Help with EFI connection before start up
Thread Starter
TECH Enthusiast
iTrader: (4)
Joined: Dec 2005
Posts: 612
Likes: 0
From: Nashville, TN
Help with EFI connection before start up Im about ready to fire it up and need someone to look at my tune to see if I have it setup right. I changed the firing order in the tune but im wondering why since I followed these pinout diagrams and they show 4-7 and 3-2 being swapped when I repinned it to the PCM. So if I followed these diagrams do I still need to enter the SBC firing order or do i leave it LS1 because I swapped the pinouts? Im trying to firing it up TONIGHT so quick help would be great!
My tune file is to large but I can email it to anyone if they wnat to look at it and see if im safe to fire it up!
My tune file is to large but I can email it to anyone if they wnat to look at it and see if im safe to fire it up!
TECH Regular
Joined: Jan 2005
Posts: 456
Likes: 0
EFILive...
You can only change the injector to bank assignments (which is for closed loop fuel trims). This is not the same as firing order.
HP Tuners...
In their beta release they have the injector to bank assignment table.
Under Engine Diagnostics > General they have a Firing Order table (with no description for the table). Being under diagnostics, I would expect this to be related to misfire detection only, but they are leaving this up for interpretation and trial/error. Does this table really change the injector firing order? For both injectors and coils? Who knows? If it does, then HP Tuners is the only tuning software that allows the firing order to change at the calibration level.
LS1Edit...
Same as EFILive, but you may have to request the latest software update.
TunerCat OBDII...
Same as EFLive, but you may have to request the latest software update.
JET...
Not sure. I've not heard of anyone tuning with this equipment.
Here is how GM dealt with firing order and the 12200411 (LS1) PCM
The 24x systems (LS type engines) are pinned one way for injectors and 4x systems (Gen 1 SBC type engines) are pinned another way such that injectors 2&3 and 7&4 are swapped. In addition, GM changed the injector to bank assignment table (not the same as firing order) for proper closed loop operation. In other words, it's not wrong or a "hack" to change the firing order in the harness at the PCM. This is by (GM) design.
Recommendation
Compared to an LS1 PCM schematic (for example 2002 Camaro), swap injectors and coils 2&3 and 7&4, then update the injector to bank assignment table. Any doubts? Then copy/paste the 2002 5.7L Express Van injector to bank assignment table into your 24x LS type calibration.
You can only change the injector to bank assignments (which is for closed loop fuel trims). This is not the same as firing order.
HP Tuners...
In their beta release they have the injector to bank assignment table.
Under Engine Diagnostics > General they have a Firing Order table (with no description for the table). Being under diagnostics, I would expect this to be related to misfire detection only, but they are leaving this up for interpretation and trial/error. Does this table really change the injector firing order? For both injectors and coils? Who knows? If it does, then HP Tuners is the only tuning software that allows the firing order to change at the calibration level.
LS1Edit...
Same as EFILive, but you may have to request the latest software update.
TunerCat OBDII...
Same as EFLive, but you may have to request the latest software update.
JET...
Not sure. I've not heard of anyone tuning with this equipment.
Here is how GM dealt with firing order and the 12200411 (LS1) PCM
The 24x systems (LS type engines) are pinned one way for injectors and 4x systems (Gen 1 SBC type engines) are pinned another way such that injectors 2&3 and 7&4 are swapped. In addition, GM changed the injector to bank assignment table (not the same as firing order) for proper closed loop operation. In other words, it's not wrong or a "hack" to change the firing order in the harness at the PCM. This is by (GM) design.
Recommendation
Compared to an LS1 PCM schematic (for example 2002 Camaro), swap injectors and coils 2&3 and 7&4, then update the injector to bank assignment table. Any doubts? Then copy/paste the 2002 5.7L Express Van injector to bank assignment table into your 24x LS type calibration.
Thread Starter
TECH Enthusiast
iTrader: (4)
Joined: Dec 2005
Posts: 612
Likes: 0
From: Nashville, TN
If Im reading it right they are saying with swapping the injectors and coils at the PCM you dont need to change the firing order? and just update the injector bank assignment table so that 2&3 and 7&4 are swapped?? that seems almost to easy..
TECH Regular
Joined: Jan 2005
Posts: 456
Likes: 0
Thread Starter
TECH Enthusiast
iTrader: (4)
Joined: Dec 2005
Posts: 612
Likes: 0
From: Nashville, TN
badass! thanks again! lol since I swapped the PCM pinouts AND changed the firing order in the tune im back to an LS1 firing order lol need to change the tune and im set! boost and LT1's/SBC are new to me, what are you bosted guys running for timing? Im on E85
Thread Starter
TECH Enthusiast
iTrader: (4)
Joined: Dec 2005
Posts: 612
Likes: 0
From: Nashville, TN
Ok now im confused again.....
Recommendation
Compared to an LS1 PCM schematic (for example 2002 Camaro), swap injectors and coils 2&3 and 7&4, then update the injector to bank assignment table. Any doubts? Then copy/paste the 2002 5.7L Express Van injector to bank assignment table into your 24x LS type calibration.
Why am I changing the injector bank asignment from and LS firing order to an LT firing order?
LT1 Firing order 1-8-4-3-6-5-7-2
LS1 Firing order 1-8-7-2-6-5-4-3
Bank Assignment a-b-c-d-e-f-g-h
02 van bank asn 0-1-1-0-1-0-0-1
LS1 bank assign 0-1-0-1-1-0-1-0
Since im keeping the LS1 firing order in the PCM, the injector and coil wires for 7&4 and 2&3 are swapped at the pcm. wouldnt I want to keep the LS1 bank assignment?
LS1 Firing Order and LS1 injector assignent
0-0-0-0
1-7-5-3
1-1-1-1
8-2-6-4
LS1 Firing order with 2002 truck injector bank
0-0-0-0
1-2-5-4
1-1-1-1
8-7-6-3
The only way it makes sense to me is IF I only changed the coil pinouts and not the injector pinouts.
Recommendation
Compared to an LS1 PCM schematic (for example 2002 Camaro), swap injectors and coils 2&3 and 7&4, then update the injector to bank assignment table. Any doubts? Then copy/paste the 2002 5.7L Express Van injector to bank assignment table into your 24x LS type calibration.
Why am I changing the injector bank asignment from and LS firing order to an LT firing order?
LT1 Firing order 1-8-4-3-6-5-7-2
LS1 Firing order 1-8-7-2-6-5-4-3
Bank Assignment a-b-c-d-e-f-g-h
02 van bank asn 0-1-1-0-1-0-0-1
LS1 bank assign 0-1-0-1-1-0-1-0
Since im keeping the LS1 firing order in the PCM, the injector and coil wires for 7&4 and 2&3 are swapped at the pcm. wouldnt I want to keep the LS1 bank assignment?
LS1 Firing Order and LS1 injector assignent
0-0-0-0
1-7-5-3
1-1-1-1
8-2-6-4
LS1 Firing order with 2002 truck injector bank
0-0-0-0
1-2-5-4
1-1-1-1
8-7-6-3
The only way it makes sense to me is IF I only changed the coil pinouts and not the injector pinouts.
TECH Regular
Joined: Jan 2005
Posts: 456
Likes: 0
If you don't change the injector to bank assignments, the PCM is going to add/remove fuel from two incorrect injectors on each bank. The trims will go high on one bank and low on the other.
There were no mistakes in the information I posted above. Please use that information and then, if you are curious, data log in closed loop with the correct and incorrect injector to bank assignment table. I think that will help your understanding.
There were no mistakes in the information I posted above. Please use that information and then, if you are curious, data log in closed loop with the correct and incorrect injector to bank assignment table. I think that will help your understanding.
Trending Topics
Thread Starter
TECH Enthusiast
iTrader: (4)
Joined: Dec 2005
Posts: 612
Likes: 0
From: Nashville, TN
Ok got it to fire but now I cant get it to start again... heres a vid of the initial fire up.
Even when I got it fire last night it sounded off like it wasnt running on all cylinders... I rechecked the ignition coils and they are wired in the LT1 firing order. right now when I turn it over itll pop a couple times through the exhaust and then after a couple tries itll fire up for about 2 seconds then die and no amount of throttle will keep it going. its like VATS is killing it but I checked that 100 times and its turned off.... I watched the injector pulse width whille starting and it doesnt cut out or anything...
RPM seems low when Im cranking 125-140RPM? Ive got two batteries hooked up and a battery charger so voltage shouldnt be an issue...
What I really need is someones working timing and fuel tables for E85...... Id just liek to check and see if im going in the right direction.... the popping in the exhaust is really bothering me... its almost like the timing is off and its igniting the fuel on the exhaust stroke....
Even when I got it fire last night it sounded off like it wasnt running on all cylinders... I rechecked the ignition coils and they are wired in the LT1 firing order. right now when I turn it over itll pop a couple times through the exhaust and then after a couple tries itll fire up for about 2 seconds then die and no amount of throttle will keep it going. its like VATS is killing it but I checked that 100 times and its turned off.... I watched the injector pulse width whille starting and it doesnt cut out or anything...
RPM seems low when Im cranking 125-140RPM? Ive got two batteries hooked up and a battery charger so voltage shouldnt be an issue...
What I really need is someones working timing and fuel tables for E85...... Id just liek to check and see if im going in the right direction.... the popping in the exhaust is really bothering me... its almost like the timing is off and its igniting the fuel on the exhaust stroke....
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
