Running Issues
Thread Starter
|
Cross-Country
Joined: Mar 2016
Posts: 94
Likes: 0
Running Issues
I have a 1976 highboy with a 360 in it and it runs really rich but I have tried adjusting the carburetor and if I go on the lean side it doesnt want to start. Also I have heard some pinging at the higher rpms, I was told this could be detonation occurring and would like to know how to fix this myself, because I dont really have the funds and would like to learn. The carburetor is a demon 4bbl 625cm. I also have the msd coil and mallory ignition. spark plugs and wires were new maybe a month or 2 ago.
Postmaster
Joined: Mar 2011
Posts: 2,698
Likes: 7
From: Taxachusetts
Have you adjusted the mixture screws using a vacuum gauge?
Correct gap on the plugs?
Pinging at higher RPMs is an indication of too much timing and/or vacuum advance.
Are you running the stock DSII distributor? I think 76 was the first year for 'em. The reason I ask is that the vacuum advance can on these bad boys is adjustable.
Correct gap on the plugs?
Pinging at higher RPMs is an indication of too much timing and/or vacuum advance.
Are you running the stock DSII distributor? I think 76 was the first year for 'em. The reason I ask is that the vacuum advance can on these bad boys is adjustable.
Thread Starter
|
Cross-Country
Joined: Mar 2016
Posts: 94
Likes: 0
I am not using the stock distributor I have tried adjusting the the fuel mixture screws and it should need to be leaned out but when I lean it out it does not want to start in the morning/it is really hard to start and doesnt run right.
Postmaster
Joined: Mar 2011
Posts: 2,698
Likes: 7
From: Taxachusetts
Well now....see those questions in post #2? They are questions...they're particular questions for a reason, and they have the little "?" at the end. Without you answering the questions asked we don't know with what we're dealing. Just stating the same problems again will not help us diagnose the illness. It's like asking, "Why won't my vehicle start?"
I can't speak for the others on this site but I flunked mind-reading class in the second grade.
So, again...Have you adjusted the carb's mixture screws using a vacuum gauge?
Are the plugs gapped correctly? Pull a couple plugs and read 'em. What do they tell you?
What distributor are you using? The MSD one, no?
Does it have a vacuum advance can on it?
What's the timing set at?
So you have a Holley Demon 4v carb....when she starts, does the exhaust smell very "rich" such that it makes you eyes water?
I can't speak for the others on this site but I flunked mind-reading class in the second grade.
So, again...Have you adjusted the carb's mixture screws using a vacuum gauge?
Are the plugs gapped correctly? Pull a couple plugs and read 'em. What do they tell you?
What distributor are you using? The MSD one, no?
Does it have a vacuum advance can on it?
What's the timing set at?
So you have a Holley Demon 4v carb....when she starts, does the exhaust smell very "rich" such that it makes you eyes water?
Thread Starter
|
Cross-Country
Joined: Mar 2016
Posts: 94
Likes: 0
Have you adjusted the mixture screws using a vacuum gauge?
I have tried adjusting the mixture as I stated before, I tried to lean them out because it smelled rich and it would not want to start in the mornings.
Correct gap on the plugs?
I have not checked the gap on the plugs nor do I know how to do this
Are you running the stock DSII distributor? I think 76 was the first year for 'em. The reason I ask is that the vacuum advance can on these bad boys is adjustable.
No I am using the msd one and it has the vacuum advance can on it.
I dont know what the timing is set at. I have the demon brand street demon 4v carburetor that is a 625 cfm carb.
I have tried adjusting the mixture as I stated before, I tried to lean them out because it smelled rich and it would not want to start in the mornings.
Correct gap on the plugs?
I have not checked the gap on the plugs nor do I know how to do this
Are you running the stock DSII distributor? I think 76 was the first year for 'em. The reason I ask is that the vacuum advance can on these bad boys is adjustable.
No I am using the msd one and it has the vacuum advance can on it.
I dont know what the timing is set at. I have the demon brand street demon 4v carburetor that is a 625 cfm carb.
Postmaster
Joined: Mar 2011
Posts: 2,698
Likes: 7
From: Taxachusetts
Yes, you've stated 3 times that you've tried adjusting the mixture.....but have you tried doing it with a vacuum gauge?
If you don't know how, just ask!
Plug gap/reading plugs....we'll get that in a bit.
Let's try this: On the carb, and while the engine is running, slowly turn one mixture screw in....not such that they're "cranked" in, but so that they're just lightly bottomed out.
Is she still running or did she croak? Answer, please.
If she's still running, do the same to the other mixture screw...... let us know the results, please?
If you don't know how, just ask!
Plug gap/reading plugs....we'll get that in a bit.
Let's try this: On the carb, and while the engine is running, slowly turn one mixture screw in....not such that they're "cranked" in, but so that they're just lightly bottomed out.
Is she still running or did she croak? Answer, please.
If she's still running, do the same to the other mixture screw...... let us know the results, please?
Senior User
Joined: Oct 2014
Posts: 130
Likes: 1
From: Pilot Mound, Iowa
"Yes, you've stated 3 times that you've tried adjusting the mixture.....but have you tried doing it with a vacuum gauge?"
Without a vacuum gauge your just guessing or pissin in the wind. Neither works very well. FWIW I have one mounted in the engine compartment and in the cab.
Jeff
Without a vacuum gauge your just guessing or pissin in the wind. Neither works very well. FWIW I have one mounted in the engine compartment and in the cab.
Jeff
Trending Topics
Thread Starter
|
Cross-Country
Joined: Mar 2016
Posts: 94
Likes: 0
I have a vacuum gage but have not had time to do anything with the carburetor today I will check when I get home and let you know sometime tonight. Also Sometimes after start up if it idles in drive it will sometimes die.
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
DaizeeDoesIt
1967 - 1972 F-100 & Larger F-Series Trucks
56
Apr 2, 2018 08:31 PM
olddudeoldford
1973 - 1979 F-100 & Larger F-Series Trucks
9
Jan 11, 2015 05:00 AM
treetruck
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
18
Dec 27, 2010 12:55 AM
Boba Fett
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
6
Jul 8, 2007 09:48 PM
Racerdave
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
7
Apr 16, 2003 02:51 AM
