Need help on 99 454, cant rev past 4800

[mathis]

sweet. sounds pretty straight forward. so basically any 01-02 gm v8 computer right?

[Taz]

The LS1-B PCM with service number 12200411 was used in 2001 & 2002. The most user friendly OS would be 12212156 from 2002. In a typical Vortec PCM swap (L31) this would require a tune from a 2002 Express / Savana. I have never participated in this swap with an L19 (454) - so I’m not sure what unique surprises (if any) await.


Regards,
Taz

[N0DIH]

Was looking inside some 99-00 PCM's, you can use them too, same processor/memory/clock. So buy whatever is cheaper.

L19 is the 95 and older TBI 454, L21 and L29 is the 96-2000 454.

[mathis]

Is it possible to get to new of a pcm. what is the year cut off?

[N0DIH]

2002 is newest you can use. 1999 is the oldest with the wiring diagrams that Lextech has done the hard work at detailing.

[mathis]

Alright so i bought a pcm and connnectors today. Its out of a 99 1500 with a 5.3. This should work just lovely shouldnt it? I can get numbers off of it if anyone can tell me wich one they need.

[ScarabEpic22]

Alright so i bought a pcm and connnectors today. Its out of a 99 1500 with a 5.3. This should work just lovely shouldnt it? I can get numbers off of it if anyone can tell me wich one they need.

Yep that will work just fine! Dont worry about the numbers, as long as it is a LS1 512kb PCM you're set. Use the OS Taz recommended for best performance, I believe you need to turn VATS off and do a few things but Jeff (Lextech) knows more about it than I do.

[mathis]

cool, thanks. was 60 dollars a good deal for the computer and connectors? What is VATS and how do i turn it off.

[N0DIH]

Need a tuner program like EFILive to turn it off. Yes, pretty good price (not stellar, my best is $10, without connectors, $35 with mount and connectors)

[mathis]

Hmm.. do i need or want the mount? I have efi live. Is it just a table within the express van tune i need to change?