97 Suburban k2500 454 0411 swap

[Wheeler454]

So, this is my first post. So please bare with me, and sorry if I sound so new to this. I have a 97 k2500 suburban with the 7.4 liter engine in it. I have only started to do some mods to it. But nothing major yet. I have done the 0411 swap, K&N CAI, and have changed out the fuel pressure regulator and injectors to ones that I was told match stock injectors.

But I do not know where to start with the tuning of this beast. It does start and drives ok. Seems to me little there is a lose of power from the black box that was in it, and it seems to run a little rich. I have included a file from my first test log after installing the 0411. Being that I am new to this I am not sure exactly what I am looking for. But to me the 02 readings are all over the place and the Advance seems really high to me.

Can anyone point me in the right direction? Any help would be greatly helpful. Good thing is that I do not drive this truck very often, so it is not a major rush.... Just want it to be like it was before.

4.20.24 Suburban Re-download.hptTest Run 4.21.24 9.30am.hpl

[blindsquirrel]

injectors to ones that I was told match stock injectors.

Source, part number?

O2's 'all over the place' is what they're supposed to look like when it's in closed loop, that's just how it works.

[blindsquirrel]

No EGR, no AIR pump, no cats?

[Wheeler454]

I purchased the injectors from motorman.com... Manufacturer: Bosch

Body Style: EV6

Oring Size: 14.5mm Viton

Plug Connector : EV1 / minitimer / jet-tronic

Coil Resistance : 14.5 ohm

Flow Rate @ 58psi : 24lb/hr

Nozzle Type: 4 Hole

0280155746-8 Injectors

I do have the EGR valve still connected, al9ng with the factory cats. Not sure what you mean by air pump. Everything on the truck is stock for a 97 suburban. The only thing I've done was the injectors and CAI. When I did the 0411 swap with the pin out from Lextech, the PCM was sent to some9ne the he recommended to have a base tune installed. I have not messed with that tune at all.

[Wheeler454]

I am really new to all of this. Just s9mething that I really wanted to learn, and the internet just seems covered in information. But the more I read and try to learn, it seems like the more questions I have. And I learn more from doing and watching, versus spending hours reading.. that would be my one downside. Just hope someone can enlighten me a tadand give me a little bit more of direction on the next steps. Was reading a lot of information on wideband O2 sensors, don't know if this would be a helpful step for tuning this style truck or not. Seems like starting on something that is so old might be a pain as there is so much diffrent information out there.

[blindsquirrel]

Well the first step is getting the tune file set up correctly for the hard parts it's connected to... AIR pump is still enabled in the tune, and even though there may not be an AIR (smog) pump on the truck, the PCM is going to do things like spark and airflow changes when it thinks the AIR pump should be running... same for EGR, there are spark tables. And catalyst lightoff spark tables that aren't needed if there are no cats. I saw all the cat codes and downstream O2 codes turned off, and assumed they'd been removed. If all that stuff is still there those things shouldn't be disabled in the tune.

Your injector data is not correct, leaving aside the likely fake injectors. The Flow Rate table and Offset table are set up for different fuel system types. Flow Rate is 'flat' like for a vacuum-referenced regulator, the Offset table is 'sloped' like for a non-referenced returnless system. But all of the injector tables are different from the '02 Express stock base file, so I don't know where it came from.

screenshot.22-04-2024 19.41.23.png

Please don't use shady injectors from shady sellers. Fakes may have the right numbers printed on the side and have the same dimensions as the ones they claim to be, but their characteristics are a complete mystery.

[blindsquirrel]

Oh, Volvo injectors. You aren't likely to find GM Gen 3-format data for those even if they aren't offshore fakes.

[Wheeler454]

Well thank you for the reply, I will start by adjusting the items that are saying they are either there or not to reflect what u really have. As for the injectors, I hoped they were not fake as I don't have a endless supply of money to put into this project. I am hoping to figure this one out. I believe the injector days I used was from JT on YouTube performing the same swap on his 97 suburban with same engine and setup as mine. He does have lots of videos and information. It seemed helpful at the time. What would you suggest for the injector table after the correction of the O2 and air pump issue in the tune file?

[Wheeler454]

Which injectors would you recommend for this truck? I should of went with the 5.0 motorsports injectors like i wanted to, but they were very pricey. I guess this is what I get for trying to save a little cash.

[blindsquirrel]

injector dimensions2.jpg

Only the LS1 injectors are the same length and same connector. They're also probably extinct in the junkyards by now, and new they're stupid expensive... like $150 each expensive. If you could find some used for cheap they would be ideal though.

Many options with the later truck injectors, even though they will need top hat adapters (unless you have spacers under the rail mountings that can be removed or shortened to drop the rails down lower) and different harness connectors.

[edcmat-l1]

injector dimensions2.jpg
They're also probably extinct in the junkyards by now, and new they're stupid expensive... like $150 each expensive. If you could find some used for cheap they would be ideal though.

OMG I been throwing them things out for the longest time now. Think I'm gonna go cry now. Thanks a lot! LOL

[Wheeler454]

Would you happen to have a Bosch part number that would work? What if they are purchased new from discount, autozone or Orielys.. could these be considered ok?

Autozone shows Bosch 62716 new injectors for 50 each, would these work for my application? Not looking to add anything extra for performance upgrades, the only other thing in the future is the exhaust.

[Wheeler454]

Also, one other quick question, as I don't know hptuners to good. Could you give a little more detail on how to disable the air pump and reactivate the cats and 02 sensors.

[blindsquirrel]

A Bosch part number that has the right outside dimensions isn't going to give you something you can get all the GM-format data for. You already have some of those. If it isn't an injector that GM put in at the factory then finding the data is just going to leave you stuck again.

If it was mine, I'd go straight to the super cheap 51lb L96 injectors, top adapters, and crimp on new EV6 pigtails. All for around $160 total.

[blindsquirrel]

Type CTRL+N. Type in 'air' (or any other keyword).

screenshot.23-04-2024 07.49.55.png

The cats & O2s are in Engine Diag > DTCs. Use a stock '02 Express file in Compare, that will highlight (with an outline) which codes have been changed. The outline goes away when the codes have the same setting.

[Wheeler454]

That sounds like those might work, really hate to change them out again, but it is what it is. Let me see if I can make the changes and i'll get back with ya. Thanks again for all the help.

[Wheeler454]

As for the air pump it is saying that below 36 degree that the air pump is disabled. Dont that mean that it is on? Also, when I go to engine Diag. and look for anything to do with the Cats or O2 they are greyed out. And gives me a warning at the bottom that these are not able to be changed due to EPA rules. What do I do there?

Sorry I sound like such a newbie, but that I am. You have been a great help.

[blindsquirrel]

Help > Parameter Access. Do the 'training'. Enter the code.

[blindsquirrel]

Do you have an AIR pump, and do you want the PCM to think it's available anytime coolant temp is above 36F? If you do have an AIR injection system (I don't think you do) is an '02 Express PCM going to be able to control the '97 pickup's hardware? Same for the EGR... you may have an EGR valve on the engine, but are the controls and hardware compatible between the truck and what the PCM thinks it is plugged into?

[Wheeler454]

ok, I am working on unlocking the options on my hptuners. Then I will start by getting the hardware configured correctly for what I have. I am then going to look for newer injectors to change the ones I have out again. Do you have a link for the L96 injectors with the adapters that you mentioned above? Just seems like when you google them there is a bunch of options and want to make sure that I am getting the correct items to fix my problems that I am having.