MY03 3.2 Vacuum leak and wild RKAT numbers

[maz8062]

Hey,

I've been struggling with a vacuum leak on my new-to-me MY03 3.2S

Attached are a couple of Durametric files from an earlier datalog (idle only). The obscured top line is FRA (bank 1)

My guess is the car is runninging lean (adding fuel) but other than a smoke test, I don't know where to look.

Does anything stand out in the attached charts to anyone?

Thanks

[maz8062]

Not a dickie bird from the collective Durametric pros on here.

My main concern is the RKAT numbers, which are at 6.98 (durametric values) while FRA numbers are below 1.

I also have my own 997.1 C2 manual. - RKAT is -3.45 on both banks, so it is trimming fuel while the Boxster is adding fuel, creating a lean condition.

I'm assuming I've a vacuum leak, so I've purchased a smoke test machine and a fuel pressure gauge to measure the numbers at idle and above.

Any suggestions or observations welcome.