I have an 1998 outback wagon that isn’t running right. Background: A while ago it was running badly and had a code for knock sensor. I replaced the sensor and it seemed better. Shortly after that it began to running poorly again, it felt like how it was running when the knock sensor was bad; overall lack of power. So I replace the plugs and wires which helped some. The plugs while looking worn out were not oil fouled or carbon fouled.

 

This is where I am now. No check engine light and just a general lack of power. I also have a 99 outback wagon and the difference is definitely noticeable. I know this is a very vague question but if any of you have any ideas about where and how to start looking into this I would much appreciate it.

We are going to need more than that - compression test? Check that the injectors are fireing? Good spark on all cylinders?

 

Has the engine had a valve adjustment at the required 105k interval?

 

GD