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Moderator
Join Date: Feb 2004
Location: DFW (Hurst), Texas
Posts: 4,730
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Try swapping the #3 coil with another, ditto injectors. If you truly have eliminated plugs, coils and injectors then ECU would be my next try. On E36 cars bad solder on ECU boards was possible.
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HPDE Instructor (BMW / PCA / Apex)
Here: 1997 M3/4 Byzanz/Magma ~ 2006 Yamaha R6 ~ 1997 R1100RT ~ 1991 Ford F-150 5.8l ~ 2015 Kia Optima
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