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Hollow Cat 928S?
I have had a cold high idle problem for a few months now that I cant seem to solve. I have replaced all temp sensors, repaired any vacuum leaks I could find, replaced air flow meter, repaired all ground connections, replaced 02 sensor, and still when the engine is cold it runs a high idle around 1300 to 1500. I let it get to operating temp, even drive it and it still idles high and surges. When I shut the car off, let it sit for around 20 to 30 min, it starts up and runs around 300rpm. with less surge only on decel from 60 to 50mph. I noticed that my cat is hollowed out and have a new one on the way. Until I try to replace it I am wondering what input anyone can give me on hollow cats. It is an 84S Us model. I thought about how a hollow cat would pass more oxygen by the 02 sensor due to more flow and the fact that the cat is not there to keep the 02 hot. Thanks.
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