2002 Chevy Suburban Codes P0131 P0171 P0300

MICXIE

MEMBER
2002 CHEVROLET SUBURBAN
V8
4WD
AUTOMATIC
137,000 MILES

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

3 Replies

5.3LITERV8

MEMBER
2 POSTS

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!

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Thursday, July 15th, 2010 AT 10:54 PM

MICXIE

MEMBER
14 POSTS

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

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Friday, July 16th, 2010 AT 5:57 AM

5.3LITERV8

MEMBER
2 POSTS

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!

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Friday, July 16th, 2010 AT 6:01 PM