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Thread: Couple questions for the Ls guys......

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    Club Member mikesfastss's Avatar
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    Cool Couple questions for the Ls guys......

    I have a 05 Denali 6.0, it seems the oil pump quit and itís now locked up.

    First question is can I swap a 5.3 in with out any hassle and if not what does it take to work?

    Second question is what years are interchangeable and should I be looking for a certain year versus another due to better quality? And yes I realize itís really 4 questions lol.
    mike

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    Forum Member RSpencer's Avatar
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    Everything will physically bolt up the same however without a cal for a 5.3 itís not going to run correctly.

    It should have an LQ9 (higher compression 6.0 found in Silverado ss, escalade, Denali). 03-06 would be the year range to look for. An LQ4 would work as well. Slightly lower compression but much more abundant as these came in HD pickups.

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    Club Member Beigg's Avatar
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    Using the matched PCM taken from the same vehicle youd obtain the 5.3L from, it might be plug & play. Otherwise, the other option might be to flash it. I'm not sure if you'd require dealership support still...

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    Forum Member CruisnCobra's Avatar
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    I have a buddy who put a 5.3 in a 4.8 truck and it ran on the original PCM. It seemed to run fine but he got an aftermarket tune fairly quickly after the swap

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    Swapping PCM's might be an option, but is the wiring the same pin for pin on each?
    I have no experience with any LS engine, but that would be my question when trying to run A with B.

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    Forum Member RSpencer's Avatar
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    PCM swap would likely result in a no start due to conflict of VINs between pcm/bcm

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    Club Member mikesfastss's Avatar
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    Yeah kinda what I figured just wasn’t sure about the reluctor wheel and that stuff, I’ll just spend a few extra dollars and get the 6.0 when I do it. Not gonna be anytime soon with this weather and my work schedule. Thanks for the help fellas.
    mike

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    Club Member Beigg's Avatar
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    Quote Originally Posted by RSpencer View Post
    PCM swap would likely result in a no start due to conflict of VINs between pcm/bcm
    that is what I was unsure of. The vin can be changed in the PCM tho.

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    Forum Member ultradriver10000's Avatar
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    Actually a 5.3L from 2001-2007 should work fine even with the stock computer and harness from your truck. The 02's will reset your long term and short term fuel trims and it should run a-ok.

    The 5.3L and 6.0L use the same injectors, just slightly different amounts of fuel. If you want to sell the smoked 6.0 I might be interested.

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    Forum Member BrainFearGone's Avatar
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    Quote Originally Posted by ultradriver10000 View Post
    Actually a 5.3L from 2001-2007 should work fine even with the stock computer and harness from your truck. The 02's will reset your long term and short term fuel trims and it should run a-ok.

    The 5.3L and 6.0L use the same injectors, just slightly different amounts of fuel. If you want to sell the smoked 6.0 I might be interested.
    as long as it’s 24x it should be fine right?

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