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Hey guys I've got a couple questions. Im doing a swap on my 98 GMC. I have a Street and Performance harness. Im using the factory guages so I installed the factor (98) temp and oil sending units. Does the LS computer need a temp sender also? My harness has the transmission plugs also. Do I use the 98 ones or the LS ones or mix them? I was thinking use the stock Neutral safety wires but what about the speed sensor and stuff? Thanks Chris
Doing the same swap right now haha. Yes the ls pcm needs the coolant temp signal. Remove the obs transmission wiring, use the ls transmission wiring. The speed sensor signal will need to be split between the two pcms. Unfortunately I don't know about the NSS. Hope that helps a bit.
Yes it does. I just saw that this morning too. haha. Are you still using the stock 4L60E?Quote:
Originally Posted by shmiet
Ya I'm using the obs 4l60e, with LS housing, Shift kit, wider band for 2nd and 4th, billet solenoid, and a few other upgrades to handle the hp.
Why would you want to use two PCMs on a 98 truck????????
Jeff
[QUOTE=Lextech;511309]Why would you want to use two PCMs on a 98 truck????????
Jeff[/QUO
Because it runs the abs
I have had a 12200411 LS PCM in my 98 for about 7 years now. My ABS works perfectly.
Jeff
This is my first swap. Im new to the whole LS stuff. I was told to leave the factory one there. Do I not need it? What runs the abs if you remove it?
Lextech,
So for vss to the factory gauge you just used the LS pcm output signal and soldered it to the c100? if so did you do that pretty much for all the sensors? Will all the gauges work with proper tuning of the LS pcm? Will the 4896 pcm work?, from what ive read the 4896 just has less RAM.
Klug, On your 98 harness C1-15 Yellow/Black wire of the PCM will be installed into C2-49 of the Gen3 PCM. BUT---This is when using a factory harness. Since you have an aftermarket harness and I don't know what it does or doesn't have in it---You may want to run the two PCMs. If you ever do another one of these trucks, don't use two PCMs. It is not necessary.
Shmiet, I didn't mess with the C100 connector. I repined the stock harness for the Gen3 PCM and added 10 wires to the harness to run a Gen3 engine. All of my gauges work fine. The 4896 PCM will work.
Jeff
Thanks man I'm gonna give it a go.
And does the ls have an evo solenoid? Do I need one? Or do i have to use the obs power steering pump?
Sounds good. Ya I heard with this harness it is the best way to go. When I do another OBS I will be doing my own harness. Doesnt sound to hard just time consuming. I picked this whole setup from a older gentleman that couldnt figure it out so he sold the L59 engine brand new harness, programmed pcm, and throttle assembly for 400 bucks. because he didnt like the Drive by Wire setup and couldnt figure out what to do with the transmission.
My P/S pump was leaking a couple of years ago. I had a used non EVO S10 Blazer pump in the shed. I used it and I can't tell any difference in the way it steers. I wouldn't worry about the EVO sensor.Quote:
Originally Posted by shmiet
Jeff
Right on man thanks alot. Sorry i stole your thread for a minute Klug.
Its all good! That's what forums are for man.Quote:
Originally Posted by shmiet
ABS is overrated, LOL!!!!
I know!! lol I dont even have power brakes on my NovaQuote:
Originally Posted by RPM Graphics
Ok guys a couple more questions. Sorry like I said Im new to all these wires used to older BBC's. My new harness has an alternator plug on it. I saved the factory truck one also. Does the LS PCM need to be hooked up to the alternator also? Also there is a single green wire on the stock truck harness with a blue plug. Any ideas what it is? Sorry Like i said I am new to all these wires. lol
If the Alt plug is a four pin connector with probably just one wire in it---Then it doesn't need to go to the PCM. If it is a two wire connector with two wires in it---Then it is set up for a PCM PWM alternator and does need to go to the PCM.
The single green wire in a blue connector sounds like the temp sender wire for your gauge. There is also a two wire temp sensor that inputs to the PCM.
Jeff
Ok heres another dumb question. What torque converter do I need to use? I bought another transmission due to the one in my 98 being bad. (Thats how I got the truck so cheap) I am wanting to go with a higher stall speed and was told I can go with a v6 one but the one that came out of my truck is a B29 series any ideas on the other codes? I know this question has been asked several times but not by me. haha