I have exhausted all resources and searched this site tirelessly I have yet to find a solution to my lack of mileage. So here goes. I have [/B] 85 22r 4wd, 13600k, 6 in lift with goodyear mtr's, 529 gears locked front and rear. Box bobbed. I have done a FULL tune up. I check comp and its dead nuts on every hole @ 130 psi. I know that is a touch low but not enough to give me the poor mileage. Also I am using a bit of oil it does so on decel. So givin that info I know I need some valve work done. I am not a "mechanic" but not an idiot either. It has been some time since I have gotten inside an engine so not remembering if the valves would affect the compression or not? So if it does than I think that it would bump it up enough as to not be such a problem. Carb looks clean. Truck runs fine just sucks fuel like mad. This time around I got 150 or so miles out of a tank of fuel. So suckin it up pretty good. At one point last summer when I got the truck I got 19.9. At that point it was getting warm and noticed that the fan wasn't engaging so I put a new radiator in and of course the mileage went down a bit but not like this? If I have forgotten anything as far as you all needing more info please ask. I would really like to get this problem resolved. Thanks so much for your time.
Jayson

 

Valves can affect compression. Maybe try a valve adjustment first. It's simpler and cheaper than a head rebuild.

And what gearing are you running? With 35s, you should have at least 5.29 gearing, which will put you back to a close stock feel. But remember, you're also pushing around heavier tires, and your wind resistance is similar to that of a brick. And being lifted doesn't help that at all...

 

5:29's. Yeah not expecting spectacular but def better than I am presently getting. Used to get high teens almost 20. Now 10-12.

 

anybody else!!

 

Idk if you do a proper head rebuild it might compress the bottom end too much, engines like to wear as one, if you increase the head compression it might have a negative affect on the older bottom of the engine. Just what I've heard.

 

13600K Miles?? isn't that like 13,600,000 Miles, a new record





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Just kidding, probably 136,000 actually low for that year truck.

try adjusting your valves, & check your timing.. maybe do a tune up..

 

Not positive what trimming should be at with headers and such or even if it would affect the trimming. Any insight on the trimming? Also about how much should I expect for a valve job? Thanks fellas!