Firewall Plug
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Trailering
Joined: May 2016
Posts: 23
Likes: 0
From: Florida
Firewall Plug
Does anyone happen to have an extra firewall ecu harness grommet laying around? The part number should be something like E3DZ-14603-A I believe. I just finished an hei conversion on my 86 and I'm looking to clean up the engine bay. I can't seem to find one of these anywhere and it's getting harder and harder to find these trucks in the yards around me.
Cargo Master
Joined: Mar 2008
Posts: 2,560
Likes: 206
From: Washington
Does anyone happen to have an extra firewall ecu harness grommet laying around? The part number should be something like E3DZ-14603-A I believe. I just finished an hei conversion on my 86 and I'm looking to clean up the engine bay. I can't seem to find one of these anywhere and it's getting harder and harder to find these trucks in the yards around me.
Here's a photo of one. Someone poked some small holes in it.
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Moderator
Joined: Jan 2001
Posts: 56,949
Likes: 2,718
From: Virginia
Definitely keep the cab sealed. Some gorilla tape, duct tape or something like that should do the job. Or take the old one with the hole in it, patch the hole with something and then put the old grommet back in.
Last edited by Franklin2; Feb 16, 2026 at 07:08 AM.
Tuned
Joined: Apr 2024
Posts: 253
Likes: 46
Does this plug fit?
https://www.steelerubber.com/firewall-plug-20-0754-20
I forget if I got that part # from here or a facebook group, but I ordered some of those plugs. In my case I was replacing the plug in the firewall near the steering column. These worked and fit great.
https://www.steelerubber.com/firewall-plug-20-0754-20
I forget if I got that part # from here or a facebook group, but I ordered some of those plugs. In my case I was replacing the plug in the firewall near the steering column. These worked and fit great.
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Trailering
Joined: May 2016
Posts: 23
Likes: 0
From: Florida
This look pretty close and the measurements are close enough. I'm gunna order one and give it a shot, thanks!
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Tuned
Joined: Apr 2024
Posts: 253
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Hope it works for you, glad I could finally be a helper on this board. I've gotten so much help it feels good to finally pay it back, if even in a small way!
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Trailering
Joined: Nov 2020
Posts: 21
Likes: 4
From: Hot Springs National Park
I'm needing the same grommet for my computer delete that I did. What's the info I need to get one??
I need the same thing for my computer delete. What's the info I need to get my hands on one???
Trailering
Joined: Nov 2020
Posts: 21
Likes: 4
From: Hot Springs National Park
Solid firewall plug to seal up the ecm wiring that I deleted.
I also need a solid grommet to replace the ecm wiring that I deleted.
Lead Driver
Joined: Apr 2002
Posts: 5,240
Likes: 1,222
Last edited by BigBlue2; Mar 2, 2026 at 08:55 PM.
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