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Author Topic:   CARB PROB ?????
BIGDADDYBOZ
Member
posted April 18, 2004 03:08 AM
My car runs good idle and packing the track, but when the greens falls so does my car spitting and sputtering and completly dies for about a half lap. After half a lap or so it takes off and runs great for except a little sputter at higher r's. Anyone have anyideas what is the prob? Thanks


racerman707
Member
posted April 18, 2004 06:39 PM
Has it been sitting for a while? What kind of carb?


Earl Parker II
Member
posted April 18, 2004 09:11 PM
How much fuel pressure do you have at idle and what kind of fuel pump do you have?

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Earl Parker II www.parkercarburetion.com www.holleypartsforsale.com
704.482.7588

[This message has been edited by Earl Parker II (edited April 18, 2004).]

BIGDADDYBOZ
Member
posted April 18, 2004 10:02 PM
It's a Rochester 2 bbl it sat all winter. I have a Carter race fuel pump.


Earl Parker II
Member
posted April 19, 2004 10:32 AM
I would do three things, at least to start:

1. Rebuild the carburetor, just on general principles. A fresh set of gaskets, a new needle & seat, etc. wouldn't hurt a thing. The 2bbls. are a snap to rebuild.

2. Check your fuel pressure. If it's 8.0 to 8.5 psi (which I strongly suspect it is), get a good fuel pressure regulator, like the Holley 12-704, plumb it into the fuel line after all filters and set the pressure at 4.5 to 5.0 psi. That alone should make quite a difference.

3. Setup your idle system properly. Make sure the butterflies are within .020" (eyeballing is good enough) of the bottom of the transfer idle slot at curb idle then adjust each mixture needle for the highest idle RPM, i.e., find the "sweet spot" where turning each mixture needle one way or the other lowers the RPM. Don't sweat the exact idle RPM as long as you find the sweet spot and don't worry about the mixture needles winding up the same number of turns out. If you have to open the butterflies somewhat to get it to idle right off the bat, adjust the mixture needles for best RPM then return the butterflies to the correct position. Having the butterflies in the correct position at curb idle and optimizing the idle fuel mixture will also help quite a bit.

Try the above then come back to us if you have any more problems.

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Earl Parker II
www.parkercarburetion.com
www.holleypartsforsale.com
704.482.7588


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