Edelbrock 4 Barrell 600CFM
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Edelbrock 4 Barrell 600CFM
Im having some very concerning issues pertaining to the carb. I live in CO and my truck absolutely hates the cold. Once its runnin its fine but it takes a crap load to get it started. I think its a fuel issue but i dont have/find a diagram for the carb to try and adjust it. I inherited the truck from my uncle and he used it for a work horse (as it should) and he passed away so I dont know what all has really been done to the carb. Any suggestions or advice is welcomed. Thankyou and have a great Sunday.
SemperFidelis.
SemperFidelis.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,252
Likes: 113
From: Mandan, ND
Electric choke? Is it getting power? How is it set?
In modern age of EFI, we forget that changing weather (temp, humidity, pressure) impact a carbs operation. A setting that may work in one season does not in another.
That said, a bit of carb tuning across seasons, will get it to a point where it “does all the things, all the time”.
Examine your carb for a part number, then go here https://www.edelbrock.com/edelbrock-...esource-center to look up the instructions for your carb. These Edelbrock carbs are very good, and when tuned perform nicely.
In modern age of EFI, we forget that changing weather (temp, humidity, pressure) impact a carbs operation. A setting that may work in one season does not in another.
That said, a bit of carb tuning across seasons, will get it to a point where it “does all the things, all the time”.
Examine your carb for a part number, then go here https://www.edelbrock.com/edelbrock-...esource-center to look up the instructions for your carb. These Edelbrock carbs are very good, and when tuned perform nicely.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Welcome to FTE
What elevation do you live at? A quick glance at a spark plug or two will give you a window into how the engine is running. Post a sharp and clear close up picture of a plug or two. Modern gasoline should burn very clean with hardly any "color" on the porcelain.
Make sure ignition system is providing a good hot fat spark. The old saying went "90% of carburetor problems are ignition related" and that's probably true. Still, high altitude causes tuning issues because flatlander parts, specs and adjustments won't work up high. Different carb makes have different ways of going about it, but one area of your focus should be the power or acceleration circuit.
These always use the engine manifold vacuum as a signal to provide more fuel on demand based on engine load. Regardless of altitude, the power circuit must never be employed when the engine is in a steady no load cruise condition or it will run like crap and foul plugs. A mechanic's vacuum gauge is your friend here in engine/carb diagnostics and tuning.
What elevation do you live at? A quick glance at a spark plug or two will give you a window into how the engine is running. Post a sharp and clear close up picture of a plug or two. Modern gasoline should burn very clean with hardly any "color" on the porcelain.
Make sure ignition system is providing a good hot fat spark. The old saying went "90% of carburetor problems are ignition related" and that's probably true. Still, high altitude causes tuning issues because flatlander parts, specs and adjustments won't work up high. Different carb makes have different ways of going about it, but one area of your focus should be the power or acceleration circuit.
These always use the engine manifold vacuum as a signal to provide more fuel on demand based on engine load. Regardless of altitude, the power circuit must never be employed when the engine is in a steady no load cruise condition or it will run like crap and foul plugs. A mechanic's vacuum gauge is your friend here in engine/carb diagnostics and tuning.
Mountain Pass
Joined: May 2019
Posts: 150
Likes: 12
From: Central CA
Factory intake? Still have a heater spacer under the carb? I don’t have the latter and replaced my intake with a Performer RPM that doesn’t have the exhaust crossover. Consequently my truck does not like to run in the cold until it’s good and warm under the hood (10 or so minutes of driving). It’ll sputter and stumble like crazy until it warms up, and it doesn’t even get that cold where I am (mid 30s in the early morning).
Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
If it really runs fine when it's warm, then it Sounds like the choke needs to be checked out. Possibly adjust the calibration, but if your uncle had it set, then it's still set. That's the great thing about edelbrock carbs. They hold their setting better than any other carb.
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