my bone stock 02 lb7 has been doggin for power, it starts and runs fine ( a little ruff idle) and is still getting 17.8 mpg, but it just doesnt want to get up and go at all. randomly it will juet run like a champ never know how long it will last .. a day,week,or 5mileswhen it runs good its real smooth quiet and powerful you hear the faint whistle of the turbo every time you touch the accellerator and instantly you go, when it runs bad you just hear the engine seems like its alot louder cant hear turbo and if you stomp the accell down it barely moves.anybody have a clue? brand new injects cp3,filter, even pulled tankcould it be a prob in turbo sensor or somthing? im not a mechanic but with the right advise im sure i can fix it. oh ya no smoke at all even when i romp it ??? any info ? thanks

 

did the new cp3 come with a new pressure regulator?

 

Clean the MAF sensor?

 

the cp3 did come with a new regulater, i havent cleaned the maf. or even cheched it dont know exactly where it is ill find out and clean it ,are there many componants to the turbo?does this sound like a turbo prob im dealing with?

 

have you checked the fuel filter for piece of mind?

 

hey thanks for the input ive changed my fuel filter a gozillion times!!!! i did clean tha MAF sensor seemed to help a little saturday i took about a 280 mi trip truck ran pretty good ( not great) but good that was befor i did any thing i had only taken off the intake tubes and manualy turned the turbo propeller ??? been driving it to work this week its better than its been but power band is still weak .on my weekend trip milage was at 18.9 this week 17.1?anyway hope any of this is usefull

 

hey man am i way off with this turbo thing? its intermitten seems like more of an electrical issue huh? i dont know ficm? update? bad batteries? crazy but just dont get it, am i just having some random problem that has not realy been an issue for many if any other dmax owners.

 

do you have any way to monitor things? being able to see what some of the sensors are doing while driving would help you out a lot. this is kind of a hard one with no actual codes set.

 

ya it sucks having no codes! dealer just saya well it runs pretty good cant find any thing wrong with it, do these guys drive duramax trucks at all? today for no reason at all it started runnig rough again, not as bad as it can but still no great response fr om the accellerator plunging it down like 2"!!!! , when things are good a 1/4" to a 1/2" is like a ten mile an hour gain???? at least its not rolling backwards at uphill stops right now.... anyway iwas looking at a programer will this work to monitor sensors and such? like a tech 2 or close? any tips on where to start, should i pay the dealer to diagnose ,or could i get set up and do some of it myself??