Carburetor? Please Help!!!
Thread Starter
Intermediate
Joined: May 2001
Posts: 27
Likes: 0
From: waterford
Carburetor? Please Help!!!
Cylinders 2,4,6,8 are not firing! Engine runs very rough with pedal to floor. Exhaust manifold for 1,3,5,7 hot, 2,4,6,8 COLD!!! Coming out of garage kept storage. Ran fine when parked, started few times over Winter. What's up!
Please help Thanks
Please help Thanks
Racer
Joined: Oct 2003
Posts: 376
Likes: 0
From: NE PA PA
Re: Carburetor? Please Help!!! (kjsmarty)
You are right"that does not sound very good" Do you have spark to the cyl that are not firing? Do you have dual exhaust, if so maybe a mouse nest in one pipe :smash: :cheers:
Le Mans Master
Joined: Mar 2002
Posts: 7,456
Likes: 2
From: Coming home from Luckenbach Texas
Re: Carburetor? Please Help!!! (JBR)
I'm gonna agree with the mouse nest in exhaust theory. Both primary carb barrels feed both engine banks -- it isn't one barrel per bank. And the ignition doesn't favor one side over the other -- unless wires are cut. Same goes for valvetrain. What's left? Blocked exhaust... :confused:
Thread Starter
Intermediate
Joined: May 2001
Posts: 27
Likes: 0
From: waterford
Re: Carburetor? Please Help!!! (page62)
Thanks for help. Yes- dual exhaust. Could a mouse nest really block exhaust and would it cause no firing on that side of the engine? And are you positive one side of the carburetor (1973 Q-Jet) doesn't fuel just one side of the motor.
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Instructor
Joined: Feb 2004
Posts: 133
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From: Kaysville Utah
Re: Carburetor? Please Help!!! (kjsmarty)
A heat riser stuck wouldn't have that effect, more air would just be brought in from the other heat riser Try this, it will take $.99 and twenty minutes, unbolt the carburetor, take the top off and spray some carb cleaner down where the jets are. My guess is that one of your jets is plugged, I had this same problem on my 81.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
Re: Carburetor? Please Help!!! (kjsmarty)
Want new mufflers? Saw the tail pipe somewhere so whatever obstruction is there can be blown out...
This is a really messed up problem. I can't wait to hear what the hell is causing it!
-Steve
This is a really messed up problem. I can't wait to hear what the hell is causing it!
-Steve
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
Re: Carburetor? Please Help!!! (kjsmarty)
If there were anything in the pipe then, it would most likely get blown out. That would have a s***load of force on it and it would get broken up... I think there may be something wrong with the passenger side cylinder head?
-Steve
-Steve
Racer
Joined: Nov 2000
Posts: 369
Likes: 1
From: Finland
Re: Carburetor? Please Help!!! (Willis)
A heat riser stuck wouldn't have that effect, more air would just be brought in from the other heat riser
I'm thinking maybe the heat riser valve is stuck in closed position and perhaps the crossover is a little blocked by carbon?? It could cause bad running I guess.
I don't think it's a carb problem because even if there's something wrong with it the dualplane intake shouldn't leave 2,4,6,8 all without gas.
Instructor
Joined: Feb 2004
Posts: 133
Likes: 0
From: Kaysville Utah
Re: Carburetor? Please Help!!! (Tomi72)
A heat riser stuck wouldn't have that effect, more air would just be brought in from the other heat riser
We must be talking about a different thing (probably my bad), on my 72 there is only one heat riser, it's the valve thingy on the passenger side exhaust between the manifold and pipe. When it's closed the exhausts are supposed to run to the exhaust manifold on the otherside through the crossover in the intake and heat it up. The heat riser should open when it warms up.
I'm thinking maybe the heat riser valve is stuck in closed position and perhaps the crossover is a little blocked by carbon?? It could cause bad running I guess.
I don't think it's a carb problem because even if there's something wrong with it the dualplane intake shouldn't leave 2,4,6,8 all without gas.
We must be talking about a different thing (probably my bad), on my 72 there is only one heat riser, it's the valve thingy on the passenger side exhaust between the manifold and pipe. When it's closed the exhausts are supposed to run to the exhaust manifold on the otherside through the crossover in the intake and heat it up. The heat riser should open when it warms up.
I'm thinking maybe the heat riser valve is stuck in closed position and perhaps the crossover is a little blocked by carbon?? It could cause bad running I guess.
I don't think it's a carb problem because even if there's something wrong with it the dualplane intake shouldn't leave 2,4,6,8 all without gas.
