Question about 1987 Toyota Pickup

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22R Carb at high altitude

I recently moved to Colorado and my 87 toyota pu with 22r (carb) is back firering and bogging, i think do to the alttitude. Is there a simple adjustment i can do fix this?

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Yes, Colorado is much higher in altitude. Do to higher altitude the barometric pressure is less than sea level by a long shot. Lower barometric pressure mean that less air is entering your engine. Which in turns mean that your engine is now running richer than it was at a a lower altitude. So I recommend checking you engine timing, and adjusting your carbs air/fuel mixture. yes this means that you may need to rejet. but first there is a screw on your 22r's carb that you must adjust to lean the air mixture just right. I have had a stock 22r carbortor before and never had to rejet it. i probibly should have but it ran fine at sea level and all the way to about 10000 ft. after 10000 feet i had to lean the fuel mixture to even alow the engine to run. This screw that you must turn is hidden due to toyota not wanting you to tamper with it and burn your engine to the ground by running your engine to lean. it has a metal plug on the passenger side of the carb about the size of a pencil eraser. you must drill that out and then you can adjust the air fuel mixture. Clock wise is to lean the air fuel. and Counter clock wise is to richen the air fuel mixture.A good rule of thumb is to turn the air/fuel screw all the way clock wise and then back out about 2 and 1/2 turns. That is the factory adjustment. you may only need 2 turns out. Best of luck i hope you get it running perfect. Try this adjustment first then if it still runs rich then think about rejetting.

Here is a picture of what i am talking about.

#1 is the air/fuel mixture, #2 and #3 are cold and warm idle screws.
#4 is a A/c idle adjustment.

22R Carb at high altitude - 5ff308f.jpg

Posted on May 06, 2009

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D,
You didn't say what part of CO you moved to and what that altitude may be, but if you are over 6500 feet, your carbed engine may need to be rejetted to make up for the thinner air. Not sure if you have the asian or weber carb either, but there is plenty of info on both out there. Before you mess with the carb though, check for vacuum leaks and make sure the choke is not sticking,

Posted on Oct 15, 2008

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