capt_zman

6.2 is here. Swapping a 2010 L9H into a 2013 4.8 L20. 6.2 has everything included, harness, e38 ecu, o2 sensors and all accessories. My truck currently has the e38 with a 4l60.

Is there anything other than dropping in the new engine and using my current harness and ecu or do I need to use the 6.2 harness and ecu? I have hptuners and can modify the tune pretty quickly from a stock 2010 L9H or am I oversimplifying things?

Thanks

Wolftrk99

iTrader: (5)

Shoukd be a drop in swap... use you harness and ecm, iirc the l20 has vvt but no dod, and the l9h is same way, the l9h harness should be set up for a 6l80

capt_zman

Yes u r correct. Both are VVT only and both are Flex Fuel.

Hopefully this will go off without any major problems.

capt_zman

Update:

6.2 is in and everything is running great so far. The 6.2 dropped in pretty easily. I used all of the accessories, sensors, ecu, and exhaust manifolds off of the 4.8 (since it was newer). The engine fired and ran pretty well with the stock 4.8 tune, but it really came to life with a stock 6.2 tune I modified. Just finished the MAF side of the tune and am now working on the speed density portion. It's has a couple of degrees of knock around 1200-1800 rpm at .24 to .72g, but I think it's do to being a mix of 87 and 93 in the tank. I'll try straight 93 next and then e85. If it continues, I'll take some spark out of it.

Holy crap what a difference in power. Now when I put some leg into it, I don't have to sit around and wait. Great upgrade so far.

Dyno scheduled for next week.

Duramax27

Hey man, I'm looking for some insight, I have a 07 Tahoe flex fuel that I swapped in a 2009 non flex 6.2.i used the harness from the 6.2 and pcm. It's just turning over no start I'm am completely lost.

FFDP

iTrader: (2)

Did you disabled the VATS system?

Are all the settings for various sensors correct for the parts you are using. Like the MAF curve, injectors, MAP sensor settings?

Duramax27

Yeah everything was done by my local tuner, but he was explaining to me that since my truck is a flex fuel I would have to get a non flex pump and module for it to run but I just don't want to go out and start buying parts

Tikiclub2

Are y'all running 4l60e still, or swapping over the 6l80e? My understanding is that the latter trans has a computer that comes with it. I have an 07 Tahoe that could use the swap.

capt_zman

Yes, still running the 4l60e but thinking about the 6l80 speed with new gears. So far so good

B00sted2007

why didn’t you just keep your stock wiring harness and Ecu from the Tahoe? You could’ve swapped the other motor in and fired it right up! Flex fuel has nothing to do with the motor, except Injector size. You could’ve swapped your new motor in, swapped injectors out of your old motor into it, and been good to go. No sense in changing ecu and wiring harness. Of course you would want to have it performance tuned after the swap, but that would be it.