4-Barrel Problems
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New User
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From: Eastern Kentucky
4-Barrel Problems
I have an '85 Ford F-150 4WD truck with 5.0 from an '84 Mustang GT under the hood with a Holley 4-barrel. I'm not sure what the problem is but after it runs for a minute or two, you can put it into drive and get ready to pull out when it pops back through the carb, it don't do it if you let it run for 5 or 10 minutes first. But if you do that, the longer it runs the faster it wants to run. You can kick it down to slow it down to a idle but then it wants to speed up again after a minute or two. I have been thinking about switching to an Edelbrock carb., I have heard that they're much better. Any Ideas?
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response to carb problem
Your problems are common to the holley carbs. i have seen this problem many times. I am fairly sure that this is caused by the rupture of your "power" valve. The increasing rpms when idling idicates a "creeping" flooding condition caused by the float. You are absolutely on the right track in thinking about replacing it with an edelbrock. Replacement put a stop to constant problems with a holley and bring you the assurance of a trouble free carburation system that holley cannot provide. Good luck
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From: Eastern Kentucky
Which 4-barrel Edelbrock would be the best for my application, now remember that I have an '85 Ford F-150 4WD truck with 5.0 from an '84 Mustang GT under the hood along with 33X12.50X15 tires on it to.
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From: midwest
the only reason you guys like the edelbrock is due to your lack of knowledge on carbs like the holley. i bought an edelbrock and hated it after a year. it has some problems the make it horrible and you cant fix it cause they have no fine adjustments like a holley. it you like the edelbrock its because you havent experienced a well tuned holley. just dont mess with your equivelent at the red light, if they have a holley you'll be left behind and wishing you did.
sorry to sound cocky but i speak the truth from experience....
sorry to sound cocky but i speak the truth from experience....
Cargo Master
Joined: Dec 2004
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From: NE Texas
I have to agree with smoke n tires. Additionally, a blown power valve will richen the carb, not lean it. A lean condition is what causes it to pop like was originally described. If the problem goes away when it's warmed up, that is more evidence that the problem is due to a lean condition, and is likely choke related. Retarded timing can also cause the desribed problem.
There are many EXCELLENT books on carburetion in general and Holleys in particular. If you will read one of these books, carburetion will no longer be a mystery.
Good luck,
Doc
There are many EXCELLENT books on carburetion in general and Holleys in particular. If you will read one of these books, carburetion will no longer be a mystery.
Good luck,
Doc
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From: Louisville,Ky.
Originally Posted by smoke n tires
the only reason you guys like the edelbrock is due to your lack of knowledge on carbs like the holley. i bought an edelbrock and hated it after a year. it has some problems the make it horrible and you cant fix it cause they have no fine adjustments like a holley. it you like the edelbrock its because you havent experienced a well tuned holley. just dont mess with your equivelent at the red light, if they have a holley you'll be left behind and wishing you did.
sorry to sound cocky but i speak the truth from experience....
sorry to sound cocky but i speak the truth from experience....
While a Holley will give you a little more maximum hp, the AFB (Edelbrock) design is more forgiving and will give better low end torque and throttle responce.
For the 84 302, I would use a 500cfm Edelbrock, especially with those tall tires.
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From: Eastern Kentucky
The 84 302, I bought this motor, ran it about a month or so when it quit. To make a long story short, the shaft that turns the oil pump had stripped and we didn't know it at the time so I had it overhauled from the bottom up. Now I've got a new motor that's hardly been used, what I mean is I only drive it back and forth to work, (and that's only 1/2 mile up the road and back everyday), to church, and ocasionally to town and back, (about 60 miles round trip). And sure it sounds great and I like to show off every now and then, but if you had a Mustang motor under your hood, Wouldn't You? I just want what's best for my truck and motor and right now I'm really dissatisfied with the Holley, maybe it needs a tune up, I don't really know! I want something that'll give me plenty of low-end torque and plenty of power. A friend told me to take the Holly off andd get Edelbrock, he said all of my problems would be taken care of. Again, I don't really know and I want what's best for me and my motor. Is the 500 cfm a better choice over the 600 or the 650, and why?
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Elder User
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From: midwest
the 302 came with a 600 stock and if the motor is mostly stock i would use a 600 holley. the aftermarket holleys are a ton better then the stock ones. id fine one for $30-$40 and put a $25 kit in it, then adjust it from there, but if your not interested in tuning the carb for max performance then get the edelcrap. i know their big selling point is bolt on and go, but do you really think the carb is a bolt on and go for any engine? no, its better for some then others, i think they give you 85-90% of what the engine is capable of out of the box, tuning is almost always necessary.
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From: Eastern Kentucky
The only difference in the re-build is I had a choice of cams to go with when I bought the complete overhaul kit. One was a torque cam, (that's the one I went with), and the other I think was something to do with the top end. It don't really backfires, it just sort coughs back through the carb until it gets warm. You can leave it netrual and rev the fire out of it, but when you pull it down into drive sometimes it'll go and sometimes it'll pop or cough back through the carb. After it gets warm it won't do it any more. I'm going to get someone to look at it first before spending more money for another carb. I would still like to the differences in the cfm's between a 500 or a 600, and which one is better for my application. I don't do any towing right now, but I plan to every now and then.
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From: Louisville,Ky.
The carb is probably a little lean for a larger cam (even a small one). They are set-up for emissions and with the engine breathing better, it is probably a bit lean on fuel, which will show up more when cold.
You may be able to raise the timing one or two degrees to help as long as it doesn't detonate when hot.
A mainly stock 302 will only use 480cfm @ 5500rpm so either will work, I'd use the 500cfm myself.
It's funny how the ground pounding Mopars in the mucle car years almost all used AFB carbs. Even the elephant 426Hemi used 2 of them. The 6-pack cars did use 3 2bbl Holleys though. My 69 Road Runner had the 440 6bbl engine that came with a 350cfm center carb with (2) 500cfm outboard carbs. SWEEEET!!!! Actually got 14mpg with 3.91 gears and a 4-speed when you didn't opem the outboard carbs.
You may be able to raise the timing one or two degrees to help as long as it doesn't detonate when hot.
A mainly stock 302 will only use 480cfm @ 5500rpm so either will work, I'd use the 500cfm myself.
It's funny how the ground pounding Mopars in the mucle car years almost all used AFB carbs. Even the elephant 426Hemi used 2 of them. The 6-pack cars did use 3 2bbl Holleys though. My 69 Road Runner had the 440 6bbl engine that came with a 350cfm center carb with (2) 500cfm outboard carbs. SWEEEET!!!! Actually got 14mpg with 3.91 gears and a 4-speed when you didn't opem the outboard carbs.
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From: Tulsa Oklahoma
If you do go with the edelbrock and you use your truck off road you will need the spring loaded needles. I had flooding problems off road until I installed them. Other than that I have had no problems with my edelbrock carb.