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  1. #1

    Default 1995 chev van 350 tbi ping or knocking

    start van runs ok. take off up to 35 mph ok. give gas at pedal to go faster and ping and or knock is noted and lost of power. slow down below 35 and runs good. no check engine light is on and light is ok. pulled intake and put vacuum on egr valve valve holds good vacuum. already replaced timing chain and gear before so this was not the problem. did a tune up when timing chain was replaced. I am thinking the cat is almost stopped up and to much back pressure on accl. is causing the problem. but I don't know. What do you think.

  2. #2

    mfleetwood's Avatar
    Join Date
    Jul 2010
    Denver, CO
    Blog Entries


    Welcome to the Club!!!

    I moved your thread to the correct section of our Forum. This should help in getting your more responses/opinions. Unfortunately, I do not know what the problem(s) could be...

    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

  3. #3

    Join Date
    Jun 2006
    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.


    In the old days a buildup of "carbon gunk" in the combustion chamber could cause knock
    detonation of preignition
    Was it running poorly for some reason -before this started
    Poorly enough so you weren't getting a good burn-?
    Then you fixed something? Maybe intake leak or even exhaust manifold leak plugged TBI
    bad ignition-
    Maybe folks here swear by seafoam to clean combustion chambers
    GM actually makes some GM combustion chamber cleaner
    1998 suburban-
    1/2 ton

    199500 miles

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