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Me either, but since all the Coil Packs have been replaced, no codes, no issues.

Thanks everyone!

Replaced all the coil packs with higher quality ones (MSD). Seems to have fixed the problem so far, runs fine, no codes. Don't use cheap coil packs and replace any old ones...

Ok thanks. The U codes are recurring, meaning we clear them and they come right back.
We had a code for misfire on Cylinder 3. Changed the plug and installed a new coil pack... the Cylinder 3 code...

Car shudders under load. Can rev in park to 3000-4000 rpms nice and smooth. Stock Calibration, never flashed.

Underload it stutters, then throws the following codes:
U0401 Invalid Data from...

On Universal Credits, it just seems to be the same if I am just licensing per vehicle, meaning I have to buy 2 credits for my 2017 SS either way. I can see universal being handy in a shop where I...

Thanks. I am going to have to give the new laptop to the wife and take her older one....to avoid the Windows 11 thing.

Is there any upgrade path for MVPI to the newer ones? Looks like there was...

Same question here, just really tuning E38 (LS3 in Chevy SS), doesn't seem like there is anything to be gained with MVPI3 over what I have now MVPI(1) Pro? Only thing I can see is support for...

Ok well I have it working on Win 11, with my MVPI pro. It will connect, scan, read DTC. On the editor though it won't read my stock calibration from the vehicle, however, did something change with...

First, I try to get my MVPI working on Windows 7. Lots of fun upgrading my older laptop, working around getting .NET 4.8 installed only to have VCM editor crash opening my stock tune file... (opens...

What's the vehicle functions? Things like turning the fan on/off from the laptop? Ie. real time vehicle controls?

@Engineer you might want to update the supported vehicle list, it only shows...

I have a 2017 Chevrolet SS on order, is there plans to support the 2017s? I see the 2014-5 are supported.

Hmm..hoping to avoid that since the stock sensor was crossthreaded, which means I would have to go buy one...of course at this point it might be the only solution..unless there's an tune in the...

2002 GTP. If I put the rear O2 sensor back on (with no cat) will it still run the test? I have .bin files from some previous tunes, but it seems that only DHP can change it (I have the tiny...

Its a few years later, can we delete this test with HPT? I am running 2.24

And I was running 93 octane...but now with the lower timing, I could probably go back to 87. Might have to remove some timing from the AFM areas though.

Not sure why its in the Trans section, but its a great post.

I did some testing at the track on Sunday, using this post as a guideline. Got decent times with higher timing 25-27, but got a...

4744647447 Frames 188-243...a couple downshifts...

Anyone figure out how to minimize (eliminate) the delay in return to full timing from Trans TQM during a powerdownshift?

Mine shifts say 6-2, within about .15-.2 sec, then the timing stays at Min...

Just had this happen to me 2.24.81. Can clear DTC, but not read them...they are all blank. Scanner connects everything else works (scan, VCM controls etc). Just doesn't show any code information,...

Thanks, Bill

I usually flash it back to stock for any dealer visits.... ;-)

I will try to do a read later today.

I have recently acquired a 2011 Suburban LTZ

Is this supported--the list shows only 2010, but I imagine 2011 is pretty close..

More importantly does the 2011 have a Flash Counter? I don't want...

Don't you mean decreasing? I don't think there's any requirement...its a good bit art mixed in with the science.

My 2 cents...I wouldn't shift point any higher than 6200. By the time it shifts you'll be in the 6200-6400 range...

So you can modify the TQM so that there's less TQM at higher RPMs. This works...

PM me your email and I will send it to you.

Read up on here and some of the G8 Boards...several of us have had some success with the 6L80. Also you need the latest beta of the HPT software.

Did you change the Cat over temp by chance? ...