PCM Conversion Information

[GXP25]

Hello GXP25,

Sorry, I should have been more clear …

Are you saying the 05-06 LS4 engines are actually Gen III variants (24x CKP / 1 CMP) like the early LS2 engines were ?

And that the LS4 engines transitioned to Gen IV variants (58x CKP / 4 CMP) in 2007 as did the later LS2 engines ?

Yes, even though they're officially classified as Gen IV engines. Then again, aren't all Gen IV engines based off of the Gen III design?

"Gen IV" doesn't necessarily equate to 58x/4x.

If so, this would be very helpful to anyone considering an LS4 / 4T65 conversion (especially the Fiero die hards) - potentially allowing the use of a LS1-B PCM - which puts cruise control, Lean Cruise, DBC, and other options “back on the table”.

Have you been to fiero.nl lately? LS4 swaps are all over the place, lol.

I greatly appreciate your input - we were lacking Gen IV information from reliable sources when putting the conversion chart together.


Regards,
Taz

Not a problem at all!

[turbo_bu]

Sorry for not getting this updated sooner. Was out of town all last week. I have made the updates GXP25 / Taz have highlighted. One quick clarification: I was wanting to call out which of the 05-06 E40 LS4's came in from the factory. Guessing Impala SS / Grand Prix GXP / Monte Carlo???

Also, when did the V8's start in the Trail Blazers? Sounds like the 06 TBSS was a 24X E40. But were the 5.3's also the same (I would think so).

[odd boy]

good info, thx for sharing

[ScarabEpic22]

The 5.3 was offered in 03 for extended TrailBlazers and continued up through their demise in 09. SWB TrailBlazers got V8s in 06 with the TBSS (LS2) and the 5.3 LH6 being an option. However the Rainier and Envoy Denali got the 5.3 option in 05 IIRC (before DOD was introduced), in 06 DOD was standard.

Breakdown of how I see it:
02-04 TB LWB 5.3 V8s: LS1 PCM 24x/1x
05-06 5.3: E40 ECM 24x/1x
06 LS2: E40 ECM 24x/1x
07-08 5.3: E67 ECM 58x/4x
07-09 LS2: E67 ECM 58x/4x

02-05 4.2L I6s: P10 PCM 7x/1x?
06 I6: P12 PCM 1MB 7x/1x
07 I6: P12 PCM 2MB 7x/1x (updated 6-13-11)
(but 06 and 07 P12s dont interchange, different flash sizes)
08-09 I6s: E67 ECM 58x/4x? (not sure on cam reluctor)

The reason the years are only through 08 for the 5.3 is GM didnt make any 5.3L TBs for the half MY 09.

[turbo_bu]

ScarabEpic,

Thanks for chiming in. I was hoping that you could clarify the TB stuff for us.

Anyone else have any info on years / models that the LS4 came in?

I will finish updating the spreadsheet and post the updated version in the next few days.

Thanks,

[turbo_bu]

Here is the latest with the updates for LS4 and LS2 information. Please post up if there is anything that is incorrect.

Thanks,

[joecar]

Thanks for the update.

[turbo_bu]

Guys,

My apologies for the incorrect previous post. I did not quite clean up the E40 row with what has been documented by GXP25. Please delete the previous version for those of you following along at home.

Thanks,

[1FastBrick]

LS1B Application DBW was availible around 2000 on SUV's and Trucks if you had features like Auto Ride or traction control. They are few and far between but they are out there.

[Taz]

Hello 1FastBrick,

DBW was introduced on select 2002 truck / SUV (LS1B PCM) - these were a limited production run. All 8.1 L (LS1B PCM) were DBW.


Rgards,
Taz