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Barely runs when restarting on a Hot Day after the engine was Hot S40-V40

At 250K miles, this could be a host of problems. My first thought is that the throttle body (butterfly) is dirty. When you give it a little gas while the engine is stumbling, this opens the TB and allows more air to flow. Also check the air filter.

Make note of the coolant temperature when you attempt to restart the engine, it should be slightly elevated because the coolant was not flowing. The dash gauge is connected to the ECT sensor which is no longer a separate item in your car.

When you park the car for the day, can you check to spark plugs for fouling? You may have a dirty injector or two and they could be leaking fuel into the cylinder. But you would need to do that real soon, before the engine cools off. Not a lot of fun when it is hot outside and the engine is even hotter.
--
Keeping it running is better than buying new






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