08 lmm keeps going in limp mode after a turbo upgrade and new tuning. Tried a couple new tunes with no luck. No codes at all, just looses power. I think i read something about this in the past? Anyone get it figured out?
LMM 4094vvt limp mode
- Thread starter Bustedknuckles
- Start date
Try re enabling boost and maf dtc's if you turned them off and go from there. I vaguely remembering a little trouble with this but it's been so long I forgot what exactly.
I remember a big thread about it with a couple tuners posting and iirc Danville had found something odd that needed to be tweaked on some trucks.
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If it's slamming the vanes shut(100%) that is turbo limp from underboost code. You will have to log the truck and look at the desired boost vs. map and you will see where it is mis-matched causing the issue. There is a timer in the back ground that if it is under x-amount for a certain time period then it goes into turbo limp and this is normally at a cruising speed and too much boost is being requested.
New tunes fixed it. It was exactly what mark said it would be. The tuner said he put in 68r vane maps instead of standard 4094 maps?
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They only sweep the vanes thru about 70% of the range, keeps boost up better.