My 2004 Santa Fe recently is getting terrible fuel consumption literally needle keeps going down. no leaks filter is clean and tire pressure is correct oil change every 3000 miles. Any suggestions
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P0300 is Random Misfire. 01, 03 and 05 narrows it down to those cylinders.
Clean throttle body and MAF, you may have carbon flaking off and fouling plugs. You could try taking it for a good thrash down the highway for an hour.
The Fuel Economy of the 2004 Hyundai Santa Fe is listed as being 16 mpg in the city and 22 mpg on the highway.---------------------------------------------------------------------------------- Digiprog3 Odometer Correction Tool
fuel consumption higher driving in the city because you are stopping and accelerating causing more fuel get car in motion.to help fuel consumption problem some, replace air filter,keep check on tire pressure.low tire pressure will cause fuel consumption.
REPLACE AIR FILTER.CLEAN FUEL INJECTORS,CHECK TIRE PRESSURE.LOW TIRE PRESSURE WILL CAUSE LOT OF FUEL CONSUMPTION.CITY DRIVING WILL BURN LOT MORE GAS,STOPPING VECHICLE THEN GOING WILL CAUSE MORE GAS BURNING, YOU NEED POWER AND FUEL TO GET VECHICLE IN MOTION,BY IT BEING HOT WEATHER, USING AIR CONDITIONING TO KEEP COOL INSIDE WILL CAUSE MORE FUEL CONSUMPTION.
Just helped a friend fix this exact same issue on his 2004 hyundai santa fe. Replaced the purge control valve - a $39 part, even from the dealer. Had to get our hands dirty, but it took literally one single hour to replace the part. Filled it up immediately afterward and no more starting problems. Part is located directly behind the manifold - top, rear of the engine compartment - just between the engine
Checked brakes for possible wheel(s) dragging, as well as tire pressures up to max recommended pressure, and observe if tire wear unusual, signifying improper alignment? Any difference in engine oil grade used?
It could be several things . One i would have the fuel pressure tested , you may have a bad fuel pump. Two a bad coil pack , if they are going bad they can heat up and fail.Three the ECM or CPU may have gone bad or going bad . Witch would explane after sitting will start again.I would start with the fuel system making sure you have fuel pressure . It could also be the fuel filter that could explane low fuel pressure .
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