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ecarman

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  • From
    San Francisco
  • Porsche Club
    No
  • Present cars
    Boxster 2002 S
  • Future cars
    Carrera 4s
  • Former cars
    1969 VW Beattle

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  1. Hi everyone, My experience with Secondary Air System Readiness on a 2002 Boxster could be useful for some of you guys. I had faults P1128 and P1130 due the to SAI check valve being disconnected from the intake manifold rubber sleeve. Finding the disconnect was easy using flammable CRC brake cleaner and listening for a change in idle speed (tip: don’t light the brake cleaner). After connecting the check valve all faults went away and I took the car through the emissions test drive cycle below RPM: - Start engine, idle cold for approx. 2 min, 10 secs. - Accelerate to 20-30 MPH, Maintain steady speed for approx 3 min, 15 secs. RPM < 3K - Accelerate to 40-60 MPH, Maintain steady speed for approx 15 mins. RPM < 3K - Decelerate and come to a stop. Idle in gear for approx 5 mins. All readiness tests passed except the SAI which showed as incomplete and the EVAP test which failed. I fixed the EVAP test by changing the gas cap whose rubber gasket was cracked from age. Nice cheap fix! I checked that the secondary air pump and valves were OK by activating them using my Durametric. Interestingly, by activating the secondary air pump and valves using the Durametric, I could temporarily make the SAI readiness show as complete, but SAI readiness would return to being incomplete within a couple minutes. The oxygen sensor voltages looked good, unlike what mesutter found on his Boxster, with pre-cats oscillating between 0 to 0.7V, and post-cats flat at around 0.7V. Eight days later after several more drive cycles, and many cold starts, the SAI was still showing as incomplete even though the car had no faults and seemed to be running great. What next? I thought maybe a valve in the secondary air system was gummed up so I again started playing with activating the pump and the valves using the Durametric. This time activating the SAI components during a warm idle made the SAI readiness show as complete and stay complete! I didn’t need to do a full drive cycle. I passed CA smog without problems!
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