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  1. #1

    Default hydrocarbons at idle failed

    Hello all, I have a 93 5.7 with 161K on it and it failed emissions for hydrocarbons too high at idle. At 2500 rpm it passed ok. Truck runs pretty good but has only been driven 5-7000 miles in last 5 years. It doesnt run rich or have any odd odors and the cat temp is only 50 deg difference front to rear so it seems to be flowing ok. I know it needs a tune up since it has probably been 7-9 years. Besides the tune-up and timing set, is there anything else I should be checking for? Appreciate any help I get. Thanks

  2. #2
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    Enkeiavalanche's Avatar
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    Default

    Try some Seafoam or something to clean out the motor.. Where in NJ are you?
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  3. #3

    Default

    southern Nj Sicklerville

  4. #4
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    Enkeiavalanche's Avatar
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    Nice I'll be in that area soon on the Wadding River...in Chatsworth
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  5. #5

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    Get some fresh cranberries when you are there

  6. #6
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    Enkeiavalanche's Avatar
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    You bet but they are not out yet.. You should come There is a post about it in the NJ area.. Did you try to clean out the motor?
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  7. #7

    Default

    I haven't tried anything yet just trying to get some responses and see if there is a consensus on some ideas such as the seafoam treatment. I will probably do that first before I do the tune up but I am trying to find out if there are any electrical items like sensors that I should be aware of. I think the o2 sensor is ok because it is fine once it gets off idle. I'm suspecting the tuneup is going to be the biggest cure but just covering my bases

  8. #8

    Default

    once you have done the seafoam i would do a good tune up. personally i would change the 02 sensors. sometimes better safe than sorry

  9. #9

    Default

    Thanks for the reply

  10. #10

    Default

    Tune up first, then check for vacuum leaks.
    Opiewho
    2004 Silverado 2500HD W/T
    6.0L, RWD, Auto w/Towing Package

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