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| Installing the FAST EZ-EFI 2.0 Multi-Port Retro Kit in a 1987 Pontiac Fiero V6 (Page 6/8) |
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zkhennings
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MAR 02, 01:52 PM
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| quote | Originally posted by 82-T/A [At Work]:
The MegaSquirt most definitely does not use any machine learning, it's strictly a decision-tree model that references a fuel map (which you've defined) in accordance with variables it gets from the sensors.
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| quote | Originally posted by zkhennings:
"I think you will be happy with your choice though."
"No one is trying to convince you to use MS, but you are just misinformed about what you think it can do."
"Once again, in no way trying to tell you to run MS, but if other people read this thread I want to correct the misinformation."
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| quote | Originally posted by 82-T/A [At Work]:
For the love of God, please... the religious zeal with the Megasquirt community is just something I've never seen before. I'm sure it's an absolutely fantastic solution for someone who has the time to put in and set it up... but I do not want to have to build a harness, and program an ECM.
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82-T/A [At Work]
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MAR 02, 07:18 PM
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Alright... done! Doesn't that look pretty? I'm going to replace the original image in a couple of days, so all the places where people used that image, will have the correct updated one.
It will be particularly helpful to those who have to build a wiring harness completely from scratch. With the FAST system, literally every other existing GM sensor on the Fiero will connect to the harness they've supplied me. The only leads I'll need to mess with are the GBRE leads coming off the ignition control module. But I'll save that for another post when I've built the diagram for that. This one above is the stock Fiero ignition wiring, to the best I could find images and documentation in my 87 Fiero Service Manual.
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Spadesluck
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MAR 02, 08:17 PM
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That photo I would assume applies to the Caddy 4.9 setup as well since it's HEI?
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82-T/A [At Work]
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MAR 02, 08:30 PM
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| quote | Originally posted by Spadesluck:
That photo I would assume applies to the Caddy 4.9 setup as well since it's HEI? |
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Well, except for the plug firing order, my guess is that it's probably correct for all HEI-8 ignition systems... so the Caddy 4.9, the 3.8 V6, the 4.3 V6, etc. The only thing is, I noticed when I was looking at different diagrams and images... they don't all have the same wire colors. While I assume the pin-outs are going to be identical for this ICM across any application, there are sometimes other subtle changes with the ignition coil (single plug coil), and other things... so I decided to label it specifically for the Fiero since I was confident at least from that perspective.
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fieroguru
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MAR 02, 08:32 PM
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| quote | Originally posted by Spadesluck:
That photo I would assume applies to the Caddy 4.9 setup as well since it's HEI? |
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Probably not... the 4.9 has the HEI with coil in cap vs. remote mounted so the layout is different (and doesn't use a tach filter).
It also has an additional cam sensor inside to allow for sequential fuel injection, so instead of 4 wires coming from the inside of the distributor, there are 6.
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Spadesluck
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MAR 02, 08:33 PM
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Gotcha, makes sense. I will look at some diagrams for the Caddy 4.9 pinouts. I do like pictures though. 
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82-T/A [At Work]
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MAR 03, 07:36 AM
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| quote | Originally posted by Spadesluck:
Gotcha, makes sense. I will look at some diagrams for the Caddy 4.9 pinouts. I do like pictures though. |
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Easiest thing is to find out what kind of ICM you have, and then start searching for wiring diagrams for that specific HEI module.
If you know what year / model car your engine came from (referencing the VIN stamped on the block), you can then search for the PDF of the Technical Service Manual. It will have all the wiring diagrams. But... to your point, yes, I think the wiring diagrams are difficult to look at. Not complicated, but everything is crammed in there so it becomes hard to sometimes see what the text is referencing since it might be between multiple leads, and it's not always totally obvious.
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82-T/A [At Work]
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MAR 03, 07:47 AM
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OK... since I'll be replacing the ECM, the next step for me will be to determine what components of the car will be affected by a lack of ECM. My desire is to completely separate the two systems *COMPLETELY*. Our car obviously comes before the OBD2 and CAN-BUS days, so there's no BCM / Body Control Module. That means there are some things within our ECM that non-engine-management components may rely on.
I spent some time reading the service manual last night while I watched This Old House, and I've discovered a few things...
For the most part, the Fiero V6's accessories and non-engine components had the LEAST interaction with the ECM that I could see; however, the L4 version of the car had multiple systems that integrated with the ECM in one way or another.
I'll make a comprehensive list, but just rattling off a few things... for both engine types... automatic versus manual, the torque lockup converter switch is controlled by the ECM to some degree. Obviously with a manual transmission, you have none of that, so that's completely eliminated. As I'm converting to a 5-Speed Getrag also, that's not something I'll have to worry about personally, but will still document it.
For the 4-cyl (at least with 87), there were a few components which made some use of the ECM, it included the air conditioning system, fan control, and the cruise module. There were some other things as well, but I cannot remember.
For the V6, a couple of these systems were affected, but only in a tenuous manner because they simply referenced leads to providing support via error codes.
The best thing I figured out, is that all of the gauges, from the tach, speedometer, voltage, oil pressure, etc... worked independently of the ECM. I think Raydar said this earlier about the tach, so I can definitely confirm that. Not sure about the temperature, but I'm sure that's an easy solution if not. I'll put something together and post it, might as well include it for the 4 cyl as well... not sure why GM did it more complex for the 4-cyl. I know the 87-88 had DIS ignition, so maybe that had something to do with the change... but the V6's chassis could completely operate independently of the ECM... which is good news.[This message has been edited by 82-T/A [At Work] (edited 03-03-2023).]
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Trinten
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MAR 03, 08:32 AM
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82-T/A [At Work]
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MAR 03, 08:46 AM
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Definitely! Thank you!
One of the things I want to do is make use of the factory "Shift" light in the dash. Since my Fiero was originally an automatic, there is no bulb there, and the leads go to nothing. I also determined that the shift light is controlled by the ECM, which I am eliminating, so this will absolutely be helpful if I want to install a small module to control the shift light. I think the EZ-EFI 2.0 may already have a provision for controlling an external shift light, as does the 6EFI that I have, but I may choose to keep these things entirely separate.
Thanks!
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