For folks who are interested, there is now a borescope photo of the cylinder bore damage that has been caused by excessive piston to bore clearance and the resulting piston slap at the http://www.gmpistonslap.cjb.net . There is also a .wav sound file available as well. Again, the people on that web site are not talking about a little bit of light clatter on cold start-up that goes away upon warm up. The only problem is that these engines (for the most part) are fairly quiet on the lot, progressing to a light cold start clatter as a few miles accrue and then some gradually keep getting worse. The particular borescope photo was from the #8 cylinder on a 2001 8.1 Liter engine with 14K miles. Good luck everybody!

 

To the linked site owners: I have seen this site and the photos and heard the noise. Let me start with this. The photo sucks and doesn't tell me a thing. It looks more like shadow caused by the camera feed line. If that were vertical scaring, wouldn't it be more evident and scuff the hone marks of the cylinder? Break down the engine and get some pictures we can see what it is the pic is of. I suggest you get better pics. And for the recording, How do we know that is not a cold engine? The recording quality sounds like an 8 track tape ( FYI: that predated a cassete tape). I agree there is a problem, or how else could this be such an issue. But if that is the fuel you have to fight this fire, your gonna loose. I suggest you get someone to fund a proper research program and get better examples, then maybe I jump on this band wagon. BTW, my truck doesn't make this noise.

<small>[ April 15, 2002, 12:01 PM: Message edited by: Fast4.8 ]</small>

 

Same here....picture sucks as does the recording.

 

While I agree that you have every right in the world to feel whatever way you want, your posts (this not being the first I've read) are very biased and express your personal refelctions of a problem you describe without a responding party or counterarguement.
I'm NOT contesting your problem or its validity but your very hostile tone and very editorialized version of documents. I'm not saying you shouldn't post but you should be more true to your intentions. You seem to express concern in your posts for the general consumer but when you read your site, you sound like an angry 10 year old "shouting and ranting about." You generalize your impressions as being those of ALL you spoken to and I assure you this is not the case.
This makes me feel as if you are merely acting out, or lashing out for that matter, in personal retribution.
If this is your intention, to contaminate others who may not have your alleged problem, to make others feel the same hatred you seem to express for members of the GM staff who may have played little or no role in your current problem, to sympathize with your problem, then I truely believe you will not suceed in that goal as your own contradictiory expressions will reaveal your vendictive nature.
Like I said, YOU have every right to feel the way you do and no one can take that from you. You have every right to post your opinions and your evidence, but expect them to be scrutinized and evaluated by each person and not taken as fact for the mere sake you were able to post them on the internet.
Good luck with your venture and empathize with your dedication.

Richard

 

Did you notice this is at LS1.com, FSC.com and here? The guy is a newbie at all three sites.

 

Yeah, he has tried other sites, different names, been there, seen that, have the "T" shirt <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />

 

Let's not attack the person, let's attack the problem. Please give more valid information regarding your problem. The info contained in the website is low quality and not prooven.

 

I noticed the ONLY site he didn't re-post this was GM-Trucks.com.

He started his anti-GM campaign awhile ago and continues to post his campaign everywhere. I think Oxidizer said it best. You aren't winning any friends to your cause.

Most of us realize that there is an issue with the "cold start knock" problem. Most of us though go through the appropriate channels to get it rectified. Instead, you'd rather ****, moan, rant and complain and go over everyone at GM's head right to the CEO to try and get your problem resolved (which it isn't).

If you'd simply go to your dealer, have them put a new engine in, all would be good. If it starts to do it again, TAKE IT BACK and have the motor replaced AGAIN! This is why you have a 3yr/36,000 mile warranty! Also, if it is noted that you have had problems of such a significant nature, chances are, they'd waive the 3yr/36k limits.

I had this done on my Blazer. I had numerous problems with it starting two hours after it was delivered. After contacting Chevy customer service, explaining to them my situation, giving them all the case numbers I had in GM's system and all the service records of the vehicle, the truck was permanantly placed under warranty. No harm, no foul. I was curteous with Chevy customer service, they took care of me! I didn't need to make a website and peddle my "anti-GM" campaign in order to get them to fix the problem.

Tact and dimplomacy go a lot further!

 

The day after I took ownership of my 2001 2500HD 6.0L we noticed the knock. My wife started it in the garage and my heart missed a beat of two when I heard the noise from my NEW truck. I went back immediately and talked to the salesman about it and he took me to the service manager. He stated "Oh yah, we get two or three people in here every week with that problem". If I had known there was a "Cold engine knock" problem I would have waited to buy a truck until it was resolved or purchased a different one. The dealer did not help me at all and directed me to BBB. That was not much help either as I ended up with a 6yr 100,000 major guard warranty but I still have "cold engine knock". I have been recording the knock every few weeks and it is definately getting worse and lasting much longer than originally. I was told a fix was in the works by my dealer and then later on given a copy of the TSB stating it is "normal". I hope GM repairs this as it is very aggravating to spend a lot of money buying new so you don't have problems and then ending up with this. Those of you who don't have the knock, I envy you. But don't dismiss the issue for those of us who do - maybe you haven't heard a "knocker" yet but when you do you'll understand our frustration better.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by rfisher7381:
<strong>The day after I took ownership of my 2001 2500HD 6.0L we noticed the knock. My wife started it in the garage and my heart missed a beat of two when I heard the noise from my NEW truck. I went back immediately and talked to the salesman about it and he took me to the service manager. He stated "Oh yah, we get two or three people in here every week with that problem". If I had known there was a "Cold engine knock" problem I would have waited to buy a truck until it was resolved or purchased a different one. The dealer did not help me at all and directed me to BBB. That was not much help either as I ended up with a 6yr 100,000 major guard warranty but I still have "cold engine knock". I have been recording the knock every few weeks and it is definately getting worse and lasting much longer than originally. I was told a fix was in the works by my dealer and then later on given a copy of the TSB stating it is "normal". I hope GM repairs this as it is very aggravating to spend a lot of money buying new so you don't have problems and then ending up with this. Those of you who don't have the knock, I envy you. But don't dismiss the issue for those of us who do - maybe you haven't heard a "knocker" yet but when you do you'll understand our frustration better.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I'm sorry to hear about your problem and I do understand the frustration involved.
I've heard several "knockers", some of them even make 400+rwhp and run 11.xx 1/4 mile times. Engine noise is common, and I have seen several of these motors torn down and replaced or repaired due to other identified problems. But guess what, so do the other 2 big boys on the block. Until someone will do a dyno history that will prove that these engines deterirate over time due to piston slap, I'm happy. Again, I'm not saying the problem doesn't exist, just the link in the post that started this thread looks like a 3rd grade computer class project. That's MY opinion, and I sticking to it.