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Thread: Sewing Machine Sounding in Colder Weather

  1. #1
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    Default Sewing Machine Sounding in Colder Weather

    I've had my 2008 G8 GT for almost 9 years now. Never really noticed it until the last few years, but the engine clearly has a slight sewing-machine sound to it during cold weather startups for the first 5-10 mins.

    Oil level and pressure are good, all 8 quarts of it (ugh!)

    You really only notice it from inside the car, doesn't sound too noticeable from the outside.

    Is this a symptom to impending doom, or just the design of these engines?

    Thanks in advance for the feedback.

  2. #2
    Beyond Help Napalm's Avatar
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    do you have the engine cover off - that knocks down alot of the valve train noise.

    That's part of it. and mines done it for years.

    What you hear in the car on cold days is more than likely piston slap however - this is the skirt of thepiston tapping the lower part of the block as it transitions from going down to going up . It's a deeper sound and I would say you hear it more in the car than you do out of the car.

    mines done that for years too and it's common on the GM lS v8 family of engines with the LS3 probably doing it the worse.

    I would say no doom and it's mostly normal.
    If Guns Kill people, then Spoons Cause Diabetes

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    Beyond Help Napalm's Avatar
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    If you can record it thought that might help as there are other noises that could happen and some of those are bad. LIke a lifter going bad - which is common on the DOD (AFM) series engines like the G8GT has. I have a GT also - I had a lifter die and when it did it threw an engine light but only under half or more throttle - because the valve doesn't open all the way. etc.

    That's a much louder sound and it doesn't go away on it's own.
    If Guns Kill people, then Spoons Cause Diabetes

  4. #4
    Moderator, Retired -Ray-'s Avatar
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    You didn't say how many miles on the engine.
    Rest in Peace Charlie!

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  5. #5
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    Video would be helpful but they do usually have some noise. Also I usually use closer to 9 quarts of oil.

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  6. #6
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    Distant past memories brings up that sewing machine sounds during cold starts is valve train noise related to oil/flow/film characteristics. Might want to research this on Bobistheoilguy forums for what oil characteristics to look for that might minimize this. Can't recall if thinner or thicker cold viscosity would help but given that these days synthetic oils flow better, better find the latest info on minimizing cold startup valve train noise.
    Last edited by WhatNext; 11-16-2018 at 05:29 AM.

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