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 Post subject: carb?
 Post Posted: Sun Sep 18, 2011 9:02 am 
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Joined: Wed Apr 19, 2006 3:48 am
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Location: Lenoir City Tennessee
i had a hp 1050 dominator on my motor...never had any problems what so ever with it..i let my truck set for a few months and when i cranked it up and drove it everytime i got into the 4 barrels it would pop and crack...i bought a new 950 proform double pumper for it put it on and it does the same thing...so i put a old 850 double pumper i had on it and now it doesnt pop but rolls the black smoke out..i jetted it down to 72 in front and 73 in back put a power valve plug in the rear and it still black smokes from to much gas...why all of a sudden are these carbs acting stupid? any help trying to get them straightened out would be greatly appreciated...my dad use to tune all my carbs and fix them but he passed away back in may and now im clueless...thanks for any help..


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 Post subject: Re: carb?
 Post Posted: Sun Sep 18, 2011 9:26 am 
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When you removed the first one and put on a new one and it did the same thing, that should have told you it wasn't the carburetor in the first place. IMHO you got something horked up besides a carburetor! Plug wires, plugs, timing off???

What kind of fuel pump/regulator and what fuel pressure?

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 Post subject: Re: carb?
 Post Posted: Sun Sep 18, 2011 9:32 am 
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ken i rechecked timing the fuel pressure is the same put new plugs and wires in it...the old 850 does fine as far as the popping but its like its running real rich...has a new msd 7al3 box a new hvc coil...changed the box and coil to..


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 Post subject: Re: carb?
 Post Posted: Sun Sep 18, 2011 12:26 pm 
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Was the change of the ignition box before or after the problems started? :-k

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 Post subject: Re: carb?
 Post Posted: Sun Sep 18, 2011 6:57 pm 
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Location: Lenoir City Tennessee
after...


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 Post subject: Re: carb?
 Post Posted: Sun Sep 18, 2011 8:21 pm 
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Location: Morrison, Co
put the old box back in it and see if the problem goes away

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 Post subject: Re: carb?
 Post Posted: Sun Sep 18, 2011 8:27 pm 
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You may have a rusted valve. You need to compression check and leak-down check it. Popping like that at full load can allow a slightly leaking valve to discharge enough hot material into the intake under high cylinder pressures (WOT) and cause minor firing in the intake manifold leading to sounds from the intake or popping in the exhaust. The resultant pulsing in the plenum can also make a carby run rich.
You should also check the ignition system, things like cap terminals etc as they corrode and cause miss fires. Running a carby rich will solve minor missfires so that may be why one of the carbs works seemingly OK.


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 Post subject: Re: carb?
 Post Posted: Sun Sep 18, 2011 9:00 pm 
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Check valvesprings as well.


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 Post subject: Re: carb?
 Post Posted: Tue Sep 20, 2011 5:57 pm 
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Location: Lenoir City Tennessee
it was an intake gasket...thanks for all the info guys...


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