280??SE

Hi,
I have a 1983 280se (European Model), it run great in the cool weather. But when the temperature outside above 75 degree, and the car is running for a
while it stop by it self, and to keep it running I have to step on the gas.
I need help.
Thanks
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It could be the auxilliary air valve (sometimes called the air slide) is 'tired' (faulty). Its what makes the engine idle faster when cold (just started after long stop). As the coolant warms up, it heats up the thermostat inside the device, which closes off the air way, and reduces idle speed to the base idle speed. In winter, the incoming cold air competes with the heating of the coolant water acting on this valve, resulting in this valve remaining open a little bit more than it maybe should. If the idle speed was adjusted in this state, then the car will run OK when 'warm' in cold weather. In warmer weather, the incoming air is not so cold, so the valve will close more. Since the idle speed was adjusted in cold weather, this could result in the idle now being too slow, and the engine stalling.
The remedy may be to have a new auxilliary air valve fitted (this is a bit of a pain, since it requires breaching the water circuit). Then have the idle speed re-adjusted, preferably in warm weather, with the engine warm.
Cheers............. Rob.

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