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  1. #1

    Default Knocking and pinging

    its knocking and pinging on 93 octane,and a fresh tune up ...I NEED HELP!!!ITS A 91 4.3 silverado...135xxx miles...

  2. #2
    Jr. Engineer hundojoe's Avatar
    Join Date
    Feb 2010
    Location
    Elk River, Minnesota
    Posts
    210

    Default

    Was it doing this before the tune up? If not double check the firing order.
    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...

  3. #3

    Default

    yea man, this was why i did the tune up ..

  4. #4
    Jr. Engineer hundojoe's Avatar
    Join Date
    Feb 2010
    Location
    Elk River, Minnesota
    Posts
    210

    Default

    ok just asking, gotta start some where, have you checked the fuel pressure?
    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...

  5. #5

    Default ??

    thanx man ..I HAVNT CHECKED THE FUEL PRSSR ,,SHOULD I JUS CHANGE OUT THE FILTER...??

  6. #6
    Jr. Engineer hundojoe's Avatar
    Join Date
    Feb 2010
    Location
    Elk River, Minnesota
    Posts
    210

    Default

    A filter change never hurts, but it still helps to know what your fuel pressure is at before, so you can see what its at after. Also check the wiring at the knock sensor, I do know that the fuel injection spider can be a problem on the motors, but im not sure it that will cause pinging and knocking.
    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...

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