Idle speed question
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Senior User
Joined: Nov 2010
Posts: 146
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From: Air Capitol, KS
Idle speed question
Okay folks, here's my latest wrinkle. I have my idle screws set close to where I want them. The thing idles great whether I set the choke and high idle or start at low idle. Everything's normal until I drive it around for a while (especially around 40 mph or faster) then come to a stop, and the idle is about 400 or so rpm higher. When at this higher idle speed, the engine seems a little off at idle, kinda reminds me of a racing heartbeat. I have to shut the truck off to reset the idle speed back to the normal low idle. Any ideas? Electric choke/high idle is not an issue because I have a manual choke conversion.
Senior User
Joined: Aug 2008
Posts: 109
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From: Butler PA
I have the same problem with my idle. I found my screws were stripped so I need a new carb anyway. I replaced my carb and now my question is what should the high ilde and low idle be set at. The carb has eletrice choke. If you guys know let me know please thanx. I didnt mean to high jake the thred sorry. O the truck has a 300 straight six under the hood.
Senior User
Joined: Dec 2010
Posts: 184
Likes: 1
From: Strasburg, Va.
I have the same problem with my idle. I found my screws were stripped so I need a new carb anyway. I replaced my carb and now my question is what should the high ilde and low idle be set at. The carb has eletrice choke. If you guys know let me know please thanx. I didnt mean to high jake the thred sorry. O the truck has a 300 straight six under the hood.
Post Fiend
Joined: Nov 2005
Posts: 7,437
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From: Charles Town, W bygod Va
Okay folks, here's my latest wrinkle. I have my idle screws set close to where I want them. The thing idles great whether I set the choke and high idle or start at low idle. Everything's normal until I drive it around for a while (especially around 40 mph or faster) then come to a stop, and the idle is about 400 or so rpm higher. When at this higher idle speed, the engine seems a little off at idle, kinda reminds me of a racing heartbeat. I have to shut the truck off to reset the idle speed back to the normal low idle. Any ideas? Electric choke/high idle is not an issue because I have a manual choke conversion.
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Joined: Jan 2001
Posts: 56,997
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From: Virginia
Okay folks, here's my latest wrinkle. I have my idle screws set close to where I want them. The thing idles great whether I set the choke and high idle or start at low idle. Everything's normal until I drive it around for a while (especially around 40 mph or faster) then come to a stop, and the idle is about 400 or so rpm higher. When at this higher idle speed, the engine seems a little off at idle, kinda reminds me of a racing heartbeat. I have to shut the truck off to reset the idle speed back to the normal low idle. Any ideas? Electric choke/high idle is not an issue because I have a manual choke conversion.
Senior User
Joined: Aug 2008
Posts: 109
Likes: 0
From: Butler PA
O yeah sorry I have a 1980 f150 with a 300 six like I said I would like to know what the high and low speed idle should be set at. thanx again
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From: Virginia
...........should be on the radiator support sticker.
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Thread Starter
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Senior User
Joined: Nov 2010
Posts: 146
Likes: 0
From: Air Capitol, KS
Thanks Franklin2, and glovemeister. That could explain why my high idle has been harder to activate lately with my choke ****. I'll check that out.
