Engine noise with cold start - Chevy Colorado & GMC Canyon

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Old 10-16-2010, 01:07 PM   #1 (permalink)
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Default Engine noise with cold start

Whats up everyone?
I just recently picked up my colorado, a couple thousand miles ago.. Lately it has been making some noise when I first start it up in the mornings, Im not too machanically inclined towards trucks but sounds like valves to me. Has anyone else experienced this before? Im not too worried Im just wondering if its a sign of valve adjustment soon


its an 07 3.7 with 44K on it
Oil level is good, running synthetic Mobil 1 5-30

thanks!
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Old 10-16-2010, 03:51 PM   #2 (permalink)
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Default Re: Engine noise with cold start

If it lasts about 5 seconds and sounds like if you dragged a chain on concrete its possibly normal. My 2007 3.7 Canyon has done it since ordered new. Theres a chain tensioner in there that is piston operated that looses pressure after sitting and sometimes you will hear that particular sound on start up. Its been argued many times that it isn't normal but there are a lot of us that have it. And the lead mechanic at a GM dealership I used to work at new exactly what I was talking about when I told him. I also use Mobil 1 synthetic but it did it from new with dino oil also. I've mostly tuned the sound out. Have never had a bit of problem. I don't know if this is what your hearing but if it is you'll be fine.
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Old 10-17-2010, 12:04 AM   #3 (permalink)
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Default Re: Engine noise with cold start

Sweet, that makes perfect sense actually, It happens with quite a few bikes as well.
Thanks a lot!
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Old 10-19-2010, 09:07 PM   #4 (permalink)
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Default Re: Engine noise with cold start

I too have have that same noise at cold start up or after sitting awhile. Good to know it's not the valves....but bad that it happens at all. Did they not test these engines at all? How could they let these go with that kind of noise when the other manufacturers don't have this problem? Mine is a 2.9 I4 stick shift. When it's running well, I really like it - variable valve timing on that engine allows for a smooth torque curve. The noise at start up is annoying and embarrassing.
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Old 10-19-2010, 10:00 PM   #5 (permalink)
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Default Re: Engine noise with cold start

yeah, i think its kind of weird too.. most bike engines have spring loaded tensioners.. Kind of a strange thing to let slide from a design point of view, It might not be a problem but it sure as **** has alarm a few people i guess... I wonder how many people have gone into the dealership for this and walked out with a big dent in their wallet from grabbing their ankles!
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Old 10-20-2010, 09:11 AM   #6 (permalink)
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Default Re: Engine noise with cold start

Like I said I've gotten so used to it I don't even notice it most of the time. I think its louder in the winter but mine does it in the summer when its hot also. It just needs to sit all day or over night. But I agree that they should have not had this happening but you will get so you don't notice it now that you know its harmless.
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Old 10-21-2010, 09:29 AM   #7 (permalink)
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Default Re: Engine noise with cold start

I also have had the same noise since new on my truck. Alot (but not all) of the 4 and 5 cylinder engines do this. The dealer acknowledges the noise, but is reluctant to do much about it. I really don't want anyone tearing into my engine since it is fine otherwise.

Funny thing is, I have searched for this issue with the 6 cylinder version of the Atlas engine. (which I assume has the same cam drive setup) I can't seem to find the problem on the 6 cylinder engines. This makes me think it has to do with the balance shaft setup (which isn't on the 6 cylinder version).

My sisters 03 Trailblazer makes NO noise on startup, and any I have heard startup in parking lots don't make the noise either.

Here is a link http://www.355nation.net/forum/engine-d ... knock.html and a reply from bkletke over on 355Nation forum:



Re: 2.9 start up knock

--------------------------------------------------------------------------------

"OK, here's the latest on my start-up noise. After nearly $10,000 in reman engine and additional parts including multiple head replacements (all under warranty), GM is set to officially say that the start-up noise is not detrimental to the engine. Since they have had the truck in the shop off and on for nearly 80 days since the first of April they are prepared to give me two months of truck payments and an extended warranty for probably 3 years/45,000 miles. Officially, they can not explain to me what is causing the problem but do admit that the noise is there and it shouldn't be. They also admit that if this particular truck with only 55K miles were to be traded in, the dealership would send it to auction. They are now telling me that there will be no more repairs. They admit they don't know what is causing the noise and don't know what else to try and so are unwilling to try more ideas (throwing money at it). I've been told that GM specialists have been flown in to work on the problem and many others throughout the nation have been consulted throughout this ordeal.

My argument is: 1. I bought the truck new, paid over $20K and have paid my monthly bills faithfully, 2. I have taken outstanding care of this vehicle, 3. I did not cause the problem, and everyone involved admits it is there and shouldn't be, 4. The value of this particular truck is less than others due to the inability to repair this problem (but don't know how to establish the value loss), 5. I should not have to "eat" the value loss. 6. The replacement of the intake manifold significantly reduced the number of start-up incidents these past 2 weeks.

I have never asked for anything from GM other than to fix the truck. I have never pushed for anything other than to make my truck whole. They admit they are unable to do so. I will be pursuing a negotiated financial settlement. Will probably lose, but will pursue anyway. Any help or advice is appreciated. I apologize for the long post!

BTW - I own 3 Chevy PU's - that is all we own (63 1/2 Ton, 04 Silverado 4X4, and 06 Colorado) GM are you listening? I'm the good customer!"
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Old 08-14-2011, 08:56 AM   #8 (permalink)
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Default GM Quality? I-5 Engine Noise, Dealer Incompetence on Simple Service Work

An outrageous example of poor GM quality. I also have the same I-5 startup engine noise and it's hard to believe that it is said to be "normal" when described by my local GM Chevrolet dealer service manager.

Oh yes, this it is the very same GM dealer that damaged the hubs and rotors on my Tahoe during a simple tire rotation. When I questioned why they did not use a torque wrench for the final tightening they said the "I did not ask for them to use a torque wrench." The front hubs and rotors were soon junk because of this incompetent tech and dealer. I had to pay the bill!

I will not purchase another GM product because of these issues.

GM Chevrolet are you reading this? Outrageous indeed!
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