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International Automotive Technicians Network
Re: IC MXFDT 4300 low power
Posted to HD/Fleet Forum on 6/23/2020

Have you checked your Cold Air induction system for any leaks? 20 PSI seems too low. Also the base engine condition, ie compression (rings), Fueling (injector condition) and turbo vane condition could also be holding it back from preforming to full boost.

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