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Thread: RPM Tick

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  1. #1

    Default RPM Tick

    I realize the chevy tick tick has been beat to death. So here is one to make you think a little. I have an 06 silver with 40000 miles on it. Runs strong, pulls great, rides nice. Great vehicle. Recently i have noticed a knock or tick coming in at 2000 to 2500 rpm's. Anything before is fine anything after is fine. Seems to have some kind of a small vibration a tad under 2000 then the tick starts. I was thinking exhaust or something small like that. Took it to dealership, nothing found. They checked for exhaust leaks, checked flywheel, all of the simple stuff. Nothing found. (I am currently out of town so it will go to my hometown dealership when I get home. can't let them rip her open here or I won't get home for a while.) Anyway, strange sound happening at a strange point in the rpm range. You can go down the highway and she purrs like a sweet kitty, you punch it and you get around 2000 to 2500 and tick tick tick. Any thoughts.....

  2. #2

    Default

    Anyone have a thought??

  3. #3
    Master Mechanic
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    Oct 2008
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    Brandon, FLA
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    Default

    Is this a "Tick Tick" like a valve or lifter tick? That type of sound? Could be a lifter that has a issue with pumping up in this RPM range and then it fills and goes to town after? Vibration, hows the harmonic balancer? Does it look like the two halfs are in line with each other? I mean the seal between the two halfs and they are not offset or out of alignment? Well, this is one of those that are great to try and find and diagnose, hope to hear about the outcome.....

    Jeff
    JMoney02

  4. #4
    Jr. Mechanic
    Join Date
    Dec 2008
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    Gettysburg, Pa.
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    Default rpm tick

    Does this happen in neutral, and in every gear, even reverse?

  5. #5

    Default

    I do have it in all gears. Forward and reverse as well as neutral. You put the truck in park, rev to 2 grand and away she goes. Seems like it is pretty mechanical. I would think a lifter we would hear all the time. Even in the higher range. When you are going through the gears it will go through the r's in first pretty fast so you do not get a chance to hear it then when she drops back down to 2nd and you sit her at 2000 to 2500 tick tick tick. I will be heading home here this week and as soon as I get there it will go right to the dealership. They are either going to fix the tick or put a new motor in it. I am not going to put up with the service manager BS. You know we do have rights as owners. It has to be something mechanical and internal. I was under it with the tech at the dealership in the town I am in and I could not find anything loose or anything. Things that make you go hummm..

  6. #6
    Jr. Mechanic
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    Dec 2008
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    Gettysburg, Pa.
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    103

    Default gm tick

    Check the belt for separation of plys or a flap. You would probably hear a belt problem at any RPM but you never know with centifugal forces, its worth a quick check.

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