L96 swap 2001 Silverado 3500 LQ4 truck

Hello, I bought a project 2001 dually missing its original LQ4 engine. I got a great deal on a brand new 2018 L96 so I swapped it in. I did the knock sensor relocation and used the Lingenfelter converter box. I'm using the original throttle body with an adapter plate, original map sensor,maf,Corvette fuel filter,deleted the vvt and installed a new GM LQ4 cam. I bought adapter harnesses for the injectors. Truck runs but rough like a lean misfire complete with smoke out the tailpipe. Obviously, injectors,intake and head flow are totally different than the old LQ4.

I bought me a MPVI2 and I'm going to learn to tune. Right now I was to make certain it will idle and drive out properly so I'm not harming the engine or other components. On the scanner STFT was -15% which I believe is lean. The last engine I tuned was a 455HO in a GTO so I'm new to flashing computers.

I searched for L96 swap tune info on the forum but didn't find anything meaningful to me.

Good advice on what to do to get this truck running decent enough to move it around in the yard and not hurt itself while I figure out how to fine tune it would be greatly appreciated!

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Originally Posted by horsepoor

Hello, I bought a project 2001 dually missing its original LQ4 engine. I got a great deal on a brand new 2018 L96 so I swapped it in. I did the knock sensor relocation and used the Lingenfelter converter box. I'm using the original throttle body with an adapter plate, original map sensor,maf,Corvette fuel filter,deleted the vvt and installed a new GM LQ4 cam. I bought adapter harnesses for the injectors. Truck runs but rough like a lean misfire complete with smoke out the tailpipe. Obviously, injectors,intake and head flow are totally different than the old LQ4.

I bought me a MPVI2 and I'm going to learn to tune. Right now I was to make certain it will idle and drive out properly so I'm not harming the engine or other components. On the scanner STFT was -15% which I believe is lean. The last engine I tuned was a 455HO in a GTO so I'm new to flashing computers.

I searched for L96 swap tune info on the forum but didn't find anything meaningful to me.

Good advice on what to do to get this truck running decent enough to move it around in the yard and not hurt itself while I figure out how to fine tune it would be greatly appreciated!

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a negative value on the fuel trims indicates that the engine is running rich not lean

It'll be rich until you enter all of the L96 injector characterization data. If you'll post your tune and the 8 digit part number of your injectors, we can help.

Attachment 90989Attachment 90989 this is last tune I tried. Injector p/n 12613412. Thanks to both for your help!

I have done tps relearn and it ran equally crappy on the stock lq4 tune

Your tune shows 25.2 lb/h. L96 should be 49lb/h at 58psi. Here is an L96 injector flow table
Attachment 90994

thank you, I will insert that data into the tune and try it!

That data won't just copy/paste over because of the differences in the calibration files.

Take a L96 file's injector data and input that data into this spreadsheet. That will convert the GEN4 data into the GEN3 data that you can input into the tune. You need to input all of things listed here and not just the injector flow rate.

ok, so I would find tune repository , get a l96 tune and copy the injector flow data into that spreadsheet.

did that but the l96 tune from repository had the same table referenced by IARLLC. Where would I find the L96 injector data to copy into that spreadsheet?

The flow rate is one part then look at the bottom of the spreadsheet for the other tables you are looking for.

Like the short pulse adder, offsets and min injector pulse. Find those tables and input the data into the spreadsheet.

I took injector data from a L96 in a 70 Monte Carlo tune I found in forums and my truck fired up, idled and ran well enough to move in driveway and no smoke or drama!! I am learning to tune!! As its warming up, it gets rougher so more tuning is needed.Should I do another TPS re-learn? I could not input short pulse adder data because number of cells is different in tune file than in the spreadsheet, what should I do about that?

Attachment 91723 There is the tune for L96 in 2001 Silverado. Truck runs and drives well. I used Flex fuel injector 12613412 Gen III compatible tables posted on another post by LSxpwrdZ and loaded them into my stock LQ4 tune with egr zeroed out (since L96 does not use EGR). Seems like the easy way out compared to the hours of fighting with the spreadsheet in the xls file . I could not get the spreadsheet to work properly as I alluded to in my previous post. Thanks to all who posted to help me but the big hats-off is to LSxpwrdZ for posting those tables.

Quote:

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Originally Posted by horsepoor

Attachment 91723 There is the tune for L96 in 2001 Silverado. Truck runs and drives well. I used Flex fuel injector 12613412 Gen III compatible tables posted on another post by LSxpwrdZ and loaded them into my stock LQ4 tune with egr zeroed out (since L96 does not use EGR). Seems like the easy way out compared to the hours of fighting with the spreadsheet in the xls file . I could not get the spreadsheet to work properly as I alluded to in my previous post. Thanks to all who posted to help me but the big hats-off is to LSxpwrdZ for posting those tables.

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I've been driving the truck for a few weeks. Misfire on #2 and #3 was causing MIL to flash. Followed updated crank relearn instructions for VCM Scanner and now misfires are gone!

Next step is 90 mm Edelbrock throttle body and Magnaflow cat-back exhaust.

Hey all! So happy I found this thread. Looking to complete this exact swap in the near future. 2001 LM7 DBC 0411 ECM 4L60 to a fresh L96. I know I will need to segment swap over from 4L80 to 4L60, but aside from that, how is the above tune, "stock 01 lq4 egr delete spa mip fr offset.hpt ", still holding up? Looking for something to get me started quickly as it's my daily driver. Thank you!