Correct Injectors?
10-27-2004 | 05:32 PM
#11
I can vouch for the 99 PCM's being poopy, so can 99Silver5.3, Creederado, and a few others I can't think of right now. Those guys swapped their PCM's for 02 versions and are very happy with it from what I hear. I'm gonna be taking a similar route very soon. The only issue is a blinking battery lt that I believe can be remedied by running a wire from the alt to the PCM...or so I've heard.
Almost forgot, I've got 02 6.0 injectors in mine now...it'll run without tuning the computer, but to work properly the computer must be tuned. Direct swap, piece of cake.
Almost forgot, I've got 02 6.0 injectors in mine now...it'll run without tuning the computer, but to work properly the computer must be tuned. Direct swap, piece of cake.
10-27-2004 | 06:12 PM
#13
I'm very happy with the results of the 02 pcm. Have had no problems with it at all, other than the security relearn crap. Now if only we could figure out how to keep the damn battery light from flickering on 99 trucks with new pcms. 
Hey, I'll take a light over bad performance anyday!
Hey, I'll take a light over bad performance anyday!
Originally Posted by BigTex
No they aren't maxxed out stock, but they only support just over 300 rwhp NA. The big issue is the 99 tune. It stinks. Even with Edit its hard to make a 99 run GOOD. They have some major issues with very bad knock retard and the stock timing is very low. By moving to a 01 PCM, you don't have to deal with the knock issues, as GM has most of the bugs worked out by now. Torque management is more an issue in 01 than 99, but if you have a 99 you aren't making as much power as you could be, so its a wash. TM can be tuned out though. Since the 01s use those larger 24.5# injectors, its easy to swap PCMs and injectors.
My near stock 99 Z71 5.3 dynoed 218 at the rear in 2nd gear. An 01 with similar mods (muffler, hypertech, and K&N filter) will make 30+ more HP than that. A little bit of that power is in the slightly larger cam, but the rest is in the tune.
I told slowprocess to have his 99 truck custom tuned with an 01+ version. I think he's happy with the results. Of course he doesn't know how much the PCM helped since he swapped motors, trans, converter, headers, and exhaust at the same time.
My near stock 99 Z71 5.3 dynoed 218 at the rear in 2nd gear. An 01 with similar mods (muffler, hypertech, and K&N filter) will make 30+ more HP than that. A little bit of that power is in the slightly larger cam, but the rest is in the tune.
I told slowprocess to have his 99 truck custom tuned with an 01+ version. I think he's happy with the results. Of course he doesn't know how much the PCM helped since he swapped motors, trans, converter, headers, and exhaust at the same time.
10-27-2004 | 07:03 PM
#14
Originally Posted by BigTex
parish8 and jlwz71 are a couple of others who will give you the scoop on the 99 PCM.
10-27-2004 | 08:43 PM
#15
So I can just go to the dealership and ask them to flash the PCM to a 00'+ VIN? They will just do this, no question asked? Will this void the warranty 
Thanks for all the advice guys
Thanks for all the advice guys
Thread
Thread Starter
Forum
Replies
Last Post
SlvrSierra4.8
GM Parts Classifieds
7
10-01-2015 10:39 PM
Pontiac Derek
GM Parts Classifieds
3
09-19-2015 02:49 PM
