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Old 07-16-2011, 01:46 PM   #1
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1979 Truck 20R carb tuning help?

I have looked but cannot find the factory specs for the idle air mixture screw, I know it is running rich, but how much I do not know. It was 5 turns out from closed.
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Old 07-17-2011, 09:55 AM   #2
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Is there a way to tune it?
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Old 07-23-2011, 09:14 PM   #3
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bring it to a shop and get a tune up, sounds like you wouldn't know where to start lol
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Old 02-05-2012, 05:34 PM   #4
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Truck is tuned up. new plugs, wires, cap rotor, air filter fuel filter... everything that I can think of that can affect tuning... I was getting around 15mpg, now about 12mpg. Driving is 60 highway/40city, driven aggressively for the little truck. Nothing rebuilt... any specs? I cannot find them anywhere.
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Old 02-09-2012, 10:08 PM   #5
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lean it out until it idles highest, then make it a little richer
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Old 02-10-2012, 05:49 AM   #6
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Usually, turn the idle mixture screw in until it just bottoms out, the unscrew about 2 1/2 to 3 1/2 turns. Start engine and set the idle speed to around 750-800 rpm. Adjust the mixture screw in/out 1/2 turn to get smooth idle. I usually bump the throttle after each adjustment checking for smooth acceleration off idle.

You can download the FSM here http://www.ncttora.com/fsm/ Scroll down to the 79-85 section. There's a lot of info in this PDF file. Carb adjust is in the fuel section

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Old 02-10-2012, 10:11 AM   #7
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Quote:
Originally Posted by Yota1979 View Post
bring it to a shop and get a tune up, sounds like you wouldn't know where to start lol
That is not very nice we are a helpful community my man
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I have looked but cannot find the factory specs for the idle air mixture screw, I know it is running rich, but how much I do not know. It was 5 turns out from closed.
Would this be a stock carb or a weber carb or asia carb?
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Old 02-10-2012, 12:11 PM   #8
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The factory carb btw.
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Old 02-10-2012, 12:35 PM   #9
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5 turns out sounds extremly rich, any mods? i expect your plugs were looking black, most carbs, you will bottom out the air mixture screw(s) then start at 1 1/2 turns out, if doing by ear, i would do what was mentioned above by lons81. jmo
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Old 02-10-2012, 03:41 PM   #10
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Stock engine, 360k or 460k miles. (Uncle can't remember how many times it rolled over)
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Old 02-10-2012, 03:41 PM
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1979, 20r, 79, adjustment, back, carb, carburetor, chevy, columbia, hilux, idle, toyota, toytota, truck, tuning

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