Aluxes Posted March 15, 2015 Share Posted March 15, 2015 I changed the 2.2 ECU in my 97 OBS, to a 97 2.5 ECU. Works great with all my mods, but Im getting a small backfire out the exhaust when shift gears. It is intermittent. Is this ok? Is this from the 2.5 Ecu, or from something else? What can I do to fix it? Link to comment Share on other sites More sharing options...
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