I have a terrible consumption accent Hyundai year 2000 and 1500 CC (14
liter at 100 KM)

I put octane 92 I was replaced my oxygen sensor and electronic sparkle
NGK 1.1 and was clean TPS and MAF and i think not have any leakage in
air system because i detected by water and soap and was clean my air
filter my exhaust pipe is good and not have any bore

in the morning my exhaust pipe output white water

the injector i was clean and detected it's by machine named
ultrasonic


my check lamp is (on) i was detect the fault at the computer.

the fault is

P1123
Long term fuel trim, at idle - mixture too rich

P1128
Long term fuel trim, at increased engine RPM - system too lean

Hyundai on the site saying detect the MAF and TPS sensor


(• Check that the Mass Air Flow (MAF) Sensor (P / N 28164-22610)
operation meets the specifications listed below. If the MAF sensor
output is significantly lower than the reference value (10% or more),
then replace the MAF sensor.)

The TPS must to be 0 at IDLE this is ok and at RPM 2000 to be 3.5, but
I have a 4 and then for 3000 to be 5.1, then I have for 5.5 and in
some time at 3000 RPM is same signal

And MAF
in the idle to be 2.8 this ok and at 2000 RPM to be 6 but in my car
is 7

in the Hyundai site if the output lower the specs. must replace the
MAF but in my case the output is higher.

i hope found the solution for this case.

the fault 1128 detect when i buted the octane 80 with 92