Won't idle
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Posting Guru
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From: East Tn
Won't idle
I put a edelbrock intake and 650 carb on my f150 last year. It will not idle in gear. No matter how much I turn the idle screw up it wants to sputter and die once I put it in gear. Any ideas? 83 302 and c-6. No egr.
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From: Virginia
Have you adjusted the mixture screws?
Where do you have the vacuum advance for the distributor hooked up? If you are not sure where to hook it up, disconnect it and plug the line, and then adjust the carb and try it.
Where do you have the vacuum advance for the distributor hooked up? If you are not sure where to hook it up, disconnect it and plug the line, and then adjust the carb and try it.
Fleet Mechanic
Joined: Jul 2011
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For what it's worth, a 650 CFM 4bbl is a bit big for a 302. Even with a 600 CFM, the 302 can't use all of that air flow unless you have a motor that's built to turn 6000+ RPM. A 500 CFM carburetor is right in the "perfect" zone as far as size goes for a truck 302.
Like was stated, make sure your fuel mixtures are properly set, make sure there are no vacuum leaks, check your ignition timing, check your choke setting, check fuel flow, check everything you possibly can.
With a carburetor, you have to make sure everything is just right, or you'll never get optimal performance.
If you ask me, I think the problem is ignition timing. Don't you have to pull the distributor on a 302 to change the intake manifold? If the timing is too retarded, you'll have to turn the idle screw way up to get it to run, and it'll pull low vacuum.
Like was stated, make sure your fuel mixtures are properly set, make sure there are no vacuum leaks, check your ignition timing, check your choke setting, check fuel flow, check everything you possibly can.
With a carburetor, you have to make sure everything is just right, or you'll never get optimal performance.
If you ask me, I think the problem is ignition timing. Don't you have to pull the distributor on a 302 to change the intake manifold? If the timing is too retarded, you'll have to turn the idle screw way up to get it to run, and it'll pull low vacuum.
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Joined: Oct 2010
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From: Missouri
Have you checked the timing?
Is the cam stock?
Was the carb new or at least in usable condition?
Will it idle in gear with the choke engaged?
You do realize that Edelbrock carbs use less fuel pressure than a stock carb right?
Spark plug color?
Is the cam stock?
Was the carb new or at least in usable condition?
Will it idle in gear with the choke engaged?
You do realize that Edelbrock carbs use less fuel pressure than a stock carb right?
Spark plug color?
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Posting Guru
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From: East Tn
I bought everything new. Truck is 100% stock except carb and intake. Vacuume lines are installed per instructions. It's probably the timing. Do I need to turn the dizzy clockwise or counter clockwise. It runs great at speed. It is an economy 650 and I haven't touched the mixture screws.
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From: Virginia
You haven't set the timing or adjusted the mixture screws on a totally new setup? That's not good. Get a timing light first. Set the timing. It's not critical to set it to the factory settings since nothing is original, but it's nice to know where you are at and how much you have moved it. You should be in the 8 to 14 degree before top dead center area. I would start with 8 or 10, and then experiment from there.
These carbs are universal, and as such they need to be adjusted. They can be bolted to many different engines, and they need to be tweaked after they are installed. I am sure the instructions told you this.
Don't worry about it being too big, if it's a vacuum secondary it will adjust itself somewhat. You are not too far off as far as size, I run the 600's all the time on the 302's and they seem to like this carb. It actually seemed a little small on a hopped up 350 chevy I had, but for the 302 it worked well.
These carbs are universal, and as such they need to be adjusted. They can be bolted to many different engines, and they need to be tweaked after they are installed. I am sure the instructions told you this.
Don't worry about it being too big, if it's a vacuum secondary it will adjust itself somewhat. You are not too far off as far as size, I run the 600's all the time on the 302's and they seem to like this carb. It actually seemed a little small on a hopped up 350 chevy I had, but for the 302 it worked well.
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