About Holley's
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Lead Driver
Joined: Mar 2008
Posts: 7,192
Likes: 384
From: Near Los Angeles
About Holley's
I recently installed my first Holley, an 1848, 465 cfm vacuum secondary, with the hot air choke. I'm now learning the Holley.
It is on a pepped up 300 inline with the hp of a 360 with a 2v carb.
I am posting because of an issue that has me stumped. It starts and idles fine, but after driving a bit when I come to a light the idle drops lower and it starts to chug, as if it is going to stall. It has an auto trans. If I shift into N or P it runs smooth, but slower rpm than set. I should mention the carb was NOS, and had set on a shelf for untold years, with paper gaskets. I went through it and put in a kit.
I have had issues with header heat causing fuel boil/vapor lock and am getting ready to change header--which is right under the carb/intake--to efi manifolds. Does this sound like a heat issue? or possibly a foreign body in the idle circuit?
It is on a pepped up 300 inline with the hp of a 360 with a 2v carb.
I am posting because of an issue that has me stumped. It starts and idles fine, but after driving a bit when I come to a light the idle drops lower and it starts to chug, as if it is going to stall. It has an auto trans. If I shift into N or P it runs smooth, but slower rpm than set. I should mention the carb was NOS, and had set on a shelf for untold years, with paper gaskets. I went through it and put in a kit.
I have had issues with header heat causing fuel boil/vapor lock and am getting ready to change header--which is right under the carb/intake--to efi manifolds. Does this sound like a heat issue? or possibly a foreign body in the idle circuit?
Laughing Gas
Joined: Aug 2000
Posts: 1,008
Likes: 65
From: Eastern, Idaho
Hard to say. One thing I found that makes these things easy to figure out is a wide band air/fuel ratio meter. I got one from summit, wired it to a cig lighter plug and use it for diagnosis stuff. It requires installing a port in the exhaust for the o2 sensor. The benefit is knowing if it lean or rich and when instantly. Then you know what to fix.
I would look at float level and vacuum leaks. Holleys tend to have less problems with heat but thats on V8s. I suppose it could be heat related.
I would look at float level and vacuum leaks. Holleys tend to have less problems with heat but thats on V8s. I suppose it could be heat related.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 83
From: NorCal
I am no Holley aficionado but...
Autolites on automatic trans-equipped vehicles had a deceleration valve which prevented the carb from slamming shut when ya let off the pedal. I think that principle might be amiss on that Holley.
Autolites on automatic trans-equipped vehicles had a deceleration valve which prevented the carb from slamming shut when ya let off the pedal. I think that principle might be amiss on that Holley.
Thread Starter
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Lead Driver
Joined: Mar 2008
Posts: 7,192
Likes: 384
From: Near Los Angeles
HioSilver: Yeah, I remember that valve in front of the throttle linkage on the 4100's. You may be right about this Holley needing one.
Guys, the problem may be that I have an open vacuum port for the hot air choke. How should address that issue? Does anyone run a hot air or thermostatic choke? Thanks.
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