84 2L diesel excessive fuel consumption (1 Viewer)

Joined
Aug 15, 2009
Messages
465
Location
Nelson, BC, Canada
I recently bought an 84 2L diesel 4x4 ext cab. Its quite hard on fuel compared to other 1 and 2 "L" trucks I have driven and owned, including a 2LT.
Its also smoking black more than it should.
Fuel filter is new along with air filter. Compression is great., breaks are not dragging. Injectors and pump have never been done. Truck has 250,000km on it.
What can I look for to improve mileage? Could the pump timing be out? im thinking maybe a little too advance with all the black smoke....
 

jynx

Turd Herder
SILVER Star
Joined
Apr 24, 2010
Messages
9,281
Location
Eagleville, TN
Pump timing was going to be my guess but just a guess since I don't own any diesel Toyota's myself. My dad has an "L" truck and after he had his pump rebuilt he had to turn it down some because it was acting similar to what you are mentioning.
 
Joined
Jan 10, 2006
Messages
666
Location
Raymore
Turn the fuel screw back (counter clockwise) a quarter turn.. Excessive fueling will cause poor mpg. Fuel screw is right above the stop solenoid.

Remember, doing this you will experience a slight loss in power.

Timing should be performed with a dial indicator or a tach n time. If you were to adjust I would maybe retard it a tad.. Old nozzles in the injectors will "pop" or inject sooner which essentially advance the injection cycle.

Good luck!
 
Joined
May 29, 2012
Messages
11
If it's bellowing out smoke all the time, fuel problem, otherwise underload could be a turbo problem. What kind of KMs do you get per tank?
 

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