Can you suggest anything? Timing issue - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tynee · 06-06-2004, 10:54 PM

I have a guess on what my problem is (beyond the obvious), but I'd like the input of the wise and knowledgable sages of this board.

My weekend was spent replacing the intake manifold and carburator on my 307. I went from stock to a stock 350 manifold with a new Edelbrock 1406. I forgot to make any kind of marks on my ditributor when removing it, so when I reinstalled it, I didn't know which direction to install. When I got it put back together, I tried to start it and all I got was the biggest backfire I've ever heard from this truck. At this point I figured I had my distributor in 180 degrees off. I pulled it and reinstalled. Long story short, when I finally got the truck to start it was only with the distributor advanced as far as it would go. The problem is, with the distrbutor turned all the way counter-clockwise, I'm still only getting to 8 degrees AFTER T.D.C. I'm Idling at 550 RPM, and acceleration is smooth but weak.

Sorry for the length of the post, hopefully somebody will ubderstand the question I'm asking. Thanks in advance for any help.

Russell · 06-07-2004, 12:04 AM

Pull the dizzy out and move it over one notch in the direction you need to have it at, you're running it wayyy too retarded, and won't have any power at all this way...

So yeah, just lift the dizzy a little bit, then slide the rotor over one notch so it falls all the way back down with the rotor once notch over, then put the cap back on aiming the rotor tip at the first spark plug tower, then fire it up and fine tune it from there

72gord · 06-07-2004, 08:43 AM

When you move it one tooth on the distributor gear you will have to bump the starter or turn the motor a little by hand to get the dist. to engage down onto the oil pump drive. Just like Russel said though...one tooth off.

Tynee · 06-07-2004, 07:14 PM

Maybe I'm not understanding something, but if I move the dizzy one tooth how do I get the slot on the bottom of the dizzy shaft to seat back onto the oil pump?

neonlarry · 06-07-2004, 07:36 PM

Use a long screwdriver to orient the oil pump shaft so it will seat.

Tynee · 06-07-2004, 11:12 PM

Thanks for the input fellas. It's Gonna be Thursday or Friday before I get back to the truck. I'll let you know how it goes.

Tynee · 06-11-2004, 08:14 AM

Thanks for the input guys. Moved the dizzy one tooth last night and then couldn't retard it far enough to get it in time. Wound up moving all my plug wires one hole around the cap. After that, I was able to fine tune it exactly where it needed to be.

06-06-2004, 10:54 PM	#1
Tynee I miss this truck. Join Date: Dec 2001 Location: Lexington, KY U.S.A. Posts: 2,863	Can you suggest anything? Timing issue I have a guess on what my problem is (beyond the obvious), but I'd like the input of the wise and knowledgable sages of this board. My weekend was spent replacing the intake manifold and carburator on my 307. I went from stock to a stock 350 manifold with a new Edelbrock 1406. I forgot to make any kind of marks on my ditributor when removing it, so when I reinstalled it, I didn't know which direction to install. When I got it put back together, I tried to start it and all I got was the biggest backfire I've ever heard from this truck. At this point I figured I had my distributor in 180 degrees off. I pulled it and reinstalled. Long story short, when I finally got the truck to start it was only with the distributor advanced as far as it would go. The problem is, with the distrbutor turned all the way counter-clockwise, I'm still only getting to 8 degrees AFTER T.D.C. I'm Idling at 550 RPM, and acceleration is smooth but weak. Sorry for the length of the post, hopefully somebody will ubderstand the question I'm asking. Thanks in advance for any help. __________________ '07 GMC Acadia SLT. Sweet ride. '08 Crew Cab Z-71 short bed. Really like this truck A LOT.

06-07-2004, 12:04 AM	#2
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Pull the dizzy out and move it over one notch in the direction you need to have it at, you're running it wayyy too retarded, and won't have any power at all this way... So yeah, just lift the dizzy a little bit, then slide the rotor over one notch so it falls all the way back down with the rotor once notch over, then put the cap back on aiming the rotor tip at the first spark plug tower, then fire it up and fine tune it from there __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

06-07-2004, 07:14 PM	#4
Tynee I miss this truck. Join Date: Dec 2001 Location: Lexington, KY U.S.A. Posts: 2,863	Maybe I'm not understanding something, but if I move the dizzy one tooth how do I get the slot on the bottom of the dizzy shaft to seat back onto the oil pump? __________________ '07 GMC Acadia SLT. Sweet ride. '08 Crew Cab Z-71 short bed. Really like this truck A LOT.

06-07-2004, 07:36 PM	#5
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,745	Use a long screwdriver to orient the oil pump shaft so it will seat. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

06-07-2004, 11:12 PM	#6
Tynee I miss this truck. Join Date: Dec 2001 Location: Lexington, KY U.S.A. Posts: 2,863	Thanks for the input fellas. It's Gonna be Thursday or Friday before I get back to the truck. I'll let you know how it goes. __________________ '07 GMC Acadia SLT. Sweet ride. '08 Crew Cab Z-71 short bed. Really like this truck A LOT.

06-07-2004, 08:43 AM	#3
72gord Never enough time!! Join Date: Mar 2004 Location: sw Wisconsin Posts: 601	When you move it one tooth on the distributor gear you will have to bump the starter or turn the motor a little by hand to get the dist. to engage down onto the oil pump drive. Just like Russel said though...one tooth off.

06-11-2004, 08:14 AM	#7
Tynee I miss this truck. Join Date: Dec 2001 Location: Lexington, KY U.S.A. Posts: 2,863	Thanks for the input guys. Moved the dizzy one tooth last night and then couldn't retard it far enough to get it in time. Wound up moving all my plug wires one hole around the cap. After that, I was able to fine tune it exactly where it needed to be. __________________ '07 GMC Acadia SLT. Sweet ride. '08 Crew Cab Z-71 short bed. Really like this truck A LOT.



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