rich fuel mixture

my 62 is at 310k miles. Burns a half quart of 15-40 every 3500 miles or so. As with any Toyota it starts up rich but seems normal when warmed up. 14-15 mpg highway, exhaust is never smokey or black. Exhaust pipe has black soot forming around it. Most of my driving is highway. Ignore? Diagnose...

I have a 94 80 series with a 1fz-fe and it is just dumping fuel reeks of gas when running backfiring out of the exhaust, super slow, I get around 4 miles per gallon City 7 highway. I've unplugged the O2 sensors, new injectors, fuel pressure regulator, I put a good mass air flow sensor from...

So this low mile 1994 3.0 truck that’s been abused has shown up at my house, dumping fuel and making soot like a diesel. It’s a friends and I’m trying to help him get it going So far what I know: The guy he got it from put a bunch of Chinese/reman parts on it trying to fix something and was...