1999 LQ4 - Suggestions
My friend is buying a 99 Silverado with the LQ4 6.0L. Does anyone have any suggestions what we can do with it, tune wise, to improve mileage and maybe some responsiveness? Not looking for anything crazy (and I know tuning alone can't really net a ton in a gasser). I know a little about tuning diesels, but I know zip about gas motors.
We haven't gone to pick it up yet, but does anyone know what PCM is in it? Is it the 0411 or something else?
If you want to learn a little bit, get a wideband installed in it, upgrade the to the 02 operating system then upgrade to COS. Setup lean cruise and lean it out under cruise conditions. Have to setup AutoVE before then get some logs on the hwy at light load to lean those cells out.
Its a regular 99-03 512kb LS1 PCM. (Same thing as the 0411 from what Ive heard, might be a different service number but you can run the same OS)
~Erik~
2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.
The service number in the 99 and 00 silverado should be 9354896.... The 12200411 was released in the 01 models in the silverados....
This may be a dumb question, but if we did want a little more "oomph" out of it, could I just load up a 2002 GMC Sierra Denali's cal? The pickups are rated at 300/360, the Sierra Denali is rated at 325/370, both with the LQ4.
Last edited by Cougar281; January 28th, 2010 at 06:26 AM.
Post up the tune and we'll help you modify it...
2008 2WD Ext.Cab Silverado 1500 6.0 V-MAX E38(L76) & T42(4L70E) MAF Only CL Corvette Servo AFE CAI INNOVATIVE LM-2 WBO2
FLASHSCAN V2 & AUTOCAL
Thanks GameOver; I've got the VIN, so I'll see if my Tech2 will flash it's calibration to my 0411 PCM (was out of a 2001 4.3L Blazer); If it will, I'll get it up tonight. If it won't, it probably won't be until next weekend (We're planning on picking it up on the 5th).
Last edited by Cougar281; January 28th, 2010 at 07:34 AM.
Well, the 0411 PCM took it, but my Tech2 erased the serial number and whacked the Seed & Key (set the seed to $FFFF).Is there any way to fix the seed & key?
Attached SHOULD be the stock tune.
Does it have the iron or alloy heads?Originally Posted by Cougar281
Pretty sure Iron heads.
Well worth it if you can get the alloy heads!
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