first please disclose what you are driving. and what country?
year, displacement, number of valves in the head, tranny, 4wd./2wd and number of doors..
thin NFO really helps!
you master cyclinder is bad or any of the slaves are leaking like mad.
look at them if they are not leaking (the slaves) then the master is leaking inside and or outside and or down rear inside of fire wall.
master can can leak inside and only symptom is pedal slowly going to floor.
Bad mpg .
15mph ( US gallons? or Canadian Imperial gallons?)
no matter , 15 mpg is extremely bad.
about 1/2 normal.
top causes:
horrible tuneup state, bad rotor,bad cap, bad wires, bad plugs.
or
car is stuck in limphome mode which usually results in 15mpg.
Limphome can be caused by:
bad EGR circuit.
or blocked up CATCON
or someone rodded out the cat. (bashed its guts out)
or induction air leak.
is your CEL lamp on , KEY ON , NO START ?
yes?
now if above is true then iS CEL lamp OFF while running?
tune up. includes all plastic ignition parts and plugs and new air filter and new gas filter.
a bad gas filter will also wreck a good fuel pump. not cheap. either parts or labor.
any mods to the engine needs to be stated.
any non OEM parts, like custom induction or exhaust?
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