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  1. #1

    Default Ticking sound 4300vortec.

    I have a 98 ZR-2 with the 4300 vortev in it. For the last couple months I have been experiencing a loud ticking sound. It seems to be coming from the back of the engine. I have ruled out the tranny and the transfer case(Its too far forward) It only does it from 1100- 1600rpm. First I thought It was somthing stupid like a loose skid plate. But then I had a buddy keep the engine reved up while I investigated.When Im underneath It sounds like it is in the bell housing, and from the top it sounds like its coming from near the distributor.I ruled out the starter by removing it while the truck was running. then I thought it might be in the distributor so I took the cap and rotor off. The shaft that the rotor screws to is slightly loose but it seems like it is made to be.I dont think it could be rods or lifters or valves because the truck just runs too good and it only does it at that certain rpm. I really hope someone has delt with this before and can help me.

    Please and thank you
    -Ryan (Dayton, OH)

  2. #2
    Sr. Engineer
    Join Date
    May 2009
    Manitowoc, WI


    It could be an exhaust leak from the manifold, that'll make a ticking noise in the general area you're describing without causing any noticeable change in performance.

  3. #3
    Master Mechanic bigdaddy77084's Avatar
    Join Date
    Jan 2010
    Houston, Texas, United States


    Take the fan belt off, or have someone hold the fan from moving. Or tie it off some how. Start you truck and take a piece of tissue paper around the exhaust to check for leaks.
    Check the doughnuts too..
    95 tahoe 2dr 4x4 200,000+ miles

  4. #4


    I will try the thing with the tissue paper. but wouldnt it do it all the time instead of just at a certain rpm? and it only does it when the engine warms up. it is worse when im in motion and not under a load than it is in park.
    Its just so hard to tell exactly where it is coming from with all that stuff crammed under the hood. I miss my 72 Cheyenne. you could stick sombody under the hood and drive around and listen for
    Last edited by Ryan 98 ZR-2; 05-18-2010 at 09:19 PM.

  5. #5


    I figured it out! loose bolts that hold the bell housing onto the motor. thanks for the help fellas.

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