Quote Originally Posted by Azz86 View Post
No they didn't do anything like this. The previous owner did replace the primary O2 sensor though. It does look pretty new. Not sure exactly how old it is. I would guess around 2 years (I have the service records somewhere). I have considered replacing it but I think they are around $300. Bit of a waste if it doesn't solve the problem I guess.

Do you think it would be worth a try?
Checking the long & short term trims vs actual mixtures is basic stuff - Need a decent scan tool & accurate lambda meter.
There are a variety of things that can be the cause so targeting though testing so that actual problem can be solved rather than throwing money at a guess.
& tuning the car before the issue is solved may also be wasting money.
The K-pro can be good a diagnostic tool is you have access to one though.
- Check knock sensor output & function
- Check long & short term fuel trims
- Check Vtc cam command vs cam actual (early stages of vtc sprocket failure also sound like pinging)
Other things that may help are new fuel filter & cleaned injectors, but that also may make no difference.
Once the problem is correctly identified though, it can then be solved & after that, yeah, a tune would be worth it.

Hope that helps