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  1. #21

    Default Ignition Parts

    I was wondering if my 2004 suburban 5.3L has individual coils or just the one? I was wanting to increase the performance/mileage with some aftermarket ignition stuff. Just wondering. thanks!

  2. #22

    Default

    Quote Originally Posted by ippielb View Post
    Well, I've seen a lot of people asking this question, and I would like to share a few findings I've found. And maybe people can share their findings. I've done the following to my truck to attempt to get better fuel mileage.

    Cold Air Intake, Throttle Body Spacer, New Spark Plugs, New Spark Plug Wires, Dual Exhaust, Fuel Filter, Synthetic Oils, and getting my EVAP Valve and compressor cleaned.

    I've noticed a huge increase in my gas mileage! But it all went to crap when i put bigger tires on. I've also found a few other reasons how to increase your gas mileage.

    How big on the tires did you go? Did you correct the speedo, and if you went noticeably larger on the tires a gear swap will help get some back. Obviously the increased weight and rolling resistance will hurt one way or the other. I maybe only lost .5mpg after a 6 inch lift and 35"s. Going 3.73 to 4.10 helped since I do mostly highway driving, where the 4.56 would give more grunt but would have probably hurt a little on my daily route since it would have increased the RPM's by a few hundred.
    David
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    http://www.gmtruckclub.com/forum/sho...Silverado-2500
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  3. #23

    Default

    Quote Originally Posted by cpowindle View Post
    I was wondering if my 2004 suburban 5.3L has individual coils or just the one? I was wanting to increase the performance/mileage with some aftermarket ignition stuff. Just wondering. thanks!

    I believe you have individual coil packs, atleast my 04 does
    David
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    http://www.gmtruckclub.com/forum/sho...Silverado-2500
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  4. #24

    Default

    Quote Originally Posted by Tydeone View Post
    Don't forget the gas.
    I have seen a 10% increase in milage by switching brands of gas. I was regularly using Speedway(Marathon) gas and getting 15 mpg in my '93 Silverado. Our local Shell station became very price competitive so I tried a few tankfulls of Shell gas. To my surprise I gained a consistant 1.5 mpg, up to 16.5.

    It pays to experiment a little.
    I bet that Shell is ethanol free.

  5. #25
    Sr. Mechanic chevyman2004's Avatar
    Join Date
    Jul 2009
    Location
    southwest Minnesota
    Posts
    194

    Default

    they say that a tonneau cover can increase gas mileage by 10%

    2004 Chevy Silverado 2500HD:sign0011:
    6.0L Vortec
    Magnaflow 4" Dual Exhaust
    Leveling Kit
    Westin step bars
    Penda Skid Resistor bed liner
    dark blue metallic
    Bak Industries plastic bed rail caps
    Alpine 6 1/2" SPS-600 in front
    Alpine 6 1/2" SPG-17C2 in rear
    Bilstein HD Shocks front and rear
    Goodyear Wrangler Duratracs LT265/75/R16
    Access Lorado Roll-up soft tonneau cover

  6. #26

    Default fuel mileage

    those are all good things to practice, thanks
    :great:Semper FI

    2008 Vortec 6.0 LT Z-71
    2500 HD "BIG BOY" Truck
    Stealth Grey Metallic
    Volant Cold Air Intake
    Line X Bed liner
    265 75 R16 Michelin LTX M/S2 ORWl
    Chrome step bars
    Fog lights
    3M clear shield hood protector
    Putco over sized boss locker side rails 2 1/2"
    Truxedo Low Pro QT Tonneau Cover

  7. #27

    Default

    Quote Originally Posted by hunky View Post
    I bet that Shell is ethanol free.
    Not sure on Ethanol. If it's in the Midwest I think they put ethanol in everything

    Look for top tier fuels. Those are your best choices. I run Shell whenever possible and have had the best results with it. I seldom put additives in my tank.

    http://www.toptiergas.com/retailers.html
    2006 Chevy Silverado, 5.3L, Z71, Extended Cab. Tow Mule.
    2002 Chevy Corvette Z06, 5.7L, Slightly Modded. Tow Payload.
    2005 Craftsman Riding Mower, 17hp, light mods.

  8. #28
    Legend 2ToNe04's Avatar
    Join Date
    Apr 2009
    Location
    Fresno California
    Posts
    1,030
    Blog Entries
    1

    Default

    Quote Originally Posted by hmaster77 View Post
    drafting can increase ur mil;eage a ton but is extremely dangerous and is hard to do in a truck.
    All you have to do is cruise directly behind an 18 wheeler and the 18 wheeler takes all the wind resistance but if u drive a truck u have to get liike 5 feet behind the truck in doing this i have gotten my instantaneos gas mileage to stay at 30 mpg bbut this was only on the highway

    your asking to chip all your paint. lol

    30 mpg lol

    2004 4.8| Custom Paint| Tint| De-badged| Shaved Tailgate| Rollpan| Smoked Tails| Color Matched| Lowered 5/8| Suede Interior| Color Matched Interior| Indash & TVs| Mids-Lows & 2 12" CVRs| 500 & 1100 Interfires| Soundeadener| Outlaw CAI| Magnaflow|
    Future Mods: 6.0 LQ4/9| Bags|

  9. #29

    Default

    Quote Originally Posted by hunky View Post
    I bet that Shell is ethanol free.

    Nope, all of our gas around here is 10%.

    The big diference is Shell blends the ethanol with their 87 octane regular which results in 89 octane at the pump whereas Speedway(MAP) uses a sub octane blendstock to start with and end up with 87 octane at the pump.
    John


    '04 K1500 Silverado Z71
    '04 Impala
    ----------------------------
    previously

    '78 C10
    '84 C10
    '88 Corsica
    '92 Lumina
    '93 C1500 Silverado

  10. #30

    Default

    Great write up! Ive got a CAI and it so far has increased my gas mileage by 1.5mpg

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