Question about 2001 Hyundai XG300
I have the same car.Mine was doing the exact same thing and it turned out to be the alternator going bad.After I replaced the alternator I have not had a problem since.Don't know if this helps you .Good luck.
Posted on Sep 12, 2009
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Posted on Jan 02, 2017
SOURCE: What are the descriptions for
P0171 - System too Lean (Bank 1)
P0174 - System too Lean (Bank 2)
They have to do with fueling the engine. Usually when a car is running a less-than-optimal fuel mixture, it's traceable to O2 sensors, mass airflow sensor, or sometimes a coolant temperature sensor. These all have a direct effect on the fuel mixture. If your O2 sensors have been in the car for more than 60k miles, I'd change them first, as they have the biggest impact on fuel mixture. I don't know what year your car is, but if it's 95 or older, there is only one sensor per bank of cylinders. If it's 96 or newer, you'll have four - two before the catalytic converters, and two after them. The ones you'd want to change are the pre-cat O2 sensors, closest to the engine. These are used for determining fuel mixture. The post-cat O2 sensors are there for monitoring the cats' efficiency.
Posted on Aug 03, 2008
Just check all vacuum lnes, especially pcv hoses and if all of that is ok, it's a good chance your intake spacer is leaking. Actually the gaskets under the upper intake leak, but, it's a good idea to replace the whole spacer
Posted on Dec 04, 2008
SOURCE: 1999 ford windstar 3.8 eng miss
remove the plenum take out injectors have them rebuilt change your plugs should clearup problem.
ps if you have blowby problem could come back in a few months of driving.
Posted on Jun 01, 2009
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