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Re: Exhaust bang bang bang [message #366787 is a reply to message #366771] |
Wed, 15 September 2021 08:18 ![Go to previous message Go to previous message](/GMCforum/theme/default/images/up.png) ![Go to next message Go to previous message](/GMCforum/theme/default/images/down.png) |
JohnL455
![United States United States](/GMCforum/images/flags/us.png) Messages: 4447 Registered: October 2006 Location: Woodstock, IL
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Larry, idle mixture setting is a bit like tuning a guitar. Instead of a strobe tuner you use a tach needle. Since we have divided manifolds, each idle mixture screw feeds 4 cylinders discretely. They don’t blend like with an open plane racing manifold. With engine at full 195 temp you slowly adjust each mixture screw to get maximum idle speed. Each screw is only contributing to 4 cyls so it’s a bit of a back and forth process. If they were set wrong, you will have to go and adjust the idle speed screw to get it to 650 so you are in the idle circuit range. The screws only work in a limited range. Never bottom them with any force, and opening past about 3 turns does nothing further. Once you find the max RPM center spot about an 1/8 turn range, stop there. Then turn each screw in very slightly to where it would just want to start losing RPM but does not. You are then at the best lean edge of the best range. The GM lean drop setting would mean then turn one screw in watching tach to lose 25 RPM. Then turn in other screw for a 25 RPM drop. Then go back to the speed scree and add the 50 RPM you lost to get back to the 650. Technically this should be done with the air cleaner in place and the AutoThermAC pre heat active so carb idle air is in the 117F range, but you need to have a flexible carb mixture tool to do it correctly. If your carb throttle shaft is worn as Jim H suggests could be, you will be adjusting to a moving target making it less accurate.
John Lebetski
Woodstock, IL
77 Eleganza II
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Exhaust bang bang bang
By: boybach on Tue, 14 September 2021 11:18
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Re: Exhaust bang bang bang
By: JohnL455 on Tue, 14 September 2021 15:27
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[GMCnet] Re: Exhaust bang bang bang
By: Keith V on Tue, 14 September 2021 16:38
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Re: [GMCnet] Re: Exhaust bang bang bang
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[GMCnet] Re: Exhaust bang bang bang
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Tue, 14 September 2021 21:17
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Tue, 14 September 2021 19:11
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Re: Exhaust bang bang bang
By: boybach on Tue, 14 September 2021 19:18
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Re: Exhaust bang bang bang
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[GMCnet] Re: Exhaust bang bang bang
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Re: Exhaust bang bang bang
By: JohnL455 on Wed, 15 September 2021 08:18
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Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 11:20
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[GMCnet] Re: Exhaust bang bang bang
By: sgltrac on Wed, 15 September 2021 11:32
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 12:35
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Re: [GMCnet] Re: Exhaust bang bang bang
By: mghamms on Wed, 15 September 2021 15:17
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Re: [GMCnet] Re: Exhaust bang bang bang
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 21:29
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[GMCnet] Re: Exhaust bang bang bang
By: sgltrac on Wed, 15 September 2021 16:08
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 17:07
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[GMCnet] Re: Exhaust bang bang bang
By: Rob on Wed, 15 September 2021 17:13
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 21:32
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[GMCnet] Re: Exhaust bang bang bang
By: Rob on Wed, 15 September 2021 21:38
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Re: Exhaust bang bang bang
By: JohnL455 on Wed, 15 September 2021 15:56
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Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 17:03
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Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 17:17
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Re: Exhaust bang bang bang
By: boybach on Thu, 16 September 2021 14:54
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[GMCnet] Re: Exhaust bang bang bang
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[GMCnet] Re: Exhaust bang bang bang
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[GMCnet] Re: Exhaust bang bang bang
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Thu, 16 September 2021 21:11
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[GMCnet] Re: Exhaust bang bang bang
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Fri, 17 September 2021 09:28
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[GMCnet] Re: Exhaust bang bang bang
By: jimk on Fri, 17 September 2021 09:47
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Fri, 17 September 2021 10:40
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[GMCnet] Re: Exhaust bang bang bang
By: Rob on Fri, 17 September 2021 11:22
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Fri, 17 September 2021 11:39
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