okay my blazer only get about 11 mpg city an like 15 on highway an it feels as if it lacks power like it hesitates an i was just wounder if i changed the filter if it might help o an i think the filter is the original one an if it is it has 168000 miles on it well im open to suggestions if u guys have any
thanks
Josh

 

when was your last tune up? At 168,000 miles, youd be in dire need of some internal cleaning, plugs, wires, cap and rotor, egr cleaning, throttle body cleaning, and all your driveline fluids..

 

well i did a tune up at like 150000 but i have never changed any fluid i think the tranny was done cause the fluid is red an how sould i go about cleaning the rest of the stuff

 

You have 168k miles on your airfilter??? Yea, I would say to go ahead and spring for a new one...

 

it has a k&n drop in air filter i think thats okay i just washed it yesterday an i put it in there

 

Oh ok. Did this come on suddenly or has it always been that way? Does your temp gauge run just under 200 degrees? A stuck open thermostat will give poor milage. I dont know what kind of tire you are running but I just went from 31" BFG all-terrains to 31" BFG mud-terrains and lost 2 mpg on the highway. MTs have a higher rolling resistance. Right now I am getting 16 - 16.5 mpg hwy. You probably just need to do a tune up (cap, rotor, plugs and wires, fuel filter). Be sure to use ac delco spark plugs.

 

i think it runs just a little over 200 on cold day it dont really get past 200 but thats on days were it like 0 out but as far as tires they are23575r15 and i just did a tune up at about 150000 that helped alil but its been like this since i got it i got it with 132000 on it

 

what about cleaning the egr will that help any cause im sure it needs to be cleand

 

Are your tires properly inflated? Make sure your catalytic converter is not clogged. Clean the MAF sensor... to do this, remove the unit from truck, remove the honeycomb looking screen and throw it away. Spray throttle plate cleaner on the small delicate wire sensors... DO NOT touch them. While your at it, cut up or drill holes in your air box so that air can flow freely into your K&N filter. All that is usually worth about 2 mpg.

 

I never heard of drilling holes in the air box, does it really help?? Does not seem like that would pull that much more air in.