cold idle speed

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Apr 23, 2015 | 06:19 PM

fordguy98

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Tuned

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From: Texas

cold idle speed

OK so I'm having trouble with the idle speed on my 79 f150 with a 460. when i first start the engine when its cold and let off of the gas pedal it dies out but if i keep my foot on the pedal just a little bit it'll stay running then when it warms up i can let off of the pedal and it will idle just fine. what could my problem be??????? i read somewhere that it could be a bad accelerator pump. if it helps any I'm running a holley 4180 4bbl carb.

Apr 23, 2015 | 08:10 PM

notthemaniusedtobe

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From: San Diego

Sounds suspiciously like a faulty choke if it's only happening while it's cold....

Apr 23, 2015 | 08:43 PM

swall

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Joined: Jan 2001

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From: Snohomish

x2 or just a slight adjustment is needed.

Apr 23, 2015 | 09:38 PM

Blue and White

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Mine will do the same thing (400) if I peddle it. What I do instead is pump once before starting to set choke/fast idle and give it a shot of fuel. Then start it without touching the gas. Usually works. Let it run on fast idle for a minute or so then use the peddle.

Apr 24, 2015 | 12:10 AM

AK FORD GUY

Cargo Master

Joined: May 2009

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From: Eagle River, AK

Defiantly sounds like a choke / high idle issue.

I wish I could get mine figured out, it always requires two pumps to start.

Apr 24, 2015 | 10:48 AM

fordguy98

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Tuned

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From: Texas

whens cold it wont idle {and i do think that my electric choke might be sticking a little bit open} the when it warms up it idles just a little bit fast for my taste. like if i take my foot off of the gas when I'm out driving it'll run about 10 mph just by the idle speed but if i slow the idle speed down then it dont run quite right

could this be a carb related problem

Apr 24, 2015 | 10:52 AM

fordguy98

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Tuned

Joined: Mar 2015

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From: Texas

oh i do have to pump my pedal to get to start up when its cold

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Apr 26, 2015 | 03:57 PM

Ozzie H.

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Joined: Nov 2013

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From: S.E. Louisiana;so far USA

Here's another vote for the choke. That 4180 has a fast idle cam which should hold the throttle a bit more open when the engine is cold if it's working correctly. An adjustment may be needed.

Apr 26, 2015 | 04:49 PM

#10

BenOakley

Freshman User

Joined: Apr 2015

Posts: 25

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From: Cleveland

I have an edelbrock 1405, similar issue. What would be the best way to adjust or determine if you're doing it right? I'm no expert with these, and it was put on by a previous owner who lived in California. Picture for reference...

Apr 26, 2015 | 05:23 PM

#11

fordguy98

Thread Starter

Tuned

Joined: Mar 2015

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From: Texas

Quote:

Originally Posted by Ozzie H.

Here's another vote for the choke. That 4180 has a fast idle cam which should hold the throttle a bit more open when the engine is cold if it's working correctly. An adjustment may be needed.

how do i adjust the fast idle cam?