i have a 91 ef hatch with dpfi and i am getting very shitty gas milage like twenty miles a gallon thats terrible for a honda

 

Because you have a heavy foot or a bad pcv valve or a dirty filter or a gas leak or someone is stealing gas from your car or ....Vague questions lead to vague answers.

 

sadly its true... you have to be more specific... and besides have you done a tune up lately? Or how about the whole switching between only one injector to two... I suffer from that problem... and while I am thinking about that... When I rev it to a specific rpm (I don't have a tach) it sputters when the second injector turns on. I cleaned out the iacv and I am unsure where to go next so I am thinking maybe fuel filter maybe?

 

by filter u mean air filter? mine i brand new, or fuel filter? should i just buy a new fuel filter and pvc valve btw how much does a pvc vale cost?

 

if your air filter is new check your plugs and wires, oil, air pressure in your tires ect.

 

what is the iacv? i think i found something on that but cant remeber

 

wires and plugs seem to be good

 

on the right side of the of the the dpfi connected by 1 electrical switch and 2 hoses. Just use carb cleaner.

 

ok i will try that tommorrow when i get off work thanks

 

no prob

 

check tire pressure
change oil
change air filter
change fuel filter
change oil filter
change pvc valve
clean intake and injectors (2)
redo timing belt (make sure its all TDC)
check ignition timing (make sure its 16*)
new cap and rotor
new plugs (gapped to correct size)
New plug wires (make sure in right firing order)
new o2 sensor(s).
Run sea foam

i bet after than you will get 30+mpg.