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Originally Posted by Isaac Zachary
I wonder if adding propane via the EGR circuit would be helpful. Maybe put a very small propane carb (e.g. lawnmower carb) on it?
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I guess it would not be of much help.
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Of course NOx would be worse.
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Most likely non-methane hydrocarbons would increase, while NOx would eventually decrease, unless the ECM would trim down the stock fuel injection flow.
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Which NOx could be offset via water injection.
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Had it been strictly to offset NOx, water injection would've been a more likely approach.