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Why does 97 pathfinder run rough when first started cold but smooths out after run for a few min?
Wiki User
∙ 14y ago
When you first start the vehicle, it's running in the "open loop" mode....i.e. the computer is not yet being fed input from the various sensors and runs in a default mode. This is okay when the engine is fresh and clean but with wear and crud buildup on a higher mileage engine, the default settings no longer cut it. As the engine warms to operating temperature, the system goes into "closed loop", the sensors begin to do their job and the computer adjusts mixture and timing for optimum performance.
Wiki User
∙ 14y ago
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sand paper
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