Flashing after H&S

[30 RUM]

I am looking at a truck for a friend. The truck is an 09 Chassis cab with a Duramax deleted. The truck is not fueling well under 2700rpms. I will most likely be retuning this thing with EFI Live. Now for my two part question, is it best to have the thing re-flashed with a Tech-2 and start from scratch. On the fueling issue do you guys know of a sensor that can keep it from fueling down low, it acts like it is a limiter problem. I have logged the truck multiple times and have noticed the truck will only run about 50% load from 1k to about 2700rpms then it will hit 100% load. I have checked desired rail verse actual and it follows right along. One strange thing I did notice is that it is logging 0% torque, I figured that my be do to the H&S programming.

Thnx

Sam

[LB72004]

yes, it is best to start tuning from the base/factory tune. some caned tuners have bad perimeters in them and you dont want any of that getting carried over to your new tune.

for your "limiter" issue, check/clean the MAF sensor.

[30 RUM]

That was pretty much the answer I was expecting. I think that is the next step with this truck, it kinda got thrown in my lap to figure out. The truck does have a new mass air sensor in it and I have logged it and it is showing up to 50lbs on the top end. It is definitely a strange truck to drive, it has absolutely no low end power. I have more experience with Cummins tuning, but all in all something is not adding up with this thing. I'm thinking a Tec-2 Re-flash and then a stock delete tune is the next step with some logging to see if everything is happy.

Thnx

[30 RUM]

15569Just go done cross referencing MAF lbs/min verse Mafreq2.hz it is off when comparing to the tune. In the log 49.34 lbs/min is equal to 8237 hz, in the tune 51.51lbs is equal to 75.76 hz. The truck has a new MAF sensor on it, I have not reprogrammed with the TEC-2 yet. Do you guys have any idea what could be causing this?


Thnx

[LB72004]

i would return the truck to stock programming first then log that and see if you are still having this problem.

do you know what it was programmed with before?

[30 RUM]

The truck was programmed with H&S. Well just got done returning the truck to stock, then put a new program in with a Tec-2. I read the program out with the V2 did my adjustments for emissions, reprogrammed with full flash and still having the same problems. This time I have a P0101 Mass Air code. So I am suspect to the new Mass Air meter that was installed. Also I still do not see any Torque in the Data Log. It that normal with the LMM? Like I stated before I do not have to much experience with the D-Max but I have a handle on the Cummins side.

Thnx