351 holley carb help!
Thread Starter
|
Freshman User
Joined: Jul 2007
Posts: 43
Likes: 0
351 holley carb help!
600 cfm 4160 holley carb with edelbrock performer intake i JUST put on the truck(351m) smell fuel runnin rich, HORRID gas mileage(MUCH worse then it should be, vaccume secondaries) like seriouslly a ride around the block about 1 mile burned almost a quater tank... im goin to have the carb tuned better tomarow at my shop but i was just wonderin is this the main thing that could be wrong with it? runs rough at idle tends t o load up fuel dont see ANY drippin from squirters. could it jsut be possible that im ONLY runnin too rich? i mean the truck ran OKAY with my SHOT holley 2 bbl on it before?
Thread Starter
|
Freshman User
Joined: Jul 2007
Posts: 43
Likes: 0
edited post i also forgot to add that a friend DID try to tune it an it ran slightly better but the idal RPMS are VERY eratic! rough idal strong fuel odor the truck diesiled when i shut it off jsut now(rarely ever does that) did get a backfire out of the exhaust... WAS backfirein a little while runnin untill my friend attempted to tune it by ear, do you guys think this is solely a carb tuning issue?
Elder User
Joined: Nov 2003
Posts: 778
Likes: 2
From: southeast Idaho
Sounds to me like its dumping fuel down the center, probably from a bad power valve, or gasket maybe. A backfire can blow the power valve if its in the intake. Thats the most likely if its not dumping it down the venturi's..
Thread Starter
|
Freshman User
Joined: Jul 2007
Posts: 43
Likes: 0
i thought since the early 90s holley has been makein there carbs with "unblowable powervalve systems"? aka i thin kround 92 or so holley carb power valves cannot EASILY be blown? i know i had no bad backfires out the carb... i only had ONE but it wasnt bad and havent had one since i had the carb slightly tuned?
Thread Starter
|
Freshman User
Joined: Jul 2007
Posts: 43
Likes: 0
**** BIG PROBLUM I DISCOVERED... while checkin everythin out turns out the fuel line that connects to the outgoin on my fuel pump(the line that goes to the carb) is LEAKIN BADLY... just shut off its a steady drip under drivein conditions it must be a steady drip/flow. the leak is at the little piiece that screws into the pump but not the pump itself so hopefully i only need to replace the line. would this be the answer to all my symptoms possibly?
Trending Topics
Lead Driver
Joined: Mar 2004
Posts: 8,922
Likes: 153
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
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
Elder User
Joined: Sep 2003
Posts: 576
Likes: 0
**** BIG PROBLUM I DISCOVERED... while checkin everythin out turns out the fuel line that connects to the outgoin on my fuel pump(the line that goes to the carb) is LEAKIN BADLY... just shut off its a steady drip under drivein conditions it must be a steady drip/flow. the leak is at the little piiece that screws into the pump but not the pump itself so hopefully i only need to replace the line. would this be the answer to all my symptoms possibly?
where'd you get the carb btw, was it used, or did you get it brand new? Brand new they're usually set pretty well, but if it's used who knows how someone else tuned it?
Btw, i never had a problem with power valves blowing on my holley, when i was getting my engine running i must of had that thing backfire up through the carb 50 times, never damaged the valve.
Thread Starter
|
Freshman User
Joined: Jul 2007
Posts: 43
Likes: 0
yea the carb was new never touched fuel but it had been sittin for a while in a garage. the secondaries float was stuck and dribblin fuel down noticed that when i looked into the rear barrels and saw it pourin adjusted the front float to be safe ahad a friend adjust carb by ear till i can use the vaccum gauge at my shop to adjust it right. turns out the choppy idles related to cylinder 4 and 5 not fireing? cant figure out why it has compression fuel and spark even swapped wire and plug still didnt fire in 4 and 5 and cant figure out why. gonna do an ACTUAL compression test in those cylinders tomarow. had NO problums before i put the new manifold and carb in. now its doin this? any ideas any one? my exhaust is also goin *pop* *pop* *pop* *pop* *pop* *pop* while its idaling and im assumeing thats the unburned fumes goin into those cyls hittin popin in the exhaust. truck runs smoothe at high rpms tho and i cant figure out wth is goin on with that? any ideas?
Thread
Thread Starter
Forum
Replies
Last Post
brian eiland
1987 - 1996 F150 & Larger F-Series Trucks
43
Mar 3, 2016 07:06 PM
TheSterling
1973 - 1979 F-100 & Larger F-Series Trucks
6
Feb 16, 2016 04:13 PM
love2fixit
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
31
Apr 30, 2015 09:10 AM
chillman88
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
11
Apr 28, 2015 04:37 AM
