試題詳解

185. 多點噴射汽油引擎怠速運轉不穩，但當轉速增加時則運轉平穩，進行檢修時排放氣體檢測數據如圖所示，下列何者較不可能為故障原因？

(A)Aleaking intake manifold gasket
(B)A partially clogged fuel injector
(C)Asecondary ignition wire shorted to ground
(D)An EGR valve pintle thatdoes not fully close 。