Help please...base timing 305 tbi - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**LEEVON** · 05-27-2008, 06:02 AM

just got through with the lovely task of replacing the intake manifold gasket on my '87 305 TBI. The truck runs fine, but I am trying to set base timing to 0* per factory specs. I found the tan/black wire that controls timing advance just below the bulkhead connector and unplugged it. I can't get the truck to idle all the way down to 0* connected or disconnected. It dies at about 8-10* even with some throttle.

jeffspower · 05-27-2008, 06:11 AM

Wierd. Could the balancer rubber be going bad, causing it to slip? That will of course make the timing read faster than it actually is. A vac. gauge might help determine if this is what has happened.

Or, possibly a vac. leak?

05-27-2008, 06:02 AM	#1
LEEVON Moderator Join Date: Jul 2006 Location: Ozark, MO Posts: 4,893	Help please...base timing 305 tbi just got through with the lovely task of replacing the intake manifold gasket on my '87 305 TBI. The truck runs fine, but I am trying to set base timing to 0* per factory specs. I found the tan/black wire that controls timing advance just below the bulkhead connector and unplugged it. I can't get the truck to idle all the way down to 0* connected or disconnected. It dies at about 8-10* even with some throttle. __________________ '86 GMC C30 Crew ~ '86 C20 Crew ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '74K10 ~ '71 Cheyenne swb ~'50 3100 bagged ~ '80 Wife ~ Late model kids

05-27-2008, 06:11 AM	#2
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: Help please...base timing 305 tbi Wierd. Could the balancer rubber be going bad, causing it to slip? That will of course make the timing read faster than it actually is. A vac. gauge might help determine if this is what has happened. Or, possibly a vac. leak? __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.