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Originally Posted by Bruce Colby
Can't get A/F on the Motronic twinspark because there's no O2 Sensor. It seems there wasn't much unleaded fuel in Europe in the mid to late 80's when the 75 TS was in production. Hence, Motronic wo/O2 sensor feedback to control A/F. I assume it's a nonaddaptive 4.x Motronic system. Interesting isn't it? I wonder if the ECU is coded to take O2 sensor input but that it's just not used on the European engines of that time frame. Any thoughts?
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I Have never even heard about a 75 TS without a O2 sensor. And I've seen quite a few... 
There is a jumper (looks like a relay socket) in the harness near the ECU where you can set the engine up for different octane ratings and the legend goes that if you remove this jumper the engine disregards the O2 sensor and runs the engine as if it was without a cat.
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Mats Strandberg
GTV 2000 -77 [URL=http://www.alfapower.nu/gallery/gtv]Pics[/URL] <= These are picture links you know...
75 Turbo -87 *sold* [URL=http://www.alfapower.nu/gallery/75T-Modificata]Pics[/URL] <=
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