: Aug 2024
Posts: 201
Likes: 84
From: Queensland Australia
If you have checked all the previous suggestions and believe there is still a vacuum leak, fill a plastic spray bottle with adjustable spray mist tip, with water, (available most $ shops) and with the engine running, spray around the edges of the intake manifold, base of carburettor, if the engine then reduces revs at a particular point you've found your vacuum leak, possibly a bad intake manifold gasket, carb base gasket, or even a worn carb butterfly shaft.
Check all vacuum hoses the same way, also look at the brake booster and vacuum line, a booster diaphragm leak can also cause a vacuum leak.
Check all vacuum hoses the same way, also look at the brake booster and vacuum line, a booster diaphragm leak can also cause a vacuum leak.
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