Tom W
Active Member
Hi all,
My 2200tc normally runs very well, both from cold and at operating temperature. However, if I get stuck in traffic on a warm day, the idle speed drops and becomes very lumpy. The temperature gauge doesn’t move much when it gets warm, it goes from just below half way where it normally sits to just over half way. When I get going again everything behaves normally. I don’t feel the car is going to overheat or let me down, but it really looses its refinement and the engine is so lumpy it shakes the car. Add a tad of throttle and it gets smoother. I think the issue is idle speed related, rather than an a component failing when it gets too warm, or vapour lock.
HIF6 carbs have a bimetallic component in the jet adjusting mechanism. I wonder if this is causing the issue? Possibly the rate of adjustment is inappropriate for modern fuel? I can’t think of anything else that would change with temperature and only cause the idle speed to drop.
My 2200tc normally runs very well, both from cold and at operating temperature. However, if I get stuck in traffic on a warm day, the idle speed drops and becomes very lumpy. The temperature gauge doesn’t move much when it gets warm, it goes from just below half way where it normally sits to just over half way. When I get going again everything behaves normally. I don’t feel the car is going to overheat or let me down, but it really looses its refinement and the engine is so lumpy it shakes the car. Add a tad of throttle and it gets smoother. I think the issue is idle speed related, rather than an a component failing when it gets too warm, or vapour lock.
HIF6 carbs have a bimetallic component in the jet adjusting mechanism. I wonder if this is causing the issue? Possibly the rate of adjustment is inappropriate for modern fuel? I can’t think of anything else that would change with temperature and only cause the idle speed to drop.