Micheal Tomac

The ATS turbo on my Duramax is hungy for air at WOT and I set P0103 codes quite regularly. It is a MAF sensor high voltage code that sets when the ECM sees the MAF sensor at more than 4.5 volts or 444+ g/s. I've seen the MAF sensor read a max of 470 g/s at WOT. Does anyone know if 470 g/s is the limit of the MAF sensor or is it higher? I don't feel the truck lay over but the ECM uses the MAF sensor for calculating fuel delivery so I'm wondering if the ECM is backing off fuel or leveling off fuel when I exceed 444 g/s air flow. Maybe it's time to find a MAF sensor that can handle more air.

zippy

not enough from diesel land to know what to tell you on your issue. what was your best time from the track sunday? i talked to you there, but didn't get to see all of your runs.

therock

iTrader: (2)

Call these guys. http://www.kennedydiesel.com/

XLR8NSS

iTrader: (4)

On gas engines the high limit is 453g/s but, I don't know what it is on the D-Max.

I wonder if EFILive will read a Dmax PCM? Probably not.

zippy

westers may have an idea, he can program their pcm's???

Micheal Tomac

I can count the number of Duramaxes running around with bigger turbos on one hand. No one has encountered this problem with the stock turbo.

I ran a 12.17 and a 12.24

BigTex

iTrader: (16)

Is this the same 85mm MAF as used on the gasoline trucks? Does anyone have a picture of the DMAX MAF?


Here is what I saw for that P0103 on a 2002 DMAX:

Conditions for Setting the DTC

* The ECM detects that the MAF sensor signal is more than 4.8 volts. This equals a MAF value of more than 490 g/s.
* The condition is present for more than 2 seconds.

Micheal Tomac

The Duramax and gas engine MAF's are different.

BigTex

iTrader: (16)

OK, Michael, any more info on the dmax MAF? I wonder if it could be made to work in a gas truck with tuning. I'd like to have a 490 g/s limit over the 454 g/s limit I've got right now.

PappyDan

iTrader: (4)

i know it has been said that the after market MAF is no good because of the lack of performance gains, but if the stock MAF is being max out at 454 g/s, what is the max for the after market MAF?