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1996 chevy c1500 5.7l LTFT RUNNING LEAN UNDER LOAD

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here 1996 chevy c1500 5.7l LTFT RUNNING LEAN UNDER LOAD

This topic contains 1 reply, has 2 voices, and was last updated by Nightflyr * Richard Kirshy 8 months ago.

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  • #895847
    Donald Williams
    Donald Williams
    Participant

    ETCG.
    AWESOME SITE, LOVE IT. ON WITH MY ISSUE. I HAVE A 1996 CHEVY C1500, 5.7L VORTEC ENGINE A/T. THIS IS A NEW FACTORY GM MOTOR WITH APPROX 600 MILES ON IT. THE ISSUE I AM HAVING WITH IT IS THE LTFT ARE RUNNING LEN ON BOTH BANKS 12 TO 14% LTFT AND STFT RUNNING FROM -0.8 TO 1.6 % ON BOTH BANKS, O2 SENSORS SEEM TO BE FUNCTIONING AS THEY SHOULD. AT IDLE THE FUEL TRIMS SEEM PRETTY NORMAL EVEN WHEN YOU RAISE THE RPMS. FUEL PUMP IS NEW WITH 62 PSI, i CLEAN THE MAF YESTERDAY AND THE LTFT WERE A BIT LOWER THIS MORNING UNDER LOAD BUT STILL HIGH 10 TO 11 % . MOST ALL OF THE SENSORS ON THIS ENGINE OR NEW AS WELL EXCEPT FOR THE MAF AND THE EGR VALVE. I ALSO HAVE NO CODES CURRENTLY. I RECENTLY HAD A NO START ISSUE WHICH TURNED OUT TO BE JUST A BAD DIST CAP, BUT IT TOOK A BIT TO FIND , WHILE GETTING TO THE BOTTOM OF THAT I DID PULL THE UPPER PELIUM TO INSPECT SPIDER INJECTORS AND FUEL REGULATOR, I DID REPLACE GASKET WITH A NEW ONE I HAD, AND RE TORQUE EVERYTHING TO SPEC . ANYWAY I WOULD APPRECIATE YOUR INSIGHT ON THIS ISSUE. I AM GUESSING IT IS GETTING UN METERED AIR FROM SOMEWHERE. THANKS.

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  • #895849
    Nightflyr *
    Richard Kirshy
    Participant

    Might suggest smoking the engine.
    Also check / smoke the EVAP system for leaks.

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