2002 Chevy Suburban Codes P0131 P0171 P0300

2002 CHEVROLET SUBURBAN
137,000 MILES • V8 • 4WD • AUTOMATIC
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MICXIE
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Engine runs rough at idle. Any other time while moving engine runs great. Strong smell of gas and using a lot of fuel. gas milage was 12 mpg now its like 6 or 7 mpg. Pulled Codes P0171 and P0300 after driving about 50 miles new Code came up P0131.. All 4 spark plugs on drivers side and the oxygen sensor no.1 upstream on drivers side was coated with black soot, Cleaned everything, put them all back, Car drove good for 4 miles then all Codes came back. Vacumn checked good, All coils on that side have a strong spark. Cleaned MAP MAF and Throttle body. Still missing at idle only. Still using a lot of gas and have a strong gas odor. End of tailpipe is blackened. HELP
Mar 28, 2010 at 9:10 AM
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5.3LITERV8
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hey! my suburban did the exact same thing. we put 400 dollars in it for bad reasons. i put a FUEL PRESSURE REGULATOR in mine and it has been running fine for 2 years! just try it i guarentee it will work!
Jul 15, 2010 at 10:54 PM
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MICXIE
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Thanks a lot My problem has been solved/ It was the 02 sensor no 1 upstream drivers side Runs beautiful .Everything is fine Thanks again for your comeback
Mike
Jul 16, 2010 at 5:57 AM
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5.3LITERV8
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glad to hear it worked out! i should have tried that too. its been running fine but if anything happens i will try an 02 censor. thanks for your input as well.. go chevy!!
Jul 16, 2010 at 6:01 PM