carb issues anyone help....
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New User
Joined: Dec 2003
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carb issues anyone help....
ok my 300 inline 6 on my 1980 f150 idles very low and shakes like crazy i seemed to smooth the shaking out with a tuneup.. however the idle will not adjust at all doesnt matter if u turn the screws they have no effect as if they arent there and when it idles low i get black smoke but when i hild the gas down a lil bit it stops smoking im lost i was told to junk my carb
Junior User
Joined: Jan 2004
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CHECK FOR VACUM LEAKS, AROUND CARB. AND INTAKE. FILL A SPRAY BOTTLE WITH A FEW DROPS OF DISH DETERGENT AND WATER, SPRAY AROUND BASE OF CARB AND INTAKE TO HEAD. IF A CHANGE OF IDLE OCCURS WHILE SPRAYING, THAT'S WHERE THE VACUM LEAK IS. ALSO SPRAY ALL VACUM HOSES TO CHECK FOR LEAKS. CHECK CHOKE, MAKE SURE IT IS FULLY OPEN. THERE COULD BE MANY THINGS CAUSING LOW IDLE. THIS IS WHERE I'D START. ALSO CHECK PCV VALVE, REMOVE IT, IT SHOULD RATTLE WHEN YOU SHAKE IT.
OTHER POSSIBLE CAUSES
FUEL PUMP
HEAT RISER VALVE
OTHER POSSIBLE CAUSES
FUEL PUMP
HEAT RISER VALVE
Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
Originally posted by mopar
CHECK FOR VACUM LEAKS, AROUND CARB. AND INTAKE. FILL A SPRAY BOTTLE WITH A FEW DROPS OF DISH DETERGENT AND WATER, SPRAY AROUND BASE OF CARB AND INTAKE TO HEAD. IF A CHANGE OF IDLE OCCURS WHILE SPRAYING, THAT'S WHERE THE VACUM LEAK IS. ALSO SPRAY ALL VACUM HOSES TO CHECK FOR LEAKS. CHECK CHOKE, MAKE SURE IT IS FULLY OPEN. THERE COULD BE MANY THINGS CAUSING LOW IDLE. THIS IS WHERE I'D START. ALSO CHECK PCV VALVE, REMOVE IT, IT SHOULD RATTLE WHEN YOU SHAKE IT.
OTHER POSSIBLE CAUSES
FUEL PUMP
HEAT RISER VALVE
CHECK FOR VACUM LEAKS, AROUND CARB. AND INTAKE. FILL A SPRAY BOTTLE WITH A FEW DROPS OF DISH DETERGENT AND WATER, SPRAY AROUND BASE OF CARB AND INTAKE TO HEAD. IF A CHANGE OF IDLE OCCURS WHILE SPRAYING, THAT'S WHERE THE VACUM LEAK IS. ALSO SPRAY ALL VACUM HOSES TO CHECK FOR LEAKS. CHECK CHOKE, MAKE SURE IT IS FULLY OPEN. THERE COULD BE MANY THINGS CAUSING LOW IDLE. THIS IS WHERE I'D START. ALSO CHECK PCV VALVE, REMOVE IT, IT SHOULD RATTLE WHEN YOU SHAKE IT.
OTHER POSSIBLE CAUSES
FUEL PUMP
HEAT RISER VALVE
Post Fiend
Joined: Nov 2001
Posts: 5,871
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From: Coutts Canada
It almost sounds like either a stuck choke or a serious vaccum leak. If its a vaccum leak you should hear a hissing sound. This happened to me, and once i found and plugged the leak (one of them anyway) it seemed to fix the problem, but when te carb is a POS (like mine was) it didn't do to much. But check for vaccum leaks (hissing sound) and check the choke to.
Junior User
Joined: Jan 2004
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Originally posted by Big Orn
Why are you YELLING, mopar? And what's up with that handle, huh? Are you trying to tell us something? Please explain.
Why are you YELLING, mopar? And what's up with that handle, huh? Are you trying to tell us something? Please explain.
huh? no yelling. handle (Mopar) is what friends, family and others have called me all my life. have owned mopar car since i could drive. currently own 71 383 roadrunner, 71 hemi cuda, 69 440 6pack roadrunner and 88 t-bird turbo coupe, 85 f-150 351 4v h.o. 4x4, 73 f-100. 460 4v 2 wheel drive???????
Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
Originally posted by mopar
huh? no yelling. handle (Mopar) is what friends, family and others have called me all my life. have owned mopar car since i could drive. currently own 71 383 roadrunner, 71 hemi cuda, 69 440 6pack roadrunner and 88 t-bird turbo coupe, 85 f-150 351 4v h.o. 4x4, 73 f-100. 460 4v 2 wheel drive???????
huh? no yelling. handle (Mopar) is what friends, family and others have called me all my life. have owned mopar car since i could drive. currently own 71 383 roadrunner, 71 hemi cuda, 69 440 6pack roadrunner and 88 t-bird turbo coupe, 85 f-150 351 4v h.o. 4x4, 73 f-100. 460 4v 2 wheel drive???????
Junior User
Joined: Feb 2004
Posts: 87
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From: St.Paul, MN
Sounds like the intake/exhaust manifold bolts have worked loose...vacuum leak and possibly bad gasket (now). Try retorque of those (get a book for sequence) and you may get lucky. I have replaced the gaskets twice on my 83 "300" since I bought it ...actually 3 as I had to replace a cracked manifold immediately (got the truck pretty reasonable)and that required new gaskets.
I use anti-sieze on the bolts as I know I will be doing it again...and maybe in a few days. Darn manifold is heavy, FYI "stick" those new gaskets on w/cement if you have to go that far. Takes 2 hands (and arms) to move the manifold back in place so ya can't be bothered with slipping gaskets.
minus 30 in my back yard last week for those of you complaining about cold at 10 above!
I use anti-sieze on the bolts as I know I will be doing it again...and maybe in a few days. Darn manifold is heavy, FYI "stick" those new gaskets on w/cement if you have to go that far. Takes 2 hands (and arms) to move the manifold back in place so ya can't be bothered with slipping gaskets.
minus 30 in my back yard last week for those of you complaining about cold at 10 above!
