I have an 87 FJ60 with a 2F and an Aisin Carb. The truck is desmogged. Ever since I bought the car in August it has had a high idle speed. The carb has allegedly been tuned by Jim C under previous ownership.
When the car is started cold, it takes a fair amount of pumps (5-10) to get it to fire. It initially idles at about 750-800.
The idle speed when warmed up is 1500 RPM. The High Idle when the choke is pulled in when warmed up is 2000 RPM. When I adjust the idle speed screw looser (counter clockwise) on the carb (air filter on and all vacuum lines hooked up as when I bought it), nothing happens. I can turn it 3 complete revolutions with no effect. When I tighten that screw (clockwise) from the position that I found it in maybe 1/2 to 1 turn, the RPM jumps to 2000 RPM.
Any thoughts on what the problem could be?
When the car is started cold, it takes a fair amount of pumps (5-10) to get it to fire. It initially idles at about 750-800.
The idle speed when warmed up is 1500 RPM. The High Idle when the choke is pulled in when warmed up is 2000 RPM. When I adjust the idle speed screw looser (counter clockwise) on the carb (air filter on and all vacuum lines hooked up as when I bought it), nothing happens. I can turn it 3 complete revolutions with no effect. When I tighten that screw (clockwise) from the position that I found it in maybe 1/2 to 1 turn, the RPM jumps to 2000 RPM.
Any thoughts on what the problem could be?
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