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01-08-2021, 10:35 PM #1
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99 Merc. 175, 2.5L EFI question on ECU's
Can 150, 175, 200 and 225 ECU's be interchanged on the 2.5L, without other modifications?
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01-10-2021, 10:35 AM #2
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You can do it, but I only recommend going from say a 150 to a 175 ECU. Or a 200 to a 225 ECU. If you put a higher HP, ECU on it will always run richer at all RPM,s. But it will still run. You will mainly notice it at idle more than other speeds.
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01-10-2021, 10:40 AM #3
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Thank You for the info.
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