ktmrfs wrote: a bit of warning. starting with MY 2006, GM can check the ECM to see if a non factory program was ever installed in the truck. even if you remove it, and put back the factory program, the checksum will be stored showing a modified program. can result in a denied warranty claim and a void in power train warranty. In some cases the dealer will need to do the check and send verification to GM showing no modified program was ever installed before they will authorize a warranty power train repair. If your still under your 10 year power train warranty with mileage it's something to consider.
If you go with EFI live, you can buy a new ECM and keep the old ECM with factory programing to swap back in so it doesn't show a non OEM program.
Ford has started doing that with the EcoBoost engines, where one has to "jailbreak" the ECM before it can be used, and dealers are asked to check for non-factory tunes if the engine has issues.
ktmrfs wrote: a bit of warning. starting with MY 2006, GM can check the ECM to see if a non factory program was ever installed in the truck. even if you remove it, and put back the factory program, the checksum will be stored showing a modified program. can result in a denied warranty claim and a void in power train warranty. In some cases the dealer will need to do the check and send verification to GM showing no modified program was ever installed before they will authorize a warranty power train repair. If your still under your 10 year power train warranty with mileage it's something to consider.
If you go with EFI live, you can buy a new ECM and keep the old ECM with factory programing to swap back in so it doesn't show a non OEM program.
The checksum logging started with the new ecm on the 07.5's (LMM). The 07 and earlier (lbz, lly, lb7) don't log it. Even efi-live leaves a footprint on the new ecm. If you have one of the logging ecm trucks, you also have the DPF. Changing the ecm to avoid tuning detection will give you a truck with to many miles per regen. it should regen (and it is logged) about every 300-400 miles, if you have a truck with 70,000 miles and 50 regens they will know somthing it up.
* This post was
edited 05/08/12 04:54pm by christopherglenn *
ktmrfs wrote: a bit of warning. starting with MY 2006, GM can check the ECM to see if a non factory program was ever installed in the truck. even if you remove it, and put back the factory program, the checksum will be stored showing a modified program. can result in a denied warranty claim and a void in power train warranty. In some cases the dealer will need to do the check and send verification to GM showing no modified program was ever installed before they will authorize a warranty power train repair. If your still under your 10 year power train warranty with mileage it's something to consider.
If you go with EFI live, you can buy a new ECM and keep the old ECM with factory programing to swap back in so it doesn't show a non OEM program.
Let the (chip) buyer beware!.
Not a good plan *unless* you are prepared to be your own warranty station.
Sometimes the best "avoidance" strategy (even new ECM) can backfire.
So *when* you are denied warranty work - it's you against "city hall"
to prove it was never chipped.
Louba wrote: On a related subject, how do some of you feel about the benefits of changes to improve the air intake and exhaust on a Duramax?
I have seen several things on the Duramax sites saying that there are no real gains on the intake unless you are in the 550+HP range.
Now, for the exhaust there is a definite benefit there...especially since it appears you have the LLY motor. You can add a 4" exhaust with muffler and help eliminate the overheating that some people see with this motor. It will lower the EGT's some, and they will drop faster if they increased while towing uphill or the motor is working hard. I have added a 4" stainless system on mine and it did not increase the sound at all over stock.
Hope that helps.
KK4PFX
2010 Chaparral 322RLTS
2004 Chevrolet 2500HD D/A CCSB 4x4
Days camped in 2011: 22
Days camped in 2012: 34
Days camped in 2013: 6
Had to replace transmission at 85,000 on my Chevy and when I posted that issue on this forum I received "0" sympathy when I mentioned an installed programmer......
Have an "03" non cat motor, 300HP. Put on the Edge and run in economy only. Gives just enough extra ponys to take that hill. My millage hovers around 12 pulling at 65. 20 at 70 empty. You can see the EGT difference rise if you try to run in higher modes. Probably wouldnt as much with exhaust work. Was going to take the muffler off but not sure I want to put up with the rumble.
One thing I learned when I used to build race engines in a past life, every engine has a horsepower-hour limit. You can get 1,000 HP for 100 hours or 100 HP for 1,000 hours.
Chip does not help, I have a 2003 Duramax and on highway I get 21 mph, but when I tow I get about 10MPG so it is normal. Sometimes I get 11 MPG. IT is a fact of life towing, it is like a huge brick going down the road.
Chevy Silverado 2500HD with Duramax engine and Allison transmission
2002 Sunnybrook 34BWTS with lots of goodies
Pullrite Superglide Hitch, Prodigy brake controller
S and S Co-Travelers and along for the ride is Ketzel the wonder cat.
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