986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - MY03 3.2 Vacuum leak and wild RKAT numbers

maz8062 · 06-13-2025, 11:11 AM

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.

06-13-2025, 11:11 AM	#2
maz8062 Registered User Join Date: Jun 2025 Location: London, UK Posts: 5	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.