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Old 10-13-2017, 09:21 PM   #1 (permalink)
Join Date: Sep 2016
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Default Choke/Cold Idle Problems

I have a 1986 Samurai with stock Hitachi carb.

My car runs well when warm, but I am having problems with the cold idle. For the last 6 months I have been driving it with the choke held open and the cold idle set screw screwed all the way in. The car would start and idle at around 800 rpm cold and warm.

Today I took the carb off and made sure everything in the choke linkage was moving as it should, and it was. The choke plate closes under spring power and opens from the vacuum actuator, throttle, and coolant temp. I put it back and started the car.

It idles pretty rough at like 700 rpm, but when I take off the the air horn while running, thereby disconnecting the vacuum hose from the intake connecting the two, the idle immediately raises to 1300-1400, going strong right where I want it to be. When I started the car without the air horn, it started at the 700 rpm the same way until I played with the choke plate by hand and it settled at the same high idle. I couldn't tell a visible difference and do not know what is going on. When the engine is hot everything works as expected and I get 23 mph with a big rack on top.

Anybody have any insight? Thanks!
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