I need help on 4.8 ls harness - LS1TECH - Camaro and Firebird Forum Discussion

Notices
Conversions & Hybrids LSX Engines in Non-LSX Vehicles
Sponsored by:
Sponsored by:

I need help on 4.8 ls harness

 
Old 01-06-2019, 09:29 PM
  #1  
Teching In
Thread Starter
 
Join Date: Jan 2019
Posts: 4
Default I need help on 4.8 ls harness

I have a donor 4.8 Vortec ls out of a 2000 Sierra. I知 swapping it to a 89 k1500. My question is when I swap the harness over can I just plug in the sensors I知 going to use and drive it like that or is taking the plugs off that I知 not using a must? Its only temporary for a couple of months until I turbo it and have one made. I知 new to running wiring harnesses In general so please help lol
Brandonie901 is offline  
Old 01-06-2019, 10:14 PM
  #2  
TECH Senior Member
 
Join Date: Jun 2016
Location: Central Cal.
Posts: 9,393
Default

The only reason to remove unneeded plugs is to make it neater. Otherwise just ziptie them out of the way. No big deal.
G Atsma is online now  
Old 01-07-2019, 05:21 AM
  #3  
Teching In
Thread Starter
 
Join Date: Jan 2019
Posts: 4
Default

Originally Posted by G Atsma View Post
The only reason to remove unneeded plugs is to make it neater. Otherwise just ziptie them out of the way. No big deal.

and the check engine light will be on rite?
Brandonie901 is offline  
Old 01-07-2019, 08:17 AM
  #4  
TECH Regular
 
Join Date: Dec 2017
Location: Bossier City, Louisiana
Posts: 409
Default

Also, don't forget - as a minimum, the Vehicle Anti Theft System (VATS) inside the 2000 Sierra powertrain control module must be disabled by somebody savvy with HP Tuners or similar. The engine will not start unless VATS is disabled.

Yes, the check engine light will also be on unless your HP Tuners guy disables the warnings for things like EGR and EVAP while he is inside your tune disabling VATS. The following is everything I had done to the software inside my PCM:

Startup and at temp Idle Raised 100 rpm
PE Delay set to zero - Power Enrichment

Cat Overtemp Disabled
All EVAP, EGR, Fuel Sender, and Rear O2 codes deleted
Speedo and shift points corrected for current tire/gear
Max line psi disabled in case of MAF failure
VATS turned off
Fans Activate - First fan on @ 195, second on at 210, both off at 190

Rick
B52bombardier1 is offline  
Old 01-07-2019, 11:34 AM
  #5  
Teching In
Thread Starter
 
Join Date: Jan 2019
Posts: 4
Default

Originally Posted by B52bombardier1 View Post
Also, don't forget - as a minimum, the Vehicle Anti Theft System (VATS) inside the 2000 Sierra powertrain control module must be disabled by somebody savvy with HP Tuners or similar. The engine will not start unless VATS is disabled.

Yes, the check engine light will also be on unless your HP Tuners guy disables the warnings for things like EGR and EVAP while he is inside your tune disabling VATS. The following is everything I had done to the software inside my PCM:

Startup and at temp Idle Raised 100 rpm
PE Delay set to zero - Power Enrichment

Cat Overtemp Disabled
All EVAP, EGR, Fuel Sender, and Rear O2 codes deleted
Speedo and shift points corrected for current tire/gear
Max line psi disabled in case of MAF failure
VATS turned off
Fans Activate - First fan on @ 195, second on at 210, both off at 190

Rick
ok. Do you know a good company that I can send it in to disable it?
Brandonie901 is offline  
Old 01-07-2019, 11:41 AM
  #6  
TECH Regular
 
Join Date: Dec 2017
Location: Bossier City, Louisiana
Posts: 409
Default

There are vendors here on the site that you can send your PCM to and they will make the required changes - its called a "mail order tune". You can also learn a lot about your wiring by visiting the site known as LT1Swap.

Rick
B52bombardier1 is offline  
Old 01-07-2019, 12:05 PM
  #7  
Teching In
Thread Starter
 
Join Date: Jan 2019
Posts: 4
Default

Ok thank you rick
Brandonie901 is offline  
 


Thread Tools
Search this Thread

About Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: