Carb issues
Thread Starter
|
Mountain Pass
Joined: Apr 2010
Posts: 126
Likes: 4
Carb issues
Did some searching and couldn't find anything specific to my problem.
78' F150, 300 I6 w/ Carter YF 1bbl.
I rebuilt the carb a few weeks ago and I am having problems with it idling and running. I set all adjustments to what the carb kit instructions said to do. It acts like a vaccum leak, but I have checked everything I can think of with propan and found no leaks. I even cleaned and tightend connections. When it trys to idle the RPM's will increase, then decrease and keep repeating in a cycle till it eventually dies. I tried adjusting the mix screw and it helped some, but didn't make a complete fix. Even running at partial throttle it will do the same RPM cycle then die even sooner. I don't know what else to do, I even went through the carb again and checked all adjustments. Please help, this is really frustrating! Thanks!
78' F150, 300 I6 w/ Carter YF 1bbl.
I rebuilt the carb a few weeks ago and I am having problems with it idling and running. I set all adjustments to what the carb kit instructions said to do. It acts like a vaccum leak, but I have checked everything I can think of with propan and found no leaks. I even cleaned and tightend connections. When it trys to idle the RPM's will increase, then decrease and keep repeating in a cycle till it eventually dies. I tried adjusting the mix screw and it helped some, but didn't make a complete fix. Even running at partial throttle it will do the same RPM cycle then die even sooner. I don't know what else to do, I even went through the carb again and checked all adjustments. Please help, this is really frustrating! Thanks!
Thread Starter
|
Mountain Pass
Joined: Apr 2010
Posts: 126
Likes: 4
I ran just fine before the rebuild. Then the carb started to leak gas, that's why I rebuilt it. My brother and I thought maybe the PO had messed with the mixture and other setting to compensate for a vaccum leak and I just haven't found all of them yet. Could it be something else?
Fleet Mechanic
Joined: Feb 2007
Posts: 1,326
Likes: 48
From: Middle TN
Take each vac line and plug it off at the tree and see if you can isolate the vac leak.
But logically it should be a problem with removing and installing the carb or rebuilding the carb.
I would look closely at the float level.
But logically it should be a problem with removing and installing the carb or rebuilding the carb.
I would look closely at the float level.
Thread Starter
|
Mountain Pass
Joined: Apr 2010
Posts: 126
Likes: 4
4x4- I'm doubting it's a float issue, I double checked it when I went back through it the other day. I'll go through the vaccum tree like you mentioned and see if it's there. Thanks for the advice!
Thread Starter
|
Mountain Pass
Joined: Apr 2010
Posts: 126
Likes: 4
Trending Topics
New User
Joined: Nov 2020
Posts: 24
Likes: 0
It was worse before. Blowing black smoke. I bought the truck for a dollar as a non running truck. My Grandson wanted one of my trucks so I decided to give this one to him. It has been an ordeal to get it to this point (running) I did contact the carb rebuild-er today and it is under warrenty so I am sending it back tomorrow for them to look at it.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
