On those old IDI's, (if it still works) there is a fast idle solenoid and cold timing advance on the injector pump to help cold starts. With key on waiting for glow plugs, tap and release the throttle before starting. The solenoid can't open the throttle but it can hold it, that's the only reason why you tap the throttle. The high idle is only a few hundred RPM or around 1000 RPM, and it will shut off and return to regular idle automatically around 112*F coolant temp.
Most people never knew about this feature, and the solenoid can get sticky from never being used. If it doesn't work, sometimes you can spray a little wd40 on it and move the plunger in/out a few times. These features are not required for cold starts, but they do help starting and maintaining a smooth idle when cold.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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