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Hi. I’ve just installed g4+ on Audi TT on first start up lambda was 0.520 so I tried lowering main fuel - injector pulse 1 unit at a time from 20 to 17 this got me to 0.660 but 16 15 ect made the lambda fall back down again. Is there any other setting that need adjusting other than injector pulse width that could cause lambda to be so low?

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6 minutes ago, Kev Sheridan said:

so I tried lowering main fuel - injector pulse 1 unit at a time from 20 to 17 this got me to 0.660 but 16 15 ect made the lambda fall back down again.

What is this "injector pulse 1" setting are you adjusting?  It should be Master fuel.  What lambda device do you have and is it connected to the ECU or just standalone?

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