Occasionally people give me feedback on the 4runner, or ask some questions. Here is a selection of their comments.
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Just wondering if you can help with tunig a 4runner 4y petrol carb, i know the standard way of tuning a carb but just want to make sure, as i too own a 87 but petrol one, and the girl was complaining about somethings. Cheers mate and being good reading your stuff and learnig something. Regards Chris
Hmm, I played with a 1984 petrol 4y carby once. Sad to say, but it was knackered and all the tuning in the world wouldn't fix it. Best I got was running okay, but chewing the juice...
Perhaps start with a carby rebuild kit for it, I've had a lot of success in the past just hitting a carby with a compressor air blower, can of carby clean, and the rebuild kit. It's a straight forward operation if you are mechanically minded.
Make sure your ignition timing is correct before doing anything - and put in a new set of points first.
Carby "tuning": set the carby idle speed as low as it will go before it stalls. Now twist the carby idle mixture screw until "it runs the best". Do this by turning it in one direction until it starts to cough and splutter, then the other direction until it again starts to cough and splutter. Halfway between these two extremes is "best". Wind down the idle screw down again to the lowest idle speed it will do before stalling and repeat. Once you are satisfied, wind the idle screw back up to get the idle speed at 800-1000rpm, you're done. Now this assumes all the important things are correct - jet sizes and such. If you've changed them, or put in a lumpy cam, or something that will affect the way the engine runs, then they might need changing. A whole new world of pain, I've pretended that they are all okay ;)
