GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 1 of 2 12 Last Post byLast Post by
Results 1 to 10 of 13
  1. #1

    Default 07 Silverado 5.3L feels sluggish

    My 07 Silverado NBS performance feels like it has gotten sluggish lately. 5.3L all stock except for K&N filter and slightly larger tires. I've put roughly 85k miles on it. Engine fans (electric type) seem to run alot if temp is mid 90's or higher. Any thoughts or suggestions?

  2. #2

    Default

    Quote Originally Posted by mah2496 View Post
    My 07 Silverado NBS performance feels like it has gotten sluggish lately. 5.3L all stock except for K&N filter and slightly larger tires. I've put roughly 85k miles on it. Engine fans (electric type) seem to run alot if temp is mid 90's or higher. Any thoughts or suggestions?


    Went you mean Sluggish.....all the time and/or at certain speeds??.....What size tires did you put on....also what Rear Gears do you have....
    Last edited by 99'HEARTBEAT; 08-24-2010 at 03:17 PM.

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  3. #3

    Default

    The electric fans turn on when the a/c is turned on, so if its in the mid 90's I assume you have the a/c on?? Also what '99Heartbeat ask about tire size and sluggishness.

  4. #4

    Default

    Sluggish more so off the line, especially when it's hot. I'm not interested in racing, but it used to have better pep. 3.42 gears with 285-60 on stock 18 wheels.

  5. #5
    Jr. Engineer hundojoe's Avatar
    Join Date
    Feb 2010
    Location
    Elk River, Minnesota
    Posts
    210

    Default

    Its normal for an engine to get sluggish when it gets hot, heat is the enemy, the more heat you can extract from the engine bay the better you truck will run. Also when you are running the ac not only does the compressor put extra load on the engine the electric fans are also putting an extra load on the alternator which also puts more load on the motor.
    1999 Silverado Regular Cab Short Box
    Black on Black, Line-X sprayed in bed liner
    5.3 with K&N CAI, Texas Speed 220/220 cam with 112 deg LSA
    Texas Speed computer Tune
    American Racing Headers with Cats
    4.11 gears front and back, with Eaton rear posi
    Flowmaster 40series true duals
    16X8 American Racing Nitros with 305/70/16 Goodyear MTR's
    285's in the pic



    If it ain't broke...........Give me a minute!

    Im not completely useless, I can be used as a bad example...

  6. #6

    Default

    OK, you have factory 3.42 gears. The stock tires were most likely 265/70-17's. The 285's tires are taller and so the truck acts like it has 3.23 gears. Also did you reprogram the trucks ecm for the taller tires?

  7. #7

    Default

    The stock tires were actually 265/65-18 (Z71 wheels). Therefore, my stock tires were actually a bit taller than my 285. I have not reprogrammed. Could catalytic converter(s) be bad?

  8. #8
    Sr. Engineer
    Join Date
    Jun 2009
    Location
    San Diego, CA
    Posts
    426

    Default

    Clean your MAF.
    Black Bear Performance- Custom Tuning Solutions

    Authorized EFILive and MAGNACHARGER seller

  9. #9

    Default

    What do you use to clean the MAF?

  10. #10

    Default

    You can get a can of CRC MAF Sensor cleaner at autozone, it's about $7. Also get a can of CRC Throttle Body & Air Intake cleaner as well. Your throttle body could have some major build up of carbon since you have already put 85k miles on an '07. I recently cleaned the throttle body and MAF sensor and my truck runs 100% better and I only have 80,6XX on my '03.
    2003 Silverado 2500HD 6.0L Vortec V8
    2" Body Lift
    3" Suspension Lift
    Skyjacker Hydro 7000 Shocks
    Skyjacker Steering Stabilizer
    35" Tires with 20" American Racing Rims
    Velocity Cold Air Intake
    Billet Throttle Body Spacer
    BBK Performance Headers
    MBRP Cat-Back Exhaust System
    DiabloSport Predator- Soon to be tuned by Diablew

    "Soon to be leveling-kit"

Page 1 of 2 12 Last Post byLast Post by

Similar Threads

  1. 2010 Silverado WOT Sluggish
    By Gatorfan71 in forum Performance & Fuel
    Replies: 5
    Last: 07-16-2010, 07:41 PM
  2. Feels like a warped rotor, but . . .
    By ryed in forum Lifted & Offroad Suspension
    Replies: 1
    Last: 06-15-2010, 11:14 PM
  3. sway bar bushings, car feels all over the place
    By 07cobaltss/sc in forum Lifted & Offroad Suspension
    Replies: 4
    Last: 01-02-2010, 12:48 AM
  4. Auto sector feels pinch of credit crunch
    By ChevyFan in forum The Coffee Shop ~ Chit Chat
    Replies: 0
    Last: 04-02-2008, 04:40 PM
  5. sluggish website?
    By ChevyFan in forum Announcements & Feedback
    Replies: 4
    Last: 06-05-2007, 02:53 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •