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GM ENGINE KNOCK
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So that's the end of the story for now, until some auto mag, Consumer Reports or Big Brother steps in to confront GM on this "knock issue".
Ray T.
If it is component only, they are handing out basic gaurd like it was candy.
Remember that the GMCAC number is an Outsourced help line. These are not GM employees
But paid phone operators that know squat about the vehicle you own...
Walter (Gator36)
So much for it being normal though, they obviously know somethings wrong if their starting to give these componet warranties out like candy, anyone who complains seems to get one now. I would think there would be a break point somewhere so as to have a recall issued but who knows what that will take. I may send in a complaint to NHTSA but not sure they would be the proper people to notify on this one, anybody else have any suggestions so GM doesn't get away with this fiasco??
Ray T.
Ray T.
Pretty much on par with the other 2 samples. 21000 miles worth of documentation
on the oil analysis. Every time the copper is high and Tin is slightly over the industry
average.
So here I am at the dealership (wifes new car) and I see the service manager that I have a good rapport with. He asks me about my truck and how it is doing and I mention
the engine knock is getting worse. (Glazed over look) I then mention that I have been sending samples out for the last 13,000 miles and every time the copper is high (2-3 times the average) He is visibly surprised and asks me to bring my truck in along with the reports. (another dealer has given me the "Standard" GM line on the knock)
While it was hard to hear him over some noise, he mentioned that some of the bearings (mains)
are mostly bronze. He had to run as he was being paged. I plan on bringing my truck in next week.
So today I decide to get some stats from the lab that has done the analysis. I call Blackstone labs to talk with them half expecting to get next to no information. To my surprise they get the lab technician that actually did the sampling. He had a copy of my history in front of him and we had a nice long conversation about my motor and similar motors.
This is a brief synopsis of what I learned.
1. If the copper is from the factory fill oil, it should have been out of the engine long before my last sampling. This is of concern.
2. Aluminum is a little high and may be of concern, still not above average.
3. The average that they list on the report is based upon 192 different engines of the same make and model that have had oil sampled. So this is a Vortec 5.3L Specific average.
4. The average is also based upon a 7,100 mile average oil life. That is the average sample has been through 7,100 miles.
5. This lab does oil samples for all makes and models of engines. They may have a person call here an there regarding an engine that has a knock. One here for a Honda, One there for a Toyota..... But there have been a few GM engine owners with complaints. Specifically he remembers at least five people in the last year or two. This is statistically important as there is a definite pattern.
Who knows what this information will do for anyone, but it just may help to get some action.
We will see what the dealer has to say. I will say this I am impressed with the knowledge and customer service of Blackstone Labs and will definitely send them my business.
Walter Howey (Gator36)
Hey at least is gives you something to worry about.
and they think they'll be rid of you, little do they know! LOL
Ray T.
Ray T.
Swoosh Man
Ray T.
just do the required maintenance (oil changes etc)
I plan on mine lasting that long also. I probably will have a new one but will keep this one also
I've been using Mobile 5W-30 conventional oil and the PF59 AC/Delco filters since my truck had 500 miles on it, and it has been knock-free since day 1. Currently have 10,565 miles on it. Not to say that my oil or filter is the fix, just making a comment about what I use.
I have an occasional knock.
Gm even gave me a 5 yr 100K warranty
As Ryan stated I also got the GM letter for extended engine warranty. Truck used mostly weekends for trips to Home Depot/Lowes or towing 18ft travel trailer for outings.
I still love this truck!
Ray T.
don't know if its a coincidence or what, but at my last oil changed, I switched from Mobil1 to Royal Purple synthetic and my engine knock has almost totally gone away. my '00 2500 with 6.0l now has 37,000 miles - the oil change to RP was done at 34,800. The noise can still be heard on very cold mornings, but is much quieter and lasts only a few seconds, whereas before it clattered pretty good for up to a minute.
don't know if the RP oil has anything to do with it, but thought I would pass on the news. Also, have noticed a gradual, verifiable increase in MPG since the switch to RP.
-- Don
BTW, whenever I notice a little knocking in my 2k 6.0L 2500, I just put in on the highway and blow the soot out of it for a few miles. Knock has disappeared every time. Usually shows up when I have been doing a lot of stop and go traffic driving for several days without any highway driving. All in all, really good truck.
thanks, wade
Wadeo1.........I have somewhat the same truck as you. It doesn't surprise me that with one call to GMCS you were offered the extended component warranty, the key point was that you had documented it at your dealers. GM is giving these extended warranties out like cotton candy at the fair as long as you document at dealers and pitch a fit to them about their product reliabiltiy for the long haul.
What really needs to happen is a class action against them to get the ball rolling but that takes deep pockets a good lawyer w/lots of time.
I posted this article before but go here to see the real deal on this knock issue and why it will be awhile before the design change gets to the general population of GM engines. http://www.c5registry.com./2k2z06/page5.htm
Ray T.
I had an independent engine re-builder isolate the knock to only one (#8) cylinder. Could be slap or wrist pin but not normal, he said. Go to gmpistonslap (from google), join the club and get informed. We all want to believe it's normal folks but face the truth. Your grandma's car never sounded like a diesel and if it did, she'd have known it wasn't normal. My next car will be another NISSAN (Hum... can you say 350Z?). All this "buy American" business has spoiled the domestic manufacturers. We are nothing more than test pilots for them--lemmings driving lemons. Unbelievable... Never Again...
Good Luck and keep us informed.
Ray T.
Please answer: Date and location you received the new motor. Dealer's name perhaps?
Also, did you get a new, "crate" motor or a re-manufactured. Others here have been offered re-manufactured engines. Today the BBB hinted to me that I could get one for my 2001, 7K miles, 5.7 knocker/oil burner. I said no way. More problems down the road & car too new. Maybe if I was past warranty by a couple K miles. If you got a crate engine, how did you confirm it was new? How many miles do you have on the truck now?
Thanks from all of us and if you got a new one, it sounds like you got in "under the wire".
The dealer was Larry Miller of Caldwell, Idaho, can't say enough good things about them.
I just had a meeting with the tech rep reguarding my transmission problems. (See my posting in 2000 GMC Tranny Trouble). I also have a piston slap, started at around 10K, complained about it at 18K. I have also had a low engine oil level light come on 1500 miles after an oil change by the dealer. I also have a pre ignition pinging sound at crusing speeds when the engine is loaded just enough to maintain speed. I live in Soutern New Jersey, no hills here, I run 89 octane, but it'll ping with 94 octane Sonoco. Tech rep told me to run Moble 1 Synth for the piston slap, and that the ping was due to the computer leaning out the mix for fuel economy. Sounds like a bunch of CRAP. I am getting a new driveshaft yoke however. The tech rep did hear my CLUNK in my drive line. I went to the site that nomoregm listed and I will be contacting the AG, my US Senators and Rep, and GM Cust Serv. Any one else heard about the Moble 1 line. Dowes it help?
Good Luck and keep us posted as well as the piston slap web site.
Ray T.
kip
I still called GM customer service and ask about an extended warranty. They called my dealer and then offered me the 5 year 100K plan. WITHOUT GETTING NASTY about it, I said that was not good enough. I only drive about 10K per year and thought a 7 year 70K plan like Dodge is offering was a more fair deal for me. She needed to check with her supervisor - would call me back. 15 minutes latter the phone rang - it was the supervisor - he knew I had purchased 3 new GM trucks in the last 4 years - he new the service records of my trucks, he offered a 6 YEAR 100K plan and said he could not go any longer. I accepted the deal and am waiting for the letter.
NWJETBOAT: What was the DATE you received your new motor. Would you be willing to post your service order(s) leading up to the replacement? You can delete your personal info. It might help some others here and at the gmpistonslap site. Thanks in advance.
MENTOR34: It's likely a "trade secret" if the piston re-design was done. To advertise it would be an admission of guilt by GM. They have already started with the Corvette which is getting new teflon coated pistons--go to: http://www.c5registry.com./2k2z06/page5.htm That technology will eventually trickle down into all engines and be called normal evolution--not a fix. [non-permissible content removed] covered.
For now it seems, if you're not getting the teflon pistons, rings, etc., you have a 1 in 3 chance (or more) of getting an oil-burning slapper like ours. Good luck to all the new buyers. Go to http://www.alldata.com/ It's a TSB site--only the titles are free. This is the TSB found there regarding oil consumpotion on the 6.0 in the 2001 model. It's not posted for the 2002--yet: "01-06-01-011 MAR 01 Engine - Oil Consumption Guidelines". The 5.7 has the wrong rings since 1998 and that's one reason it burns oil (and maybe contributing to the slap--I'm not a tech). In 2002 they started using a new ring pack. Eventually, all us oil-burning knockers will be history. They hope to steer us all off with warranties that don't mean much. NO DICE! I am an American!
Are corporations allowed to cover and misrepresent their mass produced mistakes and bully consumers into accepting it?
Let the people speak.
Tom