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09-30-2014, 04:53 PM
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#1 |
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Registered User
Join Date: Sep 2014
Location: Roseville, California
Posts: 4
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Runs better with vac advance unhooked (Help)
Like the title says, when vac advance hooked up it idles good. When I give it any gas it starts to miss (sputter). The sputter is all through the RPM range. I pulled the vac advance hose off the manifold vac and capped the port and it runs much better. I think I still feel a small miss but almost imperceptible.
I need someone to help me through the rest of the diagnostics. I am wondering if I need to replace my vac can on the distributor (bad diaphragm maybe). I'll be putting a vac pump on it to see next when I get home. Let me know what I've left out in my signature. Thanks.
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1973 C10 Cheyenne Short Fleetside, 2" front spring drop / 5" axle flip drop, 1973 350ci base timing is 12* BTDC (142-148 dry compression readings), HEI w/ 15* Vac. Adv. and 20* centrifugal, Holly Contender Intake #8 runner vac. port capped, Eldelbrock 1406 (fresh rebuild main jets?, secondary jets?, 7547 needles, springs yellow 4") Vac. Adv. on manifold port, stock heads ?, unknown header 2-7/8" collector, dual exhaust (no crossover), th400 with shift kit, 12 bolt open diff, unknown gears, 28 OD tires. |
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