ok i need help. i am getting 5 miles to the gallon..i am getting service engine light as my egr value is not opening. have change relay and it is still not opening ,than i unplug my pcv and my motor rev up like it can get air the value is new and it seems fine.air filter is new wire new,rotor and dis cap new .the motor start fine and runs pretty soomth my the gas it is using ..the pickup is not there also..it is like it is being helled back..f 150 302..it also has overdrive and with the overdrive turn off the pickup is better.. but gas mileage is still the same

 

What year is the truck?
What codes by number, are you getting?
The Ox sensors, late ignition timing blocked cats could be contributing to the poor fuel milage and performance.
Opening the PCV hose to air will make the idle go high; it's normal action.
You have to check each areas out to be sure and not guess by replaceing parts without some indication of what is faulty.
The EGR valve has a control on it's operation as well as the EGR it'self can be faulty.
Takes some detective work if your going to try the repairs.

 

ford 1990 302 efi ..codes 33 43 .o2 sensors is new i have put 3 new ones in thinking that was my problrem the truck only has the onetiming is right on there is vacluum. new air filter.i have put a new hose on egr value and i can make it open . .any ideas would be great.

 

what recent work have you done to it before it started to act up?

 

noting..boy i wish i did.

 

There is no code 43 for your truck. You might want to check the codes again. Otherwise, double check the vacuum lines associated with your EGR valve for cracks or leaks.

 

check the fuel pressure regulator to get 5mpg
fuel gets pulled by regulator direct into motor
mitchykins

 

At 5 mpg in unloaded conditions, the exhaust would have to dam near be smoking.
I get over 9 pulling combined weight of nearly 12,000 lbs towing.