Hello all,
I've got a 71 MGB, with a freshly rebuilt 18GK engine that has about 750 miles on it, running HS4 carbs. The engine has been running great in the past winter months, usually in temperaturs around 50-60 degrees. With the warmer weather, and especially in traffic where there isn't much airflow the idle will, over a period of 5-10 seconds, drop down until the engine finally dies. At stop lights, I have to keep a foot on the gas to keep it from stalling. Afterwards, an extended run with low stress on the engine and some good airflow will the get the idle back up to normal, so it looks like something under the hood is overheating enough to cause this.
I've thought I may be having fuel may be vaporizing in the line, but I am having trouble diagnosing if that is the case. And if it was the case, why would the engine come back to life when I give it a little throttle?
I've just tuned the thing up, adjusted the valves, set timing, adjusted carbs. Any suggestions on where to begin looking would be appreciated. Any suggestions on where to begin looking would be appreciated.
I've got a 71 MGB, with a freshly rebuilt 18GK engine that has about 750 miles on it, running HS4 carbs. The engine has been running great in the past winter months, usually in temperaturs around 50-60 degrees. With the warmer weather, and especially in traffic where there isn't much airflow the idle will, over a period of 5-10 seconds, drop down until the engine finally dies. At stop lights, I have to keep a foot on the gas to keep it from stalling. Afterwards, an extended run with low stress on the engine and some good airflow will the get the idle back up to normal, so it looks like something under the hood is overheating enough to cause this.
I've thought I may be having fuel may be vaporizing in the line, but I am having trouble diagnosing if that is the case. And if it was the case, why would the engine come back to life when I give it a little throttle?
I've just tuned the thing up, adjusted the valves, set timing, adjusted carbs. Any suggestions on where to begin looking would be appreciated. Any suggestions on where to begin looking would be appreciated.