issues starting and rough idle
Thread Starter
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Junior User
Joined: Aug 2013
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From: WI
issues starting and rough idle
I have an 86 f150 with the inline 6, i recently did a head gasket on it and cant get it to run right after for the life of me. yes its an 86, but all the feed back carb stuff has been removed vac lines plugged ect. has an i belive 82 carter carb along with intake and exhaust manifolds. symptoms are, hard to start, will barely idle when cold, idles rough, no matter where i move the distributor, doesn't like to rev up(till its hot, like running 10mins), will back fire out carb, sometimes die, and sometimes will sputter after i turn the key off, i had none of these issues when i bought it, all came after changing the head gasket.
things i've tryed
-retiming it, by moving the dis.
-new plugs
-putting rvt on carb gasket mating surface
thats about it, tell me what u think
things i've tryed
-retiming it, by moving the dis.
-new plugs
-putting rvt on carb gasket mating surface
thats about it, tell me what u think
Thread Starter
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Junior User
Joined: Aug 2013
Posts: 63
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From: WI
it might, i wasnt the one that did the swap, oh, and once it gets warm it seems to go away, like revs fine and stuff, but still idles weird
FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
Sounds like it is very lean. If so, it could be a bad gasket between the intake manifold and head, a bad gasket under the carb, or a large vacuum line cracked or open. In any event, I think it is getting air somewhere that is leaning it out so much during warmup that it won't hardly run.
Get a can of carb or brake cleaner and squirt it at those gaskets while the engine is running. If you get it into the intake the engine will speed up and you'll know where the leak is.
Get a can of carb or brake cleaner and squirt it at those gaskets while the engine is running. If you get it into the intake the engine will speed up and you'll know where the leak is.
Thread Starter
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Junior User
Joined: Aug 2013
Posts: 63
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From: WI
Sounds like it is very lean. If so, it could be a bad gasket between the intake manifold and head, a bad gasket under the carb, or a large vacuum line cracked or open. In any event, I think it is getting air somewhere that is leaning it out so much during warmup that it won't hardly run.
Get a can of carb or brake cleaner and squirt it at those gaskets while the engine is running. If you get it into the intake the engine will speed up and you'll know where the leak is.
Get a can of carb or brake cleaner and squirt it at those gaskets while the engine is running. If you get it into the intake the engine will speed up and you'll know where the leak is.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
I almost asked if you re-used the intake gaskets, but didn't. NO! YOU DIDN'T DO THAT!? Bad idea.
I'll bet that's where the problem is. You have a vacuum leak between the head and the intake manifold. You should be able to prove it with a can of brake cleaner.
I'll bet that's where the problem is. You have a vacuum leak between the head and the intake manifold. You should be able to prove it with a can of brake cleaner.
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Junior User
Joined: Aug 2013
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From: WI
so if i do that problem solved u think? lol, i do it on mowers, but mowers are alot different, lol, guess i ll get one nex time im in twon, then now i gotta re fix the timing, cuz i messed with it and it was never broke, lol, me hits head on wall
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FTE Legend
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lol, just the carb one, and i siliconed it, but its probably the intake leaking
Thread Starter
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Junior User
Joined: Aug 2013
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From: WI
ok, i put a new intake gasket in, same stuff, back fires when tryed to give gas, and sometimes dies. so im kinda clueless what else can it be? its fine when cit gets hot, but till then its iffy
FTE Legend
Joined: Jul 2010
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From: Northeast, OK
If it is fine hot and not cold then you don't have the choke adjusted properly. But, some of the carbs for the 300 have rivets that have to be drilled out. Check out your choke and if you don't know how don't be afraid to say so.