| 摘要 |
PROBLEM TO BE SOLVED: To reduce unevenness of air-fuel ratio detection sensitivity among cylinders of an exhaust emission manifold provided with an air-fuel ratio sensor and to improve air-fuel ratio feedback control performance and exhaust emission control performance. SOLUTION: A first streamlining plate 9 extending onto the downstream side from a join part of a branch pipe 2a connected with No.2 cylinder and a branch pipe 2b connected with adjacent No.4 cylinder is provided, and the air-fuel ratio sensor 8 is arranged on the downstream side thereof. The first streamlining plate 9 is inclined onto a branch pipe 2a side where the exhaust gas touches a detection part 8a of the air-fuel ratio sensor 8 most hard to suppress the touch of the exhaust gas. A second streamlining plate 10 shorter than the first streamlining plate 9 is provided by tilting it onto a branch pipe 2d side in a join part of the branch pipe 2a and a branch pipe 2d connected with No.3 cylinder to adjust an escape amount of the exhaust gas from the branch pipe 2a properly.
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