Stock LMM turbo question

[FarmDiesel22]

I got an 09 LMM and took the Dpf off and put a tune in it this summer and I was seeing a boost spike a 37 and dropping off to about 34-35 at wot. Now lately when I get on it i am seeing a boost spike at 29 and dropping off to 25 at wot. I am trying to figure out what happened that would cause this. Do I have a boost leak or a leak in an exhaust manifold or up pipe? Or is my turbo taking a shit on me? I haven't had time to try and figure out the problem so I figure I would ask on here to figure out where to start looking.

 

[LBZrcks]

What tunes/tunning are you running? program any other tunes in it since you last saw the higher boost?

 

[FarmDiesel22]

I am running one of duramaxtuner's tunes. No I haven't changed a thing.

 

[Bako_Dmax]

How are you monitoring boost? There should be no reason for that tune to call for 37lbs of boost on a stock turbo.

 

[FarmDiesel22]

autometer gauge

 

[Bako_Dmax]

Have you talked to your tuner about it? Seems there is something not right with the tune.

Some other thoughts: hole in your boost line losing pressure somewhere, dirty fuel filter.

 

[wikdlmm]

37? That is false boost. it reads that bc u still have the egr on there

 

[FarmDiesel22]

I have the egr blocked if that matters

 

[LWATSON]

37? That is false boost. it reads that bc u still have the egr on there

What do you mean by false boost? With or without the egr the preasure has to be there if the guage indicates it.

 

[FarmDiesel22]

bump

 

[LWATSON]

Have you changed your fuel filter. I would do that first to rule it out. I doubt its in your tuning if it was runing fine before with the same tune. Just a shot in the dark, but check your air filter also and inspect your boost tube boots for rips, they can be small and open up under boost.

 

[FarmDiesel22]

I ll check the boots. I haven had time lately with farming and finishing up school. But the truck only has 8000 miles on it so I wouldn't think it is the filters but Ill take a look.

 

[Jon]

Remote

I have a 09 GMC and it seems to have a mind of its own , what I mean is Its cold here about 15 degrees here last night and the night before. anyway I make sure when I shut off the truck at night I leave the heater on full blast so the next morning when I remote start it I want it to start warming right away, also have plugged in overnight. but when I go out to check it, or to go the heater is not running but the seat heaters are on which I did not turn the seat warmers on the night before??? Then other times it seems to work the way I want it to but it has not been that cold i the past.. It almost seems like the truck has a sensor built in to determine how cold it is and maybe telling the heater fans not to come on until it reaches a certin temp so it does not sit there and blow cold air ..Make sense or is this possible?? Thanks

 

[Jon]

Sorry I meant to post a new thread