Question about 2002 GMC Yukon Denali

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2002 gmc yukon, rich fuel code, low fuel pressure @40

Have a Yukon when started idles very rough, revs up to 2K rpm. Idle is up and down up and down, seems to improve as engine heats up. Code reader says 'rich fuel Bank 1 ".Check spark plugs and all bank one plugs were black. bank 2 plugs were ok. Checked the fuel pump pressure @40psi. Will checking the fuel pressure the dial move about 2psi at idle. Is it sing that the pump is gone bad??? What can it be?? Oxygen Sensors???

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  • Anonymous Mar 12, 2014

    low fuel pressure on bank 2

  • Anonymous Mar 17, 2014

    hesitates as accelerating from 1200 RPM to 2000 Rpm

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You may have two oxugen sensors on your yukon. if so the oxygen sensor that controls that bank may be bad. from what you mentioned in your complaint, it sounds like it is the oxygen sensor.

Posted on Dec 24, 2008

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Clean out your idle air control valve. I see this all the time. It gets clogged with carbon and then frees up when the engine get hot. It will throw a code for O2 sensors which are expensive. It is usually on top of the throttle body, 2 bolts 1 connector. Clean out with ether. You may need a whole can, this carbon gets thick.
NO SMOKING-KEEP CHILDREN AWAY.

Posted on Jan 23, 2013

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My yukon did the same thing with no check engine lights, 2k rpm and all, it was the fuel composition sensor which is present on e85 vehicles. 949 from the dealer, found it for 329 gm box and all. good luck

Posted on Dec 16, 2011

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