Jump to content

LQ4 to LY6 Engine Swapp 2002 2500HD

jeffglitman

Recommended Posts

jeffglitman New Member

jeffglitman

Posted
Posted

Hi Guys, I am new to this site and am looking to bring my tired old 2002 2500HD Silverado back to life. It has an original 6.0L LQ4 engine GM Part# 89018180. I do a lot of work on cars and trucks but this being my toy hauler, I am looking for a quick swap of engines. Has anyone every swapped in a newer version LY6 engine? I can still get a fully loaded "New GM" engine and was wondering if this would even work. I understand that the LQ4,LQ9 & LY6 share the same old Cast Iron block but the LY6 has the newer L92 heads.

 

I believe all of that so far will work ok an fit an bolt up of my accessories will not be an issue. The problem I foresee is the LY6 has the VVT. I see Summit Racing and others have the VVT Delete Kits available which included a new Cam Gear and front timing cover. (http://www.summitracing.com/parts/cmb-09-0027/overview/).

 

 

I have read other guys install such a kit but they always upgrade the cam, valve springs and pushrods to a beefier cam. I am looking to just delete the VVT option and drop this into my truck keeping the stock ECM program.

 

In Short, has anyone done this or know if it will work?

 

Thanks in advance for your help guys.

 

Chris Senior Enthusiast

Chris

Posted
Posted

Nope nope and nope. They dont share a block. To keep the same everything, look for LQ4 or LQ9. LY6 is a Gen 4 and requires a new harness and computer. you can put L92 heads on the Gen 3 engines, you just need a new intake manifold and run some custom plumbing

  • 2 weeks later...
jeffglitman New Member

jeffglitman

Posted
  • Author
Posted

Thanks Chris, but maybe I wasn't clear. I have a chance to buy a brand new complete GM crate LY6. This is an overstock engine that GM would send to dealerships in case they needed to swap out an engine under warranty. I know crank,cam and knock sensor will need to be re-wired due to change in locations. Will this engine physically fit in place of my LQ4 in my 2002 2500HD? If I do the VVT delete, then can't my existing ECM work or even if I have to get it reflashed? Also saw some folks using the lingenfelter TRG-002 58X-24X CRANK SENSOR TRIGGER CONVERSION MODULE.

 

I can live with minor mods.

kstruckcountry Senior Enthusiast

kstruckcountry

Posted
Posted

It's not going to be minor, I don't believe it even is a direct fit physically. It won't talk to your stock ECM without some serious changes. I'm sure it's doable, but if you're getting too great of a deal to pass up, buy it, sell it, and pickup up an LQ4/9 for cheap.

 

I would talk to Pacific Fab, they can give you the closest to plug and play if you really want to do it.

Chris Senior Enthusiast

Chris

Posted
Posted

Your current ECM will not run it. Motor mounts and everything on top is different than your LQ4. It may be a great deal, but in time and parts to make it work, getting a crate LQ4 makes more sense.

 

Basically youre looking at motor mounts, flex plate, ECU, standalone 4L80e trans controller, full gen 4 engine harness, custom fabbed intake setup, new fuel lines because yours has a return and anything 04+ does not, new fuel punp, new inectors, and your gauges not working

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Chuck FB
      Gas Prices

      By Chuck FB · Posted

      I wonder what the price is out at the coast, Big Sur or other out of the way locations as I bet they are charging quite a premium over the in land pumps. 
    • Chuck FB
      2 speed transfer case optional now?

      By Chuck FB · Posted

      Were you looking at the HD trucks on the GM website or the half tons as that makes all the difference. As far as I know there are only two options for the HD trucks and that is the standard 2 speed transfer case or the 2 speed transfer case that has the added 4 high auto feature and they put that transfer case by default into the LTZ and High Country although its optional in the LT and not sure if its available in the work trucks.    The half tons, that is where its been a total mess in my estimation for a few years now with most trucks below the top trim having the single speed transfer case as standard but with the option of having the two speed such as one would get by choosing the Z71 package, however then not being able to get the two speed transfer case with the towing package unless it was a higher trim truck AND had the 6.2 gas so one could combine the towing package gearing diffs with the two speed transfer case. Having said that if its a trail boss package then it gets the two speed transfer case but not necessarily able to get the tow package as it would depend on trim level and engine chosen. Believe me, people have bought the GM half tons assuming "of course it will have a two speed transfer case" only to find out after when they really pay attention to what they now own .... crap, there is NO low range !.    I don't believe Ford or Ram have gone that way yet with their half tons but like I say its been a few years now that GM has done this with the half tons. 
    • Atlas
      Gas Prices

      By Atlas · Posted

      $5.19 for regular...
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      My office is slowly filling with Blazer parts. Getting ready to do the big bang of repairs. Intake (second time), water pump, radiator, hoses, and I'm going to re-seal the timing cover where someone went hog wild with silicone. Might as well, because I don't think that's done right.   There's a local tow yard that I didn't realize also has quite the inventory of junk vehicles. This is an old school junkyard. No waivers. Cash only, you were never here if anyone asks. Don't piss off the owner, or you'll end up in the back of one of those cars, headed for the shredder. And if you see something, don't snitch. Cars stacked double high, wasps nests, trip hazards and junk everywhere. I found a few little odds/ends for my Blazer. The $20 I spent was worth the experience alone. But I was never there. What yard?   I officially love/hate this truck. It's so out of my wheelhouse, roughest vehicle I've ever owned. Every. single. repair. -is so hard-fought, everything that can go wrong, goes wrong. Currently in a hate phase, and kind of wish I was closer to sending it down the road with a lucky new owner, to be honest. Preparing for the day when I tear into this thing...lots of pre-funk with Ibuprofen.   Rock Auto sent me a bad reman rear wiper motor. It was a bear to install. The tailgate in these things has about eleventy-billion fastners and pieces and things that need to be uninstalled/moved just to access the shoddy rear wiper motor. The casing on mine was cracked clean through, btw. Nice, GM, nice. SO I got this new motor installed, hit the switch, I see it wig-wag (without the arm installed) and think I'm golden. Reassemble everything. With the wiper arm installed I gave it one final test. Time to clean up and take the other half out to dinner, collect a paycheck, right?   Nope. I hear the plastic worm gear stripping as the arm hung up. Just like my broken motor. Weak/old and shredding itself internally. I can assist the arm and the range of motion is normal, and it parks correctly. It just doesn't have the poop to actually sweep the arm with a blade on it. Oh, hell. Turned the key off and shut the shop door behind me. I get to do that over again, too.
    • BlueV8
      AFM Disabler Question

      By BlueV8 · Posted

      A complete delete is the most thorough mechanical solution, but it is also major engine work. On a quiet truck that is still under extended warranty, opening the engine purely as prevention is difficult to justify. A plug-in disabler stops commanded cylinder deactivation, but it does not remove or repair the collapsible lifters, so it should not be treated as failure insurance. I would keep the oil full, document the maintenance, and have any persistent tick, misfire, or loss of power diagnosed promptly. If the engine eventually has to come apart, that is the logical time to compare an OEM-style repair with a complete delete. The right choice depends on the truck’s symptoms, warranty status, expected ownership period, and whether the engine already needs to be opened. We explain that decision in more detail here—full disclosure, this is our own guide: https://www.bluev8.com/blogs/news/do-you-actually-need-an-afm-disabler   One exception: some 2021 L82/L84 trucks have RPO YK9, meaning cylinder deactivation was already disabled in the factory ECM; on those trucks a plug-in disabler is redundant, although the AFM/DFM hardware remains inside the engine.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...