How to mount ECM - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CJ2A · 10-06-2019, 12:36 PM

I am at a point where I need to mount the ECM in this 1963 GMC. My LS1, computer, wire harness, and gas pedal are out of a 2005 Chevy pickup.

Can anyone send photos of where to mount the stock computer for an
LS1 swap ? I am looking for the best location everyone else may have found by trial and error

How about photos of how to mount the fire by wire pedal ?

Where did you have the wiring harness penetrate into the cab ?

Thanks

**nsb29** · 10-06-2019, 09:24 PM

You need to go to engine and drivelines then click on LS swap. I put mine under the seat, some people put it on the inside of the firewall others put it on and inner fender

88Stanger · 10-07-2019, 09:32 AM

In my "69 I put it under the radio on the floor, then made a small console to cover it.

loosenutz · 10-07-2019, 11:09 AM

It can go pretty much anywhere you want. The problem with a lot of the truck engine harnesses though is that they are pretty short. You probably won't be able to get it inside the cab without extending the wires. I plan to put mine on the firewall. Really no reason not to, except for cosmetics.

**mongocanfly** · 10-07-2019, 01:35 PM

Under seat if possible....behind dash is 2nd option

**truckdude239** · 10-08-2019, 11:38 PM

The computer mount off an 2003 s10 zr2 also fits out computer nice and has hole for 3 bolts

**bigmoe** · 10-12-2019, 01:46 PM

My reworked stock wiring harness (Gen IV 5.3L) is too short for anywhere but on the driver side inner fender of my 65 C10. I plan to try to run my air intake to the drivers side and I'm thinking that the air filter will cover it a bit so it's less noticeable. At least the Gen IV ECM is smaller in size.

**Gregski** · 10-13-2019, 10:56 AM

this is on my square but I re routed all the wires, shortened them, re pinned them, and kept the PCM in the engine compartment on the driver side inner fender, you can also see my DIY fuse block behind it on the firewall - if I recall correctly the injectors have the shortest wires so they will dictate the final resting place of the PCM but no wires needed lengthening - I did buy some proper tools to help unpinning and crimping the PCM connectors

**First c10** · 10-16-2019, 05:39 PM

Post 787.
I kept mine in the engine bay behind the driver headlight area. I moved the horns to the passenger side.

http://67-72chevytrucks.com/vboard/s...659275&page=32

Flubyu · 10-21-2019, 12:41 PM

I had my truck harness lengthened to allow me to put the PCM under the seat. As for the pedal mounting, I would HIGHLY recommend buying the pedal bracket that a fellow member here sells in the LSX classifieds. Top notch.

Flubyu · 10-21-2019, 12:41 PM

http://67-72chevytrucks.com/vboard/s...d.php?t=651123

10-06-2019, 12:36 PM	#1
CJ2A Registered User Join Date: May 2019 Location: Hathaway Pines, CA Posts: 120	How to mount ECM I am at a point where I need to mount the ECM in this 1963 GMC. My LS1, computer, wire harness, and gas pedal are out of a 2005 Chevy pickup. Can anyone send photos of where to mount the stock computer for an LS1 swap ? I am looking for the best location everyone else may have found by trial and error How about photos of how to mount the fire by wire pedal ? Where did you have the wiring harness penetrate into the cab ? Thanks

10-06-2019, 09:24 PM	#2
nsb29 Senior Member Join Date: Feb 2014 Location: new smyrna beach fl / 29 palms cal Posts: 1,727	Re: How to mount ECM You need to go to engine and drivelines then click on LS swap. I put mine under the seat, some people put it on the inside of the firewall others put it on and inner fender __________________ Hand made A/C vent manifolds for 64-66 trucks adapts any aftermarket A/C to OEM vent Last edited by nsb29; 10-12-2019 at 07:14 PM.

10-07-2019, 09:32 AM	#3
88Stanger Registered User Join Date: Mar 2015 Location: Washington State Posts: 1,644	Re: How to mount ECM In my "69 I put it under the radio on the floor, then made a small console to cover it.

10-07-2019, 11:09 AM	#4
loosenutz Registered User Join Date: Jul 2019 Location: San Diego Posts: 73	Re: How to mount ECM It can go pretty much anywhere you want. The problem with a lot of the truck engine harnesses though is that they are pretty short. You probably won't be able to get it inside the cab without extending the wires. I plan to put mine on the firewall. Really no reason not to, except for cosmetics. __________________ 1966 C10 SWB BBW LM4 4L60E Build 1966 Pro Touring Chevy II Build

10-07-2019, 01:35 PM	#5
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,583	Re: How to mount ECM Under seat if possible....behind dash is 2nd option __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

10-08-2019, 11:38 PM	#6
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: How to mount ECM The computer mount off an 2003 s10 zr2 also fits out computer nice and has hole for 3 bolts __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

10-12-2019, 01:46 PM	#7
bigmoe Senior Member Join Date: Oct 2014 Location: Brandon, Manitoba, Canada Posts: 952	Re: How to mount ECM My reworked stock wiring harness (Gen IV 5.3L) is too short for anywhere but on the driver side inner fender of my 65 C10. I plan to try to run my air intake to the drivers side and I'm thinking that the air filter will cover it a bit so it's less noticeable. At least the Gen IV ECM is smaller in size. Last edited by bigmoe; 10-13-2019 at 07:34 PM. Reason: Damn autocorrect

10-13-2019, 10:56 AM	#8
Gregski Post Whore Join Date: Aug 2014 Location: Sacramento, CA Posts: 10,803	Re: How to mount ECM this is on my square but I re routed all the wires, shortened them, re pinned them, and kept the PCM in the engine compartment on the driver side inner fender, you can also see my DIY fuse block behind it on the firewall - if I recall correctly the injectors have the shortest wires so they will dictate the final resting place of the PCM but no wires needed lengthening - I did buy some proper tools to help unpinning and crimping the PCM connectors Attached Images

10-16-2019, 05:39 PM	#9
First c10 Senior Member Join Date: Dec 2012 Location: Los Banos CA Posts: 2,705	Re: How to mount ECM Post 787. I kept mine in the engine bay behind the driver headlight area. I moved the horns to the passenger side. http://67-72chevytrucks.com/vboard/s...659275&page=32 __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

10-21-2019, 12:41 PM	#10
Flubyu Registered User Join Date: Mar 2017 Location: Clever, Mo Posts: 69	Re: How to mount ECM I had my truck harness lengthened to allow me to put the PCM under the seat. As for the pedal mounting, I would HIGHLY recommend buying the pedal bracket that a fellow member here sells in the LSX classifieds. Top notch. __________________ '71 C-10 SWB Shop Truck Currently 350/350, soon to be LS'd.

10-21-2019, 12:41 PM	#11
Flubyu Registered User Join Date: Mar 2017 Location: Clever, Mo Posts: 69	Re: How to mount ECM http://67-72chevytrucks.com/vboard/s...d.php?t=651123 __________________ '71 C-10 SWB Shop Truck Currently 350/350, soon to be LS'd.



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