|
![]() |
#1 |
Member
Join Date: Nov 2002
Location: Potomac,IL
Posts: 269
Likes: 1
Liked 49 Times in 15 Posts
|
![]()
I have a 2001 GMC 2500 HD, the ECM isn’t sending a pulse signal to the #4 injector. So I need to purchase a new ECM I am assuming. Anyone have experience upgrading the ECM on these 8.1 chevys for more performance for towing?
__________________
Monte Howard 3209 STK, 3208 SS |
![]() |
![]() |
![]() |
#2 |
Junior Member
Join Date: Jan 2022
Posts: 17
Likes: 39
Liked 32 Times in 9 Posts
|
![]()
You should check for continuity between the injector plug in and the corresponding pins on the ecm plug in to make sure there isn't a break in the wiring somewhere. Hate to put in a new computer and it does the same thing. Have seen a broken wire or a mouse damaged one before.
|
![]() |
![]() |
![]() |
#3 | |
VIP Member
Join Date: May 2006
Location: Murfreesboro TN
Posts: 4,945
Likes: 1,029
Liked 1,119 Times in 294 Posts
|
![]() Quote:
A little late to the game here. It's pretty rare to drop a single injector driver in the ECM. Usually there's an attending wiring or injector problem, or both. The factory tune is woefully bad, there's no ignition timing, and the fuel mixture response is intentionally delayed. There's a significant amount of power and fuel economy there. Especially combined with a good exhaust system. That does not mean it has to be loud. The 8.1 responds to tuning, and free flowing exhaust, the performance restriction, however, is the intake manifold itself, and the camshaft, there are people who modify the intake, and Comp has a good cam for it, and it can be converted to adjustable valvetrain. I'd suggest you search the Duramax forums, and the Silverado forums.
__________________
Alan Roehrich 212A G/S |
|
![]() |
![]() |
![]() |
|
|