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-   -   I need help on 4.8 ls harness (https://ls1tech.com/forums/conversions-hybrids/1912957-i-need-help-4-8-ls-harness.html)

Brandonie901 01-06-2019 09:29 PM

I need help on 4.8 ls harness
 
I have a donor 4.8 Vortec ls out of a 2000 Sierra. Iím swapping it to a 89 k1500. My question is when I swap the harness over can I just plug in the sensors Iím going to use and drive it like that or is taking the plugs off that Iím not using a must? Its only temporary for a couple of months until I turbo it and have one made. Iím new to running wiring harnesses In general so please help lol

G Atsma 01-06-2019 10:14 PM

The only reason to remove unneeded plugs is to make it neater. Otherwise just ziptie them out of the way. No big deal.

Brandonie901 01-07-2019 05:21 AM


Originally Posted by G Atsma (Post 20026550)
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?

B52bombardier1 01-07-2019 08:17 AM

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

Brandonie901 01-07-2019 11:34 AM


Originally Posted by B52bombardier1 (Post 20026670)
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?

B52bombardier1 01-07-2019 11:41 AM

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

Brandonie901 01-07-2019 12:05 PM

Ok thank you rick


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