Warming up an engine in winter is obsolete with modern fuel injected engines Idling to warm up an engine was for carbureted engines A carburetor is an atomizer. It uses engine vacuum to draw fuel from the carburetor bowl and spray it into the intake manifold as droplets. But that fuel can’t burn well until it’s vaporized, and that’s where the warm-up requirement came into the picture. Without a warm up, driving a cold carbureted engine caused stalling and flooding. How the carburetor warm-up process worked The heat riser valve … Read More

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