Merry new years,
2000 4x4 4.7L V8. when towing, after about 100 miles, check engine comes on. when read by cheapy code reader, it states lean condition in a cylinder (I'll have to go re-read it if it is critical to get advice). the truck has 133,000+ miles on it. I bought it with 127k. haven't driven the truck without a trailer all that far, mostly about 30 mile to work occasionally (60 mile round trips). 31x1050 tires on 15 inch rims, wind resistance means I cant pull 5th gear in wind or grade, without losing speed. In a draft it is good enough, lol.What you guys figure the most likely cause? need injector cleaning, or new injectors, or someone tampering with ECU or before I got it? Throttle body mod? New not K&N but same idea air filter.
The trailer is a 16ft featherlite, with hardly anything in it but a makeshift bunkbeds, a family size cooler, gas & tools, and slight camping gear, and 1 dirtbike. (it is half the weight of any dirt bike you imagined when you read this, unless for some reason you imagined a modern Trials bike, it weighs less than 150lbs ready to ride.)
thanks