Titojeep
Registered User
Gotta reach out again to my fellow IDI experts. My engine has a rough / weird running at 900 RPM. Sort of feels like missing a cylinder, but don't think it is. No excess smoke at any time during operation. Actually feels like something off balance. Motor & Truck shake but at soon as I go above or below 900 RPM, it's gone whether I'm driving or not. Here's some refresher background info. 93 F350 DRW IDI non turbo. 276000 on the clock, fuel system (low pressure / high pressure / injectors only have 60k. Idles fine and smooth. Cranks fine. (no long period of time and great cold weather cranking). Motor was pampered the first part of it's life. Original injectors and pump lasted until 199K and even then the only reason it was replaced was due to smoking when cruising at 65mph or off and on during idling and poor fuel mileage. Have had no issues at all until I noticed this weird operation about a month or two ago. I don't drive the truck very often. I did noticed that I'm having a small leak at the heater probe on the filter, but that seems to go away when the motor is warm. By small leak, I literally mean a small observation of moist fuel, not dripping. I did question air penetration, but I would assume this was cause rough engine operation specifically at idle, and or difficulty in starting???? Other than that the truck runs flawless and still get's decent fuel mileage (avg 15mpg). Any advice or suggestions would greatly appreciated.