04 tahoe harness and ECM - Can I use?
05-21-2013, 02:11 PM
#1
Member
Thread Starter
iTrader: (1)
Join Date: May 2010
Location: Chickamauga, GA
Posts: 426
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 IROC-Z
Engine: 355ci SBC
Transmission: TH700R4 - 2500 stall
Axle/Gears: 3.70 9 bolt
04 tahoe harness and ECM - Can I use?
So I've hit a roadblock on my swap, well, somewhat of one. I have a 2004 5.3L LM7 that I'm installing into my 89 IROC. The tahoe uses a drive by wire throttle body, which I do not want to fool with. Having said that, is it possible, if I run an LS1 intake and cable driven throttle body, to still use the ECM and harness from the Tahoe?
I guess what I'm getting at is can it be tuned out of the computer or reflashed? I know I'll have to change the fuel injector wires over to the LS1 connectors but is there anything else I should be concerned with? I'm running the C5 vette accesssories on the motor as well.
Trying to do this on a budget, combine my stock L-98 harness with the truck harness myself. If its not possible then I'll buy a reworked LS1 harness and computer. Just wanted some opinions from some of you experienced swappers. Thanks
I guess what I'm getting at is can it be tuned out of the computer or reflashed? I know I'll have to change the fuel injector wires over to the LS1 connectors but is there anything else I should be concerned with? I'm running the C5 vette accesssories on the motor as well.
Trying to do this on a budget, combine my stock L-98 harness with the truck harness myself. If its not possible then I'll buy a reworked LS1 harness and computer. Just wanted some opinions from some of you experienced swappers. Thanks
05-21-2013, 09:05 PM
#2
Supreme Member
iTrader: (24)
Join Date: Jun 2005
Location: NC
Posts: 7,899
Likes: 0
Received 90 Likes
on
54 Posts
Car: 92 Firebird
Engine: Supercharged 6.0
Transmission: T56
Axle/Gears: 8.8 3.73
Re: 04 tahoe harness and ECM - Can I use?
Read the wiring threads laid out in the swap sticky at the top of the forum. You can use any LSx harness you like that way
05-22-2013, 06:27 AM
#3
Member
Thread Starter
iTrader: (1)
Join Date: May 2010
Location: Chickamauga, GA
Posts: 426
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 IROC-Z
Engine: 355ci SBC
Transmission: TH700R4 - 2500 stall
Axle/Gears: 3.70 9 bolt
Re: 04 tahoe harness and ECM - Can I use?
Got it, thanks Pocket
05-25-2013, 11:39 AM
#4
Supreme Member
iTrader: (4)
Join Date: Mar 2009
Location: Pepperell, MA
Posts: 3,079
Likes: 0
Received 3 Likes
on
3 Posts
Car: 1987 Trans Am
Engine: LQ9/L92
Transmission: 4L60E
Re: 04 tahoe harness and ECM - Can I use?
he may run into an issue with the pcm though, no? I thought some of the new models don't have the drivers necessary for the iac?
05-25-2013, 01:51 PM
#5
Supreme Member
iTrader: (24)
Join Date: Jun 2005
Location: NC
Posts: 7,899
Likes: 0
Received 90 Likes
on
54 Posts
Car: 92 Firebird
Engine: Supercharged 6.0
Transmission: T56
Axle/Gears: 8.8 3.73
Re: 04 tahoe harness and ECM - Can I use?
Maybe, but a $30 replacement PCM is a small item compared to the job of rewiring the harness
Heres a quick pass/fail for the PCM being compatible with DBC TBs
http://www.lt1swap.com/cable_conversion.htm
Heres a quick pass/fail for the PCM being compatible with DBC TBs
http://www.lt1swap.com/cable_conversion.htm
Thread
Thread Starter
Forum
Replies
Last Post
Billy Decker
Engine/Drivetrain/Suspension Wanted
0
09-04-2015 03:46 PM
