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  1. #1

    Unhappy HELP!!! silverado fuel problems.

    I have a 2000 silverado 1500 with a 5.3. Got it 2 years ago and changed the plugs, wires, and threw a k&n filter into it. A couple weeks ago I was driving home on the interstate and my truck started to choke and sputter. When I hit the gas it would get worse and felt like it was backfiring. After pulling over for 5 mins. I got back on and was fine for about 20 miles till it did it again. Whenever put the gas to the floor it would downshift hard and excellerate to 75 then cruise for awhile and slowly lose power down to about 40mph. When I got it home I checked my wires, cleaned the air intake, and oiled the filter. After I put the filter in it got worse to the point were one day I could limp it to work and the next time it would barely idle in the morning before it died.I replaced one of the front O2 sensors. nothing. I cleaned the maf sensor and replaced the fuel filter and it got better to were I could get round town most the time with the occasional hiccup and backfiring incident( i think oil from the filter clogged the maf???). but on the interstate it will run decent enough to get me around but occasionally it either stumbles and backfires when i stomp on it or it will downshift hard and excellerate hard up to the speed i want. I have scoured the forums looking for answer and think either i need to get new plugs( wires seem fine), new maf, or maybe the fuel pressure regulator. I plan to get the fuel pressure checked tomorrow and have codes on here too. cel has been on and off since first occurance. really hope its not the fuel pump. Any advice would be appreciated.

  2. #2

    Default

    I think you are headed in the right direction. Get the "codes" checked and go from there. It's better than having to pull the fuel pump and not need to. Good luck!


    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    ===============
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  3. #3

    Default

    I'm willing to bet you over oiled the K&N and got oil in your Mass Airflow sensor. This will cause a loss of power and harsh shifting. The oil coats the sensor and it skews the feedback to the computer.

    Clean the sensor with Mass Airflow Cleaner or BrakeKleen. Don't use carb cleaner and do not touch the sensor or blow shop air on it.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  4. #4
    Jr. Apprentice
    Join Date
    Apr 2009
    Location
    Springfield, MO
    Posts
    23

    Default

    I had similar symptoms, except that my car would backfire/stumble EVERY time I floored the gas pedal. Luckily for me, I have a buddy who happens to be a GMC tech with 10 years experience. He replaced the knock sensors and fuel pump, no more problems now.
    1999 Silverado Z71 Extended Cab New body style

  5. #5

    Default

    Cleaned the MAF again and seems to be running alot better. If problems persist I'll probably end up changing it out for a new one. Thanks for thw hwlp.

  6. #6

    Default

    You might be getting fuel into the plugs.... have you noticed if its been missing?
    2005 Silverado
    20'' SS rims
    Stock 4.8 v8 engine
    LS model, not the work truck
    2'' rear-end lowering hangers
    2 12" pioneers 800w max/760w amp

  7. #7

    Cool Help silverado fuel problems

    I think Jimmiee is correct about over oiling you K&N. Try installing your stock type paper filter and clean the MAF and check the airbox for oil.

  8. #8

    Default

    I like AirAid with the spray on, it's hard to over oil it. Maybe you should check out AirAid some time, but it's a good thing i found this out, just in case.
    www.youtube.com/ippielb
    2002 Chevrolet Silverado 1500 z71 1985 Chevrolet Silverado k10 2006 Chevrolet Silverado 2500hd 6.6l LLY Duramax
    6.5" BDS Suspension Lift Edelbrock Carb & Polished Intake Manifold & Valve Covers NAPC Race Transmission & NAPC Built Transfer Case
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    35" Toyo Open Country Mud Terrain on 18" Ion Alloy 179's Headman Long Tube Headers and True Dual Exhaust FASS 150gph Titanium Series Pump
    AirAid Cold Air Intake with K&N Dry Filter & AirAid PowerAid Throttle Body Spacer 2" Suspension Lift 33x12.50r15 Tires EFI Live & AFE Stage 2 Intake
    Pacesetter Long Tube Headers with Cats Gone True Dual Exhaust FlowPro 3.73 Gears Yukon Grizzly Locker with Mag-Hytec Cover & Traction Bars
    NGK Iridium Tips & MSD Ignition Plug Wires Baja Spare Tire Holder 33x13.5 Hankook rt03 18" XD Rims
    Innovate LC-1 Wideband o2 Sensor x2 HID's all around LED taillights and 3rd brake light
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