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Yes it will. Your having to depress the fuel pedal more and force more fuel into the engine. Eventually the engine will just stop running because the exhaust cannot get out.
Start with making sure the tire pressure is at the max in all four tires. Change the air filter if needed. Typically the O2 sensors will cause bad fuel mileage if they go bad. The Check engine light should indicate when one is faulty. If the check engine light is not on you might want to have your front end alignment checked. Most people are not aware of how much front end alignment affects fuel economy. It can be out of adjustment a very small amount and will change the fuel mileage drastically.
Hi please check all fuel injectors for leakage or malfunction. do check if fuel pump cuts out when ignition is turned off, possible fuel pump relay malfunction.
indicates a problem injector
use a couple of cans of quality injector cleaner
the code refers to a problem in the fuel trim parameters
to put simply
the ECM is programmed to run with an average air fuel mixture
however there is a lower limit and an upper limit in that setting
Now the ECM does a tune up every 60 seconds so when it reads a consistent throttle setting and road speed it sets new limits for the mixture
this is evident by an increased economy on long drives and a reduction in economy in city driving
when those parameters are exceeded that is code p 1171
how to fix
possible causes are--
intake air leakage
exhaust system leakage
low/high fuel pressure
faulty heated oxygen sensor (HO2S)
leaking injectors
faulty mass air flow (MAF) sensor
sump oil level too high
What I would be looking at is the HO2S as it's primary function is to read the exhaust gas composition and report to the ECM which adjusts the mixture (fuel trim)
it is in the exhaust manifold/s before the cat converters
next check is the fuel pressures ( 45-65 psi) and faulty injectors ( injector cleaner )
better check the fuel pressure regulator on the rail, ive seem them leak into the vacuum hose that connects to the intake, then check for leaking injectors, good luck
WITH AGE OF YOUR CAR THERE R A LOT OF FACTORS ONE A TUNE UP SINCE ITS RESPONSIBLE FOR CONVERTING FUEL, AND THE EXHUAST SYSTEM ON HYUNDAIS MUST BE INTACT FOR PROPER GAS MILEAGE, BUT MOST IMPORTANT WHAT R THE CONDITION OF UR TIRES. OLD TIRES CONTRIBUTE THE MOST TO POOR FUEL CONSUMTION.
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