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For what its worth, I get similar results. Bank 2 is always very steady and hardly changes cold to hot, bank 1, on the other hand, goes from about -6.3 cold, to -5.5 hot. My understanding is that when you have variations at idle over the short term then that could be a sign the IMSB is failing.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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