351w hesitates/bucks
Thread Starter
|
Senior User
Joined: Jan 2004
Posts: 114
Likes: 0
From: Phoenix, AZ
351w hesitates/bucks
Ok.. so, I've got an 86 351w, took off the stock carb, and put on a Holley 670 CFM Truck Avenger carb.. and it bucks real bad, esp. when a little cold, or for example, if I'm in 1st gear, just idling and rolling forward and try to stop it, it'll lurch forward, then pause till I let off the gas, then lurch forward a foot or so then idle forward again.. also, if moving slightly slow for 3rd/4th gear, and try to punch it, it bucks a lot until the RPMs are higher..
I've got the vaccuum ports hooked up right, except for the PCV Valve, I've got that unhooked, as I'm broke, and so is it. Although the port on the carb is plugged.
Any ideas on what the problem could be? Doesn't seem to be any mis fires, idles well, not rough or anything, timing should be good, it was set just recently.. any help would be greatly appreciated, 'cause I really need the low end power on this vehicle.
I've got the vaccuum ports hooked up right, except for the PCV Valve, I've got that unhooked, as I'm broke, and so is it. Although the port on the carb is plugged.
Any ideas on what the problem could be? Doesn't seem to be any mis fires, idles well, not rough or anything, timing should be good, it was set just recently.. any help would be greatly appreciated, 'cause I really need the low end power on this vehicle.
Elder User
Joined: Apr 2004
Posts: 544
Likes: 0
From: Ocala, Florida
If the rest of the engine is stock, you have a strong possibility that you over carbureted the engine. You might be dumping a puddle of fuel into the intake manifold. The Holley T/A 670 cfm carburetor is for engines between 300 to 400 horse power. I think you should get a 500 cfm 4bbl carburetor with vacuum secondaries. Or give Holley a call and talk to a technician.
Thread Starter
|
Senior User
Joined: Jan 2004
Posts: 114
Likes: 0
From: Phoenix, AZ
Ok, I redid the timing, and some carb tuning, got that problem fixed..
But I noticed that after I push the petal down as far as it can go, then go out and look at the carb, it's still got another inch or so that it could go.. and.. I can always use more..
Anyone know a good way to fix that?
It's an 81 F100.
But I noticed that after I push the petal down as far as it can go, then go out and look at the carb, it's still got another inch or so that it could go.. and.. I can always use more..
Anyone know a good way to fix that?
It's an 81 F100.
Thread
Thread Starter
Forum
Replies
Last Post
46Whizzer
1973 - 1979 F-100 & Larger F-Series Trucks
2
Jan 12, 2015 06:47 AM
robert196614
1987 - 1996 F150 & Larger F-Series Trucks
5
Jan 30, 2014 03:57 PM
PagodaMomar
1961 - 1966 F-100 & Larger F-Series Trucks
8
Jun 3, 2010 11:23 PM
tgore3
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
8
Jul 30, 2006 09:14 PM
nukeday
1967 - 1972 F-100 & Larger F-Series Trucks
1
Jun 18, 2006 12:39 AM
