really poor fuel economy please help!

OH ok making changes, this weekend when it warms up some get a strong flash/light look for the leak at rear/end shine light up inside brake/drum hub,look for leak on inside of brake/shoe? they might have fixed wheel/seal an not refilled rear/end,look behind U/joints for leaks, top of axel U have a vent CK. it for leak. Idel eng. up and spray soap all over hoses cooler and if outside temp. is hi. not idel. can save 1 MI. per gal. on my truck, maybe yours too?

 

good deal buying the hoses parts an putting them on will save, your clamps should have springs inside the screw to be the org. ones, buy spray to clean up every thing, then you will see leaks before they cause more prob.

 

I think you are talking about the wastegate actuator. This will dump boost to keep your turbo from overboosting.

 

Waiting an update dude. Let us know if you ever found out the prblem

 

Did your mechanic pressure test the CAC as well?

 

I have exactly same problem, my truck is verry much like yours,2005 century s60 14L with 13spd and just rebuilt and put on back on the road on oct4th 2013 first 17k miles did good mpg was 6.3 to 7.2After first oil change it dropped down all the way to 3.57mpg So far every thing I could think about cousing this problem checks out fine. Day b4 yesterday I visit detroit dealer in penn. They claim they find out the problem and fixed A-Egr elbow gasket leaking. B-Exhaust manifold slip joint gasket leaking. C-Delta p sensor replaced. D-air in the fuel system which I didn't agreeBut after all this not much change. So far i drove 630m with 10k in the box and about 65mph and I have seeing upto 5.4mpg and after 6hrs of idle 4.94mpgTonight I will be picking up 44k lbs load just to c how much change will happen