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78brncoxlt · 11-07-2009, 04:32 PM

does this sound right. I used a vacuum gauge to adjust the air fuel on my 2150.The instructions said to keep turning the screws out until highest possible vacuum is achieved.If I do this I end up 5 turns out.Then it idles at 800rpm in neutral and 650 in gear.now the idle screw has to backed off all the way and when i shut off the key it will keep running for a couple seconds.
thanks for your input.

http://www.supermotors.net/registry/17695

***jopes*** · 11-07-2009, 07:17 PM

they should roughly be 2 turns out.

you have something wrong with your carb, or you have a vacuum leak.

vreference · 11-09-2009, 07:42 PM

Mine won't even run on the idle circuit at 2.5 turns out. I think I'm closer to 5 or 6. Also, the '78 351m/400m has longer springs on the adjustment screws than other 2150s including 351w; which to my mind, seem to indicate they expected them to be farther out. Considering how well mine runs, especially at idle, I don't think there is anything wrong with it.

11-07-2009, 04:32 PM	#1
78brncoxlt Registered User Join Date: Sep 2004 Location: San Diego CA Posts: 171 iTrader: (0) Bronco Info: 78ranger xlt 400.040 edelbrock int 2" lift 33"bfg C6 dana 44 np-205 9" orig. paint & int.no rust 78brncoxlts Garage	air fuel mixture 2150 does this sound right. I used a vacuum gauge to adjust the air fuel on my 2150.The instructions said to keep turning the screws out until highest possible vacuum is achieved.If I do this I end up 5 turns out.Then it idles at 800rpm in neutral and 650 in gear.now the idle screw has to backed off all the way and when i shut off the key it will keep running for a couple seconds. thanks for your input. http://www.supermotors.net/registry/17695

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air fuel mixture 2150

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11-09-2009, 07:42 PM	#3
vreference Registered User Join Date: May 2009 Posts: 244 iTrader: (0) Bronco Info: 1978 Custom, 4 Speed, 6" Deavers, James Duff Radius Arms, Shackle flip, DetroitLocker 9", Aussie D44 vreferences Garage	Mine won't even run on the idle circuit at 2.5 turns out. I think I'm closer to 5 or 6. Also, the '78 351m/400m has longer springs on the adjustment screws than other 2150s including 351w; which to my mind, seem to indicate they expected them to be farther out. Considering how well mine runs, especially at idle, I don't think there is anything wrong with it.