Forester XT “爆震" 問題 國外的解決方案

一直看到關於 forester xt 加速時放生爆震的問題. 想說沒事就看了一下國外是否有相關的問題..
發現國外同樣也有類似的問題. 並且網友也指出了和汽油的純度無關.. 問題被放在turbo 對氣壓的排放上, 有人認為是電腦系統的問題, 提前釋放壓力 造成了"漏氣" 並導致車速上不去,

不過也有一個網友發現了, 汽車內幾個氣閥出現鬆動的問題.. 由於本人沒有該車, 也對引擎研究不夠透徹, 所以只能轉述國外網友的statement, 看能不能幫到台灣的車主.

該網友先發現了"TMIC"(Top Mounted InterCooler)的螺絲很鬆..鬆到誇張..(可能從這裡漏氣). 後來她又在車底發現了 BOV (Blowoff valve 排出閥) 和Turbo air supply 也非常鬆動. 於是他鎖緊了所有的氣閥.. 爆震問題也同時消失了.


個人對技術方面的不是很專業, 也沒有該車, 不過還是希望可以幫他各車友 ^^


"Hi guys, I've been following this same problem on here and ozfoz, the guys on there believe that it's a boost leak as 'dpm' mentioned earlier and the knocking sound is from over fueling because the required air pressure/volume has not been matched to the fuel mixture.

Now I have had this problem happen several times now and was quite skeptical of this solution, but willing to try anything at the moment I decided to give it a go!
When the other guys on ozfoz had pulled the engine cover off to tighten everything up they found that the clamps on the TMIC and were so loose it was a joke, so this is where I started and straight away when I went to start tightening up the clamp on the left side of the TMIC you can suddenly see where all that precious boost was going, I done the left side and same thing again loosey goosey!!!

So I started thinking "what if the fittings close to the turbo are loose?" So five minutes later the bash plate under the car was off and found two more clamps the BOV and the turbo air supply and once again both were loose!

Since doing this I drove the car tonight and I am gob smacked!!!! The car is now alive and feels like it has gained 10-20KW easily and no matter how hard I took off in any mode or 'gear' there was and absolutely no loss of power or knocking, the car is as is the car should be!

Honestly anyone who has had this problem or who hasn't experienced it yet tighten up your intake system!"


http://www.subaruforester.org/vbulletin/f88/weird-noise-when-i-put-foot-down-259138/