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  1. #1

    Default Poor performance upon starting

    my girlfriend has a 2002 Yukon. Occasionally will crank but then sputter for a bit until it warms up. Dealers can't seem to always duplicate so cannot diagnose. Any ideas???

  2. #2
    Sr. Mechanic 00chevy53's Avatar
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    clean your throttle body and clean your throttle positioning sensor... if you dont know where the sensor is its on the right side of the throttle body as you look when you open the hood
    2000 single cab short bed 1500 w/ 6.0 vortec maxx swap from a 2006 2500, custom intake, slotted brakes, shorty headers, 8mm wires, electric fan, strait piped, 4.5 inch lift, asp pulleys, true dual through body exhaust, built trans w/ shift kit, custom tune by efi alchemy...320rwhp

  3. #3
    Master Mechanic silverhobey's Avatar
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    guy at my work had something similar happen to his vehicle----had something to do with heat sensor until engine gets to temperature ???---not sure if you could mention this to your mechanic or not. Also, could be worn out igntion coil ----good luck

  4. #4

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    thank you sir. will do that

  5. #5

    Default

    x2 on what 00chevy53 said. Cleaning the MAF sensor and Throttle body will do wonders. My truck did the same thing and would actually stall as I was coming to a stop, bought some cleaner for both parts and my truck hasn't done it since. My truck had over 80K miles at that time and the throttle body was caked with crud.
    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"

  6. #6
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    murdog94's Avatar
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    Be sure to clean the Idle Air Control control valve passage on the TB as well.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  7. #7

    Default

    Yes, start with the cleaning as recommended by the previous users. If that does not fix the problem, then it very well could be the engine coolant temperature sensor for the computer, which are usually fairly cheap to replace as well.

    edit: and a scanner should easily tell you if temp sensor is working properly.
    Last edited by dualdj1; 11-16-2010 at 08:58 AM.
    1986 Chevy G20 Tow Rig - 5.7 TBI conversion
    1978 Mustang II King Cobra Road Racer - Holley 650, MSD 6AL, 5 speed, 10 point Roll Cage, 9" posi, fuel cell, custom interior.

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