Backfire under acceleration how do I fix it?
Elder User
Joined: Jun 2010
Posts: 677
Likes: 2
From: High Point NC
id say its more so in the timeing and may be a little rich on the idle side. regaurdless what ford/ FTE useres say its suposed to be, ive found that i have to run my 360 at 0-2 degrees btdc any before that and it won run and any after that it runs ok but experiances the same problems as described before.
i may be running it a lil early to compensate for another problem im haveing but it has loads of power and torqe and my mileage has improved insignifigantly. just my 2 cents
i may be running it a lil early to compensate for another problem im haveing but it has loads of power and torqe and my mileage has improved insignifigantly. just my 2 cents
Fleet Mechanic
Joined: Nov 2010
Posts: 1,501
Likes: 1
From: Axtell, TX
whatever you decide to do, don't put a 750cfm carb on a 360.
The formula for selecting carb size: VE(volumetric efficiency) X Cubic Inch X max rpms / 3456.
A 500cfm is just right for a 360. 600 is not too bad though.
The formula for selecting carb size: VE(volumetric efficiency) X Cubic Inch X max rpms / 3456.
A 500cfm is just right for a 360. 600 is not too bad though.
Thread Starter
|
Elder User
Joined: Feb 2010
Posts: 537
Likes: 0
I would like to keep the carb that's on it. I haven't been doing anything with this truck because it has a flat tire right now. I want to drive it this summer so I need to figure out this problem. I need to get a set of tires too.
Thread Starter
|
Elder User
Joined: Feb 2010
Posts: 537
Likes: 0
I am at the point where I think I will just drive the crap out of it this summer and when winter hits I will pull the engine and replace all the gaskets and seals as well as put a new timing chain kit on. I bet I have a leak in the intake manifold. It is seeping coolant out between the intake and head in one spot. Its a very tiny amount but that tells me its not 100% sealed. It is not enough to even drip. There is no oil in the coolant or coolant in the oil. I figure I will just suck it up and drive it as is for awhile. I only use it for off road driving anyway. I am not saying I wont drive it somewhere else but I cant afford the gas to just cruise around at 8mpg.
Senior User
Joined: Oct 2010
Posts: 277
Likes: 0
From: Oshkosh, Ne
so what size carb should one put on a 429? not sure what it came from or anything about it other than it has a 4bbl carter afb on it. and when i am driving and punch it you cant even feel the 4bbl kick in. it is not a vacuum setup its a linkage setup. maybe its just not big enough. i have not been able to figure out which carter it is.
New User
Joined: Mar 2011
Posts: 7
Likes: 0
back freing
hi my name is nathan i have an 86 ford i have an 85 motor in it i have replaced all most everthing but the carb when i give it alot of gas it backfires what do u think it could be could it be the coil going bad
Elder User
Joined: Feb 2008
Posts: 999
Likes: 1
From: Davison, Mi.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Thread
Thread Starter
Forum
Replies
Last Post
Brnfree
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
5
Apr 19, 2015 11:18 AM
jhweigel
1948 - 1956 F1, F100 & Larger F-Series Trucks
3
Jul 19, 2014 11:01 AM
pintoches
1978 - 1996 Big Bronco
14
Oct 27, 2012 07:29 AM
