What's the deal? Black smoke - 91 454 4 barrell engine

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JonG - 01 Oct 2006 00:41 GMT

Anyone have some suggestions: I have a lot of black smoke blowing from the
dual exhasut on my 1990 Chevrolet 454 4-Barrell carb (it's a P30 truck chasis)
, on my RV. On idle it runs fine. On cold it runs fine. When starting out at
normal acceleration, after it's been warmed up, then getting black smoke on
exhaust. Once it's up to speed, then it runs ok, but sometimes the
acceleration is weak. Feels like the choke or fuel/air mix is not right.

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SnoMan - 01 Oct 2006 01:49 GMT

>Anyone have some suggestions: I have a lot of black smoke blowing from the
>dual exhasut on my 1990 Chevrolet 454 4-Barrell carb (it's a P30 truck chasis)
>, on my RV. On idle it runs fine. On cold it runs fine. When starting out at
>normal acceleration, after it's been warmed up, then getting black smoke on
>exhaust. Once it's up to speed, then it runs ok, but sometimes the
>acceleration is weak. Feels like the choke or fuel/air mix is not right.

Typically the floats in those carbs saturate with gas with age and
cause it to run rich like you discribe. Time foe a new float if carb
has never been rebuilt. (this is a normal occurance)
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TheSnoMan.com

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