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It causes a diverter valve to switch air pump air into the exhaust stream to cool the converter depending on the mixture needed. I had to replace the converter because the flanges were rusted badly. If your air pump system is not functional or removed, the converter will likely only work partially correct. Frankly I don't think it's that important, but I was told it was illegal to remove them.
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Bryan
86 Hilux LE longbed
Other Toyotas  : 79 Corona DLX sedan (Mint green), 89 Corolla DX sedan (wine), 88 Camry V6 LE sedan (blk), 86 Hilux std bed (wine), 82 Celica GT hatchback (bwn), 78 Celica GT coupe (slvr), 76 Corolla SR-5 coupe (wht)
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