Power concern

FamilyWagon

FamilyWagon

New member
Jul 7, 2010
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Western Mass
ouch, thats such a dirty word! i think i will try to get a boost guage and go from there, maybe get something to pressure test my system. Does anyone know if a bullydog Watchdog will display my boost PSI?? i called them and they said they cant garuntee it does... only if my factory ECM supports it.
 
maine04max

maine04max

New member
Dec 11, 2008
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if your truck is an lly it doesnt have either . lly was the first to have a vvt turbo . i wouldnt waste your money on bully stuff get an inexpensive boost gauge from glow shift or something
 
The Neens

The Neens

BFD
Staff member
Aug 10, 2006
4,596
1
36
Monrovia, Ca.
There is a guy in CT that knows about EFI Live tuning...IIRC, his name is Ben....He's a wise-ass, but he knows the Duramax...Might try looking him up...
 
FamilyWagon

FamilyWagon

New member
Jul 7, 2010
69
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0
Western Mass
EFI live would be great... just want truck 100% before any tune... ill have to get in touch to find out how much for a dual tune on a switch
 
DAVe3283

DAVe3283

Heavy & Slow
Sep 3, 2009
3,724
292
83
Boise, ID, USA
If you stop by someone with EFILive, they can do very thorough diagnostics, including checking how much boost you have, by plugging into the diagnostics port. It's not just for tuning :thumb:

The trick is finding someone to diagnose your truck for free (or a case of beer). That can be a bit of a challenge.
 
custom8726

custom8726

Active member
Feb 25, 2008
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Upstate N.Y
Is it blowing any blk smoke on hard acceleration? Reason I ask is usually if you have a blown or leaking boost tube or coupling it will throw some blk smoke even with a stock tune. You can usually hear a wooshing sound from the engine compartment if you have a leak aswell.. If it was a T.C. issue you would definetly be able to feel the motor over powering and pushing through it and would probably trip a code aswell.. My LLY would Powerbrake when I first got it (Stock) but it did not like it:rolleyes: My advice is find someone with EFI or a tech 2 to log it if you can. If not let the dealer check it out.. Without codes or any way to check boost or EGT's its going to be pretty hard to diagnose here.
 
FamilyWagon

FamilyWagon

New member
Jul 7, 2010
69
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Western Mass
from a dead stop floored acceleration i do getr a little trail of black smoke... thought it was normal on a diesel... i do plan on ordering guages in the next couple days... but i will also try to find a leak... gonna try to make my own pressure tester to leak test it with the motor off.
 
DAVe3283

DAVe3283

Heavy & Slow
Sep 3, 2009
3,724
292
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Boise, ID, USA
Yeah, that is the vane position circuit. I would normally look up a wiring diagram or diagnostics table, but my server (or the internet) is down at my house, and I am out of state for a few days.

Hopefully the dealership won't charge much to get it diagnosed.
 
FamilyWagon

FamilyWagon

New member
Jul 7, 2010
69
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0
Western Mass
i cleared the code and after tring to get it to come back it wont... wondering if it was just a hiccup... told the dealer to not order yet (saving $275) gonna run a guage setup to see what i can come up with.
 
FamilyWagon

FamilyWagon

New member
Jul 7, 2010
69
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Western Mass
I just ordered MT edge evo cts ... will hopefully be able to get a better idea of how it is going... Boost loss ect... anyone know if the evolution cts is different than cts with addittude? Guys at alligator said the only difference is the one the fly changes
 
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