GM Engine Knock
Total of 4 samples on my oil. Each and every one of them have high copper content. All other materials appear to be fine, at or below averages. Time to take it to the dealer with the sample reports. Maybe now they can find why it has piston slap on startup?...
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Ray T.
Tom
Walter (Gator)
PS. Obyone was generous enbough to scan his oil sample report and e-mail it to me. His copper content was similar.
Tom
Ill probably do it next month when i am due for a change just for the heck of it.
I have a come and go knock. Havent heard it since february. Truck runs fine.
I will let you know after i get it done what the results are
Ryan
We are NOT going to start this nonsense up again.
This is certainly a valid topic for discussion. Stick to it.
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First, The service manager looked at my reports and was visibly concerned and puzzeled. He is sending it to the regioal field engineer today and we will see what HE has to say about all of the metal.
Second, I had two other concerns to be addressed.
1. The intermediate steering shaft needed to be lubed. Done, fixed, no problem.
2. On acceleration (particualrly one on-ramp to the freeway.) I will get "Pinging" (Spark Knock) from 3900 rpm through 4300 rpm at wide open throttle.
Now get this answer the "technician" came back with...
"Your fuel filter is plugged solid and you need to run higher octane gas. These 4x4 motors are High compression motors and they need higher octane gas."
At this point I wasn't sure whether to laugh my [non-permissible content removed] off or tell this guy he was an idiot. So I asked him and the service writer(her), "Then why does the manual state use 87 octane gas?" Their response was that "Those manuals are written for all vehicles and these "higher comression 4x4 motors need higher octane gas."
Okay?
Now I didn't just fall off of the turnip truck and I enjoy putting something back "in your face" from time to time, I figure that I will do as they say and bring it back and ask "Now what Einstein?"
Then take a nice walk back to the service manager and ask what kind of monkeys these two are.
Side note, another service writer was there when I picked my truck up and he just laughed at the "diagnosis."
Fuel filter has been replaced and 93 octane gas has been introduced, guess what, no change....
I agree, where do the dealership's find some of these moron's. The service writers took a class in theatrics we know but what excuse does the ASA/GM Certified mechanic have to make such fool statements ?? I didn't know the 4x4 Silverado's had "high compression" engines I feel slighted by GM. Should we tell GM about these high compression engines their handing out to 4x4 owners??? they may be able to start tacking on another $1000 and call it an option pkg. ROFLMAO
Keep us laugh'in.............
Ray T.
My 2001 GMC 2500hd 6.0 4x4 has a engine knock! the noise is gradually getting worse! The BBB has set up a date to arbitrate my case next week.
My Question is! Can anyone help? Let me know if you have gone thruogh the process and if you were successful in having GMC buy back your vehicle?
Our what can I expect? Since the dealer won't even touch the problem I am wondering if they even know what the real problem is!
Thank you in advance for any help!
You can reach us at a012887@dellepro.com
Louder, performance losses? Could you please clarify thanks
Ryan
My 8.1 started knocking at about 3k or 4k miles and lasted about 20 sec.At 20k mi it was louder and lasted 45-55 sec.Now with warmer weather an22k mi it lasts about 30 sec.
I did the BBB thing and they seemed anxious for me to settle with GM by accepting the extended warrenty(I did,reluctantly) BBBs position seemed to be that as long as it runs and drives OK the knock is just a nuisence and if GM is willing to stand behind it with a warrenty I should be satisfied.
My position,on the other hand; it already has a problem they're not willing to fix.
kip
At times it would hesitate on start up as if something has to let loose in order to start.
GMC has no problem with fixing the annoying problems else where on the truck! So why are they so against fixing the engine in a timely manner!
Thanks for your Qustions!
I sure am glad that GM will fix his truck under its original warranty. WHAT!!! GM will not fix knocking engines!!!! ???/
What are GM owners supposed to do? Buy a new GM knocker to replace their original knocker? GM has already said that they will not fix knocking engines. - because for GM engines this is normal!!!.
If the BBB is buying it,surely it must be true.
kip
I'm curious - when did it become "normal" for engines to knock? Has GM produced knockers long enough and often enough that this is their new standard - knocking engines?
Wow!
This simple fact should not surprise new Chev owners.
Will the knock damage the engine? It certainly cannot be good for it, and it probably adversely affects its performance. But the clincher is only SOME of the pistons knock. If knocking was normal, wouldn't they ALL knock? Shouldn't all eight pistons operate in the same manner? Why the "rogue" piston?
I think it's a dark day in America when people plunk $30K for a new truck and are told that knocking is normal and that it's a nuisance. What does that say? It's normal to be annoyed? Sure, for a $3K used beater, but not a $30K new truck.
kip
"it'll pull my 7700lb boat while carrying a 1200lb camper,but hey,how 'bout them Tundras!"
But hey, how 'bout them 4.6 F-150s, 4.8 Silverados or them 4.7 Dodges? I guess you feel the Tundra is the only truck here up for the task? Let's not let emotion get in the way of reason, here.
Since GM said there was no "business case" for giving me an extended warranty, I decided there was no "personal case" for continuing to own a GM vehicle. I traded my Sierra for a 2002 Mazda B4000. No knocks and no other problems.
The fight with GM on these knockers is far from over! I now have 29k and still have the knock for 1 minute during cold start, in fact after camping last weekend and towing my camper the first start up after towing, the knock was LOUDER then the past, but I guess that's normal.................and I just won the Mega Millions Lottery! LOL
Ray T.
kip
Everhart, Glad none of your GM products "knock" and that justifies my position to our GM Coroporate bozo's as well as my case to NY State Attorney General, if it's "normal" then why don't they all do it!
Stay tuned for this one, it's not gonna go away for GM but rather bite them pretty damn hard when their smoke and mirrors show is exposed.
Ray T.
Quote: "The problems are covered by the warranty, substantially reduce the vehicle's use, value or safety to the consumer, and are not caused by abuse of the vehicle."
So:
1) Substantially reduce the vehicle's USE: Does not really, in this case, at least YET (Y-our E-ligible T-oo)--
2) Substantially reduce the vehicle's SAFETY: Does not really, in this case--
3) Substantially reduce the vehicle's VALUE: Bingo! That's the kicker.
If you have taken the advice of BBM at gmpistonslap.com, then some of you have already purchased or have attempted to obtain several written vehicle appraisals on your knocker from ASE-certified mechanics/appraisers.
Have the appraiser diagnose the defect (piston slap) and he'll write it up using NADA's values minus the cost of an engine replacement-- specifically (this is important), because of severe piston slap on (whichever side or # cylinder) in the engine.
Hope this helps. Good luck.
Ray T.
Cheers
I don't know anyone who has won an arbitration over knocking at BBB. I know several that have lost. Did they have the right evidence? I don't know. I'm simply saying that most people might be bringing knocking cars to arbitration which, although they make noise, the arbitrator has nothing but his own opinion to decide whether it reduces value.
The arbitrators are not technicians. Some are not lawyers. GM has the right to preclude a BBB-appointed independent technician at the arbitration and have done so in my case. The technicians that they do appoint do not assess value, nor do they opine at the hearing as to any damage that knocking may, or may not cause.
The onus is upon us to either bring an ASE certified guy in, or at least his statement. The arbitrator will accept statements as he can request verification. They are, however, not easy to obtain. The only statement that matters, according to law, is a value statement. It's only money.
I do know that much. My arbitration is in the middle of June. It's been a long road and one which I would have hoped to avoid.
I do not have the engine knock, and at idle when I first start my engine my oil pressure gauge reads about 60 psi.
2001, 5.3L, Mobile 5W-30 and PF59 filter.
My boss came in today and since I had mentioned this problem to him he said he had noticed the cold start knock. He has a NY State issued fleet vehicle, 2002 Suburban w/6.0L engine and only 5k miles. So as you can see GM has STILL NOT RESOLVED THIS DESIGN FLAW 3 years after it reared it's ugly head.
To be continued............
Ray T.
-- Don
It's like driving a music box that I can control with the gas pedal. Maybe, if I own it long enough, I can get it to play some Led Zepplin.
"It's been a long time since I've Knock and rolled."
Hey .... " they say the heart of knock and roll is the beat .. in " and from what I've heard I be ... lieve them. Well guys ... don't Knock your brains out on this one, good times are ahead.
After all this time, it makes me realize what a useless bunch of no-good LXXX's and ThXXXX'S that GM realy is, putting good people through such BS.
Anyway, I hear from good sources that local engine-builders are replacing pistons for some of the area GM dealers--on the "hush--hush". Shhhhhh.... Don't tell anybody we fixed it. We wouldn't want all the other customers/chumps to find out. Word is, that GM went through several attempts at the new piston design but have not told anybody about it. Now that's normal, isn't it.
-David
GM was trying to tell folks thier engines were knocking because of carbon build-up and as you stated ,these vehicles are new.GM was soaking the pistons (in the engine) as a cure.It actually worked for a few hundred miles,then the knock came back.It seems to me this was another stall tactic and I'm sure there are a lot of people with knocking '99s whose warrenty is expired.
I wonder what was in that "piston soak",Teflon?
kip
http://www.teleweb.net/mgdvhman/Trucks66/tocproto.htm
It aint pretty....
kip
NoMore..... Oh what the hell keep on keep'in on! Does GM know their passing out melodic knockers and not charging for it??? Boy did they miss the boat on that option LOL! Here's one straight from the dictionary to describe your musical GipM melody: aka Vortec..."a rhythmic succession of single tones organized as an aesthetic whole"
ROFLMAO............
Ray T.