Hummer H3

I have a customer that came to me today said her Hummer is started cutting off scanned it with my solus and code P0102 (mass air flow circuit singal low) the previous owner put a flow pro exhaust electric fans k&n intake and a pro flo mas air meter in and he sent the pcm off and got a reflash done on it but she doesn't know who or where and she wants me to try and fix it would my best option be to datalog it and upload it here and get help or try putting a tune from the repository in it first im nervous to do to much to it because i just got hp tuners on 12-30-16 and have only watched 100 youtube videos and read alot of this forum have no hands on experience yet other than i did a scan of my tahoe to learn what i need to do. I live in the sticks the closest person to try and go learn from is over 150 miles away so any help would be great thanks

Put a stock MAF back in it, they are far better than those other pro flow things.

Find a stock calibration and copy the stock MAF table back over. Don't write a whole file that isn't yours to the computer, just takes parts you need and copy them if you need to.

That's where I would start, see how it runs and make sure the MAF code is gone and it runs good. Then compare that file with a stock file to see what else is different and tune from there. Likely it may need some MAF tuning if the intake is larger than stock.

5FDP you are right its not mine and don't know whos it is and she doesn't care about anything but it running good and not being a fuel hog how could i copy a MAF table and load it i just downloaded a stock tune from the repository so would i just look under airflow and write all the figures down i see under that and then upload the customers pcm and just type them in manually

It's copy and paste like text.

If you have a tune file for that vehicle unlocked you can just copy the MAF curve (if different from the stock calibration) and paste it into the tune file.

ok customer finally brought me her h3 for the day and the factory maf i wanted scans and to read the pcm see what this guy who they sent it off to put in it and it looks really wacked to me but im still new if you don't mind will you look at these scans and see what yall think i think her tps sensor is bad at wot im only getting 88.2% and the reason its here is because when you start it up sometimes not all the time it lopes for a few mins and also when she pulls up to stop sign or light or anything it will just shut off on her and shes had it shut off just taking her foot off the pedal and thats just unsafe so any help or critcizism is greatly appreciated thanks

I've never tuned a H3 before but just from looking at the log files, it's going to need a little VE or MAF tuning. If you can compare the tune to a stock tune you'd be able to see what they changed. Swap over a stock MAF curve if they changed that and you re-installed the factory MAF. Currently it's trying to pull fuel out at idle by a lot, -12%.

Then you can start doing a maf tune to bring that back in line. Also on the newer computers, that TPS will read 88% at full throttle.

ok i thought that was weird but thats so i did compare the stock tune to this one and im contemplating just installing the stock maf and stock tune and saying here you go i feel like who ever did the tune got it wacked out

update i put the factory maf in and didn't do anything on the tune and its alot better on the cruise and wot but still off but i think she will be happy with it took away the dtc and lope at start up

Quote:

---

Originally Posted by gibbswrecker

ok customer finally brought me her h3 for the day and the factory maf i wanted scans and to read the pcm see what this guy who they sent it off to put in it and it looks really wacked to me but im still new if you don't mind will you look at these scans and see what yall think i think her tps sensor is bad at wot im only getting 88.2% and the reason its here is because when you start it up sometimes not all the time it lopes for a few mins and also when she pulls up to stop sign or light or anything it will just shut off on her and shes had it shut off just taking her foot off the pedal and thats just unsafe so any help or critcizism is greatly appreciated thanks

---

For anyone else researching HP Tuner for the H3 Hummer 3.7 A/T this tune is good, comparing it to my stock 2007 H3 auto.

The only thing that is different with the MAF, "Airflow VS Frequency" is above 6,900HZ, IE above idle and most cruising airflows, at 7,200HZ it's 2% Higher and 10,500HZ 5% higher
All the emissions DTC's are there.
The Power enrichment is a little more aggressive
The Idle RPM is slightly higher when warm, needed IMO
The torque management for ETC is gone with very little timing retard, control, compared to stock.