Cummins hates rain
#1
#3
OK it started to rain this AM after a long dry spell...It will fall off idle under 30MPH and try to die. It will lose power during regular driving conditions and then surge with small changes to throttle position with sometimes puffs of black smoke...then run like a scalded dog. Then at idle it sounds like it is overfueling and run with a real hard lope. When it initially happened we managed to get it on the laptop and it showed rail pressures that were VERY high during the overfueling at idle..replaced the overflow/overfuel valve and the problem persisted but it went away when it got dry out. When it happens it will throw all sorts of codes to included water in fuel and MAF sensor
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