'08 LMM Tuners/High Idle - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 19 (permalink) Old 01-06-2010, 04:26 PM Thread Starter
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'08 LMM Tuners/High Idle



I have been looking at tuners and weighing the pro's and con's for a while but have come up with two questions that I can't seem to get a clear answer on before I buy one. One was: can GM tell if you use a tuner on the LMM some say yes others say no (Is there ways to explain away any suspesions they have), and two: the high idle on my truck (for cold weather) kicks in under ten seconds after starting, I think this is way to soon for the high idle to be engaging, maybe after 45 sec - 1 minute but not under 10 sec, can tuners change this? The dealer says they can't yet another guy was in at the same time I was and he says his won't kick in until 4-5 minutes after it's started. What's the deal?



Thanks in advance for your help

BDD
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post #2 of 19 (permalink) Old 01-06-2010, 04:52 PM
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My understanding is that GM can tell if you use most tuners. However, according to what I have read, the only one they can't see is the Banks tuner. It somehow bypasses the ecm and doesn't leave a foot print.
All of that is from my hazy memory if someone knows the real answer I hope they chime in.

As for the high idle I will check mine tonight and report back.

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post #3 of 19 (permalink) Old 01-06-2010, 05:49 PM
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I was told that EFI Live can not be seen either, if its true or not idk?

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post #4 of 19 (permalink) Old 01-07-2010, 02:42 AM
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Nate they can tell that the engine isnt operating within stock parameters, if the engine goes beyond the set RPM they can tell, if more fuel is being injected they can tell, they have the same thing as EFI live, they made the programming, so im guessing they can tell if something has been modified

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post #5 of 19 (permalink) Old 01-07-2010, 03:45 AM
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Any tuning that increases power will be seen on LMM. When they do a warranty service they have to report Calibration ID Numbers and Verification Numbers from the Vehicle Information AND the Programming History screen as well as Transmission Data screen containing the Max Transmission Calc Engine Torque. If that comes up different or higher than stock, no warranty service.

The in-line tuners did not leave tracks because they were intercepting signals between the ECM and motor/FICM and commanding parameters instead of reprogramming the ECM and changing program parameters.

The high idle kicking on in 10 seconds and going to 1000 RPM isn't going to hurt anything. It's only 1000RPM.

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post #6 of 19 (permalink) Old 01-07-2010, 06:16 AM
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Josh even an Inline tuner would show on the logs....

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post #7 of 19 (permalink) Old 01-08-2010, 01:51 AM
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Quote:
Originally Posted by BombDocDiesel View Post
Any tuning that increases power will be seen on LMM. When they do a warranty service they have to report Calibration ID Numbers and Verification Numbers from the Vehicle Information AND the Programming History screen as well as Transmission Data screen containing the Max Transmission Calc Engine Torque. If that comes up different or higher than stock, no warranty service.

The in-line tuners did not leave tracks because they were intercepting signals between the ECM and motor/FICM and commanding parameters instead of reprogramming the ECM and changing program parameters.

The high idle kicking on in 10 seconds and going to 1000 RPM isn't going to hurt anything. It's only 1000RPM.
The trans recording the max torque has nothing to do with how much actual torque the engine is producing. It all has to do with fueling references the ECM and TCM use to adjust how much fuel to use and how much fuel to cut based on driver input via the throttle.

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Originally Posted by BriteWhiteRam View Post
Josh even an Inline tuner would show on the logs....
This is what I've heard too.

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post #8 of 19 (permalink) Old 01-08-2010, 02:25 AM
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I learn something new everyday. I always thought the max calc torque was what the ECM/TCM determined would be the input torque. Stock tuning never results in this being more than factory parameters. With a tuner it can exceed factory parameters.

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post #9 of 19 (permalink) Old 01-08-2010, 06:13 AM
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thats why if you have a truck under warranty and want to save yourself some hassle, just get a backup ECM and run it on your truck periodically, that way it wont look funny if its only been run once a long long time ago

Aaron the Crazy Canuck
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post #10 of 19 (permalink) Old 01-08-2010, 11:10 AM
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FYI... My high idle kicks on at about 1 minute.

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