I need to pull my knock sensor and then do a run to make sure it's not what's causing my fueling issues. I think it may be "over active" or "noisy" and I want to unplug it and do a run and see if I'm still running rich AFRs. However, I couldn't get to it this AM when I tried it, there were too many hoses and wires in the way (I couldn't even see it). Is there a tricky way to get to it? Do I need to get under the car and take all the under-tray stuff off -- can it be reached from underneath?

 

You can reach up and unplug it from underneath. Be VERY careful as it is brittle and the slightest pressure will break it. I recommend a warm engine block (not hot) so it unplugs with ease.

 

I would depin it at the ECM side instead of unplugging the sensor.

 

I thought about that, but pulling it under the car felt simpler to me.


It ended up not fixing the problem. I did a compression check. 145 PSI hot all 4 cylinders. Looks like it's time for a ring job.

 

145 all 4 cylinders. That's good you are looking for consistent numbers not higher numbers.

 

Yeah but at 145 on all cylinders, he's getting almost HALF of the compression it left the factory with..... That's not really good IMO.

Edit: I would however do a leak down test as well to make sure there aren't any issues with any valves, though with consistent numbers like that it would seem like it's definitely the rings.

 

Add a small cap of oil to each cylinder and do another comp check if it shoots up I think it's 240 it's ring issues