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Returnless/non-referenced fuel system in a 2002? What's the fuel pressure?

Yes but whatever data was provided you could just as easily got to by making adjustments based on how it behaved. i.e., it's just tuning, it's not hard specs that shouldn't be fiddled with like the...

Transient stuff is tuning stuff IMO, others disagree. But I've never seen an injector datasheet that includes anything about transients same as I've never seen one that includes a VE table. Just...

Because it's 2 credits for a PCM you've never written to before and 2 credits for the file you found someplace that came out of somebody else's PCM (yours is corrupt and can't be written to the new...

No because it doesn't work that way. A '.hpt' file is an ECM file and a TCM file combined into one thing. Changes you make to the Transmission side of things get applied to the TCM. You're writing...

No, the '05-06 Trailblazers both 5.3 & 6.0 were 24x/1x, they just have the Gen 4 block/knock sensors/conrods/intake manifold/etc., 2006 car LS2s were 58x/4x. GM never mixed 24x/4x or 58x/1x though...

24254909 is 2010 CTS-V, correct?

I am preeeety sure that even though that ECM and that TCM will both talk to the data link connector and both can be read/written, they are not actually talking to each other. The GMPP/CPP ECMs are...

As a test, do whatever you have to do to disable the bypass valve so it stays in the 'open' position. I know on the LSA's just removing/capping the vacuum hose defaults the valve to open all the...

12200411 is the Service Number, which describes the hardware inside. 12212156 is the operating system (the software that runs on the hardware). Any PCM with the service number of 12200411 can be...

'78 F100 relisted at $2800, OBO: https://www.ebay.com/itm/235565189965

https://www.ebay.com/sch/i.html?_nkw=12200411+programmed+vin

Much cheaper than all the stuff you'd need to buy to flash this one PCM this one time that may not even work, probably also cheaper...

Attach files here, not offsite. It's free and no one can ever take them offline except HPT themselves.

PCM is corrupt. You can try a dealer-type reflash with dealer-type tools (Tech2/MDI + SPS),...

Yeah, but 'recommended' for what combo? What rockers? What RPM? This one seems to work just peachy up to 6300, they're perfect for that much.

I think you probably don't need more open pressure; it's probably fine with 400 open, it just needs more than 140 or whatever it is on the seat (depending on the installed height, which is as yet...

Some people have a learning plateau instead of a learning curve. This one has started three threads, has attached zero files for any of them.

I'm thinking of writing a little script that...

146446

That's the cells that line up from the Gen 4/304 kPa column, the rest has to be interpolated (across each of the empty cells) to fill out that column, then that column pasted all the way across....

If you go more than 400lbs open pressure, allegedly, the stock or stock-type non roller tip rockers and valve tips start having wear issues (and it's not just a geometry thing). The only roller tip...

Or, I mean, you could just put the data in that matches that fuel pressure.

146439

The 0 kPa column in Gen 3-format data is assuming 58 PSI rail pressure. For 43 PSI, you need to use the 304 kPa Delta column from one of the Gen 4 tables in the spreadsheet. There's no way to work...

Or... if the base pressure is lowered from 58 to 43, then the referenced regulator can add up to another 15 PSI rail pressure before the in-tank reg pops off. And adjusting the injector data for...

Yeah, airflow scaling is... yuk. Makes everything so complicated for anybody who comes along later trying to help and wasn't there from the very beginning.

They make plugs that go in place of the little pod regulator thing in the pump module, got to have that done if the system is ever going to be able to make more than 58 PSI. Lingenfelter has them.
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Is this like when you work at a shop and you come in one morning and there's this car/truck parked out front you've never seen before that's showed up out of the blue and it just has a note under the...