Who cares...YOU CALL GM!!! What is this stuff about too much compression? I am no expert but every headgasket I have repaired was LOW in compression. Maybe someone here knows something I don't know.
So your saying a dealership can go in and change anyones warranty records? If so, they surely cannot change GM's internal system.
Sounds like they're saying it has excessive blow-bye. I'd personally pursue this and not just give up. Get their diagnose IN WRITING!
Go to a "referred dealer' in your area someone here has to know a respectable dealer that they have used. PAY them to do a diagnose ,head gasket failure. Then arrange a meeting with the regional rep and the first dealer and shove it you know where.
They have already blocked his power train warranty
They really did or the just tell him they did? I was told by a dealer that mine was void, but it wasn't. If it was me, I would go get my truck right meow!
I understand that but I'm assuming that he would like to get that reversed. From what I'm reading it seems they're saying that the HG blew from excessive mods resulting in causing excessive blow-bye which is causing the gasket (valve-cover) to leak and the tick. No?
Maybe I'm reading it wrong.
So I would go to a dealer even if it was in another state explain to them at MY COST I would like a proper diagnose. Since then you will have a second opinion and the proper diagnose assuming it isn't a HG contact the regional rep showing the original dealer is full of shit.
Make sense? Got to or have to start some where.
Almost need to keep it at that dealer and have a Gm rep come out and look at it were they can not say he did anything else to it. Also they can see the last 10 tune changes in the ecm and the tcm so all they have to do is take a screen shot of that and they can turn him down. But I see he paid for a extra service contract so I would try getting it repaired under that or I would want a full refund on that if they say its no longer any good also.They never changed the valve cover gasket.
Its part of what Gm has all dealer do now they must match up the last 10 calibration. Also just swapping the ECM will not save you they can read the TCM also and void you there from over factory RWTQ output. So you need a spare ECM and TCM.
WOW!!
I wasn't aware of that. GM won't be left in the dark anymore. Goes with the territory that the have built a contender in the performance world and wont be the pit crew mechanic for winning drag races and sled pulls. Can't say I blame them as it's very expensive to fix these trucks.
Wont be long that they will have security devices to discover ECM and TCM removal unless they already do. I guess for the average Joe plug and Play would be an alternative to ECM download calibrations. This has turned out to be a very informative thread, well at-least for me.
One of the reasons I haven't bought a new truck is all the emission crap. I seen a 2010 dually a few weeks back and was very impressed and was thinking about a 2011 . So unless I want to remain stock ,very hard to do, looks like I'll stick with my dinosaur.
Its part of what Gm has all dealer do now they must match up the last 10 calibration. Also just swapping the ECM will not save you they can read the TCM also and void you there from over factory RWTQ output. So you need a spare ECM and TCM.
The last 10 cals only applies to the LMM's (although I've heard rumors that the latest LBZ OS also has this.... the older ones do not... I KNOW the '6128 OS does not). As far as I know, the max Tq value only applies to the 09's with the latest TCM.
For RPOs LLY and LBZ only: Calibration ID Numbers and Verification Numbers from the Vehicle Information screen
• For RPO LMM only: Calibration ID Numbers and Verification Numbers from the Vehicle Information AND the Programming History screen.
• For RPO LMM only: Transmission Data screen containing the Max Transmission Calc Engine Torque parameter.
From TSB #08-06-04-006G:
Code:For RPOs LLY and LBZ only: Calibration ID Numbers and Verification Numbers from the Vehicle Information screen • For RPO LMM only: Calibration ID Numbers and Verification Numbers from the Vehicle Information AND the Programming History screen. • For RPO LMM only: Transmission Data screen containing the Max Transmission Calc Engine Torque parameter.
So basically, the ONLY way to tell on the LLY's & LBZ's without digging deeper into the code (if that would even reveal anything) is if the tuner was still installed. If it was returned 100% to stock, then the CVN's would match whatever GM says they should be.
Now, on the LMM's, you have the programming history that will screw you. You also have the TCM Max Engine Torque PID (Although I'm still not positive if that's for ALL LMM's or just the 09+ with the next gen TCM... I'll have to look at my buddy's 07 LMM).
Sounds to me like they voided the warranty becasue they THINK it was modded, but I doubt thay have any proof.... To make matters worse, it sounds like a crappy diagnosis, and since they blocked his warranty, he can't even get a second opinion at another dealer under warranty... The problem is IF it IS a bad HG, then they can inspect the tops of the pistons after they pull the head, and if they find the "telltale" star pattern, then you're pretty much screwed, and now have a truck that's in pieces....