Pls Help! Lack of power mid rpms - possible misfire

[blsfrs]

Originally Posted by 02maher

So yes I definitely had some vacuum leak somewhere but not only… one of the direct injectors came out faulty and not spraying properly.

I learnt that the engine uses sometimes more the port and sometimes more the direct injectors depending on the rpms and engine load, so I guess when I was soliciting the engine beyond a certain load at a certain rpm, it starts to use the DI and that’s why the misfire and shaking happen there.

I’m getting a new injector soon and will keep this post updated for future reference.

Please post once you get it back together.

[02maher]

Originally Posted by blsfrs

Please post once you get it back together.

That’s it! My problem is resolved, it’s like I have a new car. Now I can fully enjoy my car. I replaced the faulty injector with a new one after I cleaned everything, put a new silicone gasket for the intake and voilà. I did the job myself and it took me practically 10 hours.

The only thing I still don’t understand is why the ECM (untuned) didn’t detect the misfire… and when it was tuned with the OFT then it detected the misfire.