air leakage

If you already made sure B1S1 O2 sensor and MAF sensor are both ok, then air leakage between MAF and intake manifold is a big suspect, check fuel trim using live data scanner to see if the engine is running too lean or too rich caused by air leakage. Do this after engine is fully warmed up so the close loop control is running.

所有跟帖： 

• 这个检查起来比较麻烦吧？ -原上草2017- ♂ (0 bytes) () 09/23/2019 postreply 16:49:42

• air fuel ratio -hotpepper- ♂ (325 bytes) () 09/23/2019 postreply 18:00:58