Reverse firing order
#1
Reverse firing order
The one assumption that I did not verify was the sparkplug order (not the firing order). I assumed, incorrectly, that plug 1 was closest to the firewall, so the plugs and injectors are wired 1-A starting at the firewall and 4-D at the waterpump. Yes, I know. For some reason that was just in my head. I have beat myself up already.
I am hoping to verify my thinking about how to remedy it. I prefer to NOT unsolder and resolder the 8 wires (spark and injector).
I am thinking that,in theory, I can simple reverse the firing order in MS and all should fire correctly. Is there a flaw in that logic?
I am hoping to verify my thinking about how to remedy it. I prefer to NOT unsolder and resolder the 8 wires (spark and injector).
I am thinking that,in theory, I can simple reverse the firing order in MS and all should fire correctly. Is there a flaw in that logic?
#5
I think I see it now... "Firing order" is labeled A-H (could it be that corresponds to the Injector A-H)
Plug 1 is at the front, 4 at the rear.
Assuming firing order is 1432
Injector A correlates to Plug 1
Injector B correlates to Plug 4
Injector C correlates to Plug 3
Injector D correlates to Plug 2
Would that be more correct?
Plug 1 is at the front, 4 at the rear.
Assuming firing order is 1432
Injector A correlates to Plug 1
Injector B correlates to Plug 4
Injector C correlates to Plug 3
Injector D correlates to Plug 2
Would that be more correct?
#8
I love the internet... I copied that order from a forum post...LOL
Now it looks like I need to wire:
Injector A correlates to Plug 1
Injector B correlates to Plug 3
Injector C correlates to Plug 4
Injector D correlates to Plug 2
So from front to back wire the injectors as: A D B C
Hopefully that will be all that I have to do for right now... I was expecting up to 25% rewire to fix mistakes anyway...
Now it looks like I need to wire:
Injector A correlates to Plug 1
Injector B correlates to Plug 3
Injector C correlates to Plug 4
Injector D correlates to Plug 2
So from front to back wire the injectors as: A D B C
Hopefully that will be all that I have to do for right now... I was expecting up to 25% rewire to fix mistakes anyway...
#16
Timing?
That seems to help, I do appreciate everyone's help... Because my assumptions were totally off, I have lost a little bit of my confidence in my thought process.
So as I am not assuming anything, can you help me out with the initial timing... I have read the information below but have some questins...
Remove your injector fuse or otherwise ensure that no fuel will be injected so the engine cannot start.
From http://msextra.com/doc/ms3/checktiming.html:
Hook up your timing light and crank the engine.
Confirm that the timing is regular and that the reported advance matches the expected cranking advance.
If it does not then adjust your tooth#1 angle (trigger wheel) or trigger angle/offset (other spark modes.)
If the actual timing is more advanced than Megasquirt thinks, then increase the trigger angle/offset.
If adjustments of more than 10 degrees are required, making the change, Burn, key off and restart the engine..
Where do I find the "reported advance", is that the same as "trigger angle"?
The difference in the terminology is going to get me in the end. I understadn "retard" and "advance" but do not know which is a "+" and which is a "-" in TS.
So as I am not assuming anything, can you help me out with the initial timing... I have read the information below but have some questins...
Remove your injector fuse or otherwise ensure that no fuel will be injected so the engine cannot start.
From http://msextra.com/doc/ms3/checktiming.html:
Hook up your timing light and crank the engine.
Confirm that the timing is regular and that the reported advance matches the expected cranking advance.
If it does not then adjust your tooth#1 angle (trigger wheel) or trigger angle/offset (other spark modes.)
If the actual timing is more advanced than Megasquirt thinks, then increase the trigger angle/offset.
If adjustments of more than 10 degrees are required, making the change, Burn, key off and restart the engine..
Where do I find the "reported advance", is that the same as "trigger angle"?
The difference in the terminology is going to get me in the end. I understadn "retard" and "advance" but do not know which is a "+" and which is a "-" in TS.
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EricJ
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09-11-2021 11:10 PM