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| Third Gen Camaro Firewall ECM Pass-thru Location (Page 1/1) |
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Raydar
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OCT 23, 02:06 PM
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I'm looking at doing a 7730 on my 4.9, and thinking about using a salvaged TPI SBC harness. The only question I have, at the moment, is whether the wires will be long enough to reach from the Fiero engine bay into the interior. (Or how much I may have to coil up and hide.  ) I am planning on disassembling and re-looming the harness, but I don't want to cut/splice any wires that I don't have to.
Has anyone ever tried this? As many TPI 350s as I've seen in Fieros, it sounds reasonable.
More specifically, where is the firewall pass-thru on the 90-92 Camarobird?
Thanks!
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fieroguru
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OCT 23, 05:57 PM
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The 3rd gen ecm is in the passenger footwell location. This means the harness exits the the opposite corner of the engine bellhousing than what would be ideal in a Fiero.
It isn't difficult to cut the wires and crimp the ecm pins on. Doing this makes the harness as thing and tidy as possible w/o having to do a lot of cutting and splicing of wires.[This message has been edited by fieroguru (edited 10-23-2021).]
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Raydar
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OCT 24, 12:21 PM
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| quote | Originally posted by fieroguru:
The 3rd gen ecm is in the passenger footwell location. This means the harness exits the the opposite corner of the engine bellhousing than what would be ideal in a Fiero.
It isn't difficult to cut the wires and crimp the ecm pins on. Doing this makes the harness as thing and tidy as possible w/o having to do a lot of cutting and splicing of wires.
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Cool. Thanks for that.
I've been pricing wire and connectors and crimp tools, and it looks like I could buy a Painless harness for less money than I'd spend on supplies. Or I could buy a used harness for probably even less than that. (I found one sort of local to me.)
What are your thoughts?
(I should add that someone suggested that if I built my own, and it worked out well, that I could probably sell more, for various configurations.)
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fieroguru
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OCT 24, 06:43 PM
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I normally start with a stock OEM harness, then depin the ecm connector and rework the harness and bring all wires back to the ECM. Then trim the excess, crimp on the new ECM pins. The pins are pretty cheap and the crimpers are not bad (you don't need the super expensive ones), just takes more time than most want to commit to the project.
With the time it takes + all the variations in sensor/connector styles, accessory version and placement, and the owners preferred routing of the harness, very few harnesses are exactly the same. Add to that the lack of control on condition of the engine, sensors, components that the harness is placed on... if it doesn't fire up on the first key turn, the harness is one of the first items on the suspect list, so the harness provider has to be part of the troubleshooting until the harness is proven to not be the issue. Just something to think about before jumping into the custom harness provider game.
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OldsFiero
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OCT 25, 07:50 AM
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I have worked on many customers cars that had Painless harnesses on them. Having had to track down problems due to poor crimps and other issues, I am less than impressed with the quality. I have referred to them as Painful Wiring for a long time. Look for a clean used harness that hasn't been too molested.
Marc
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Raydar
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OCT 26, 08:46 PM
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Once again... Thanks gentlemen.
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