#1069076 - 01/04/21 09:56 PM
Re: 1987 MC SS LS2/4L60e swap
[Re: jmireles]
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Joined: Apr 2011
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Hunter79764
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Baby steps, baby steps... Troubleshooting is always fun. Good luck on getting it nailed down and fixed. I forgot another issue I had, where the screw terminal on the aftermarket fuse block was loose. It killed the fuel pump power and I think another circuit, might have been a feed to the ECM too. Might take a look there as well, depending on how your system is wired and routed. Don't forget wires that might be bumped by the steering shaft, or by the engine torquing differently when in reverse than in drive. Basically, anything that moves when you go to reverse. Even though that isn't causing it to stall, it used to and you still have the same problem with a different cause.
Shawn
'85 MC with budget 5.3L swap, TH350 with stock 2.14 rear end It ain't much off the line, but it's nice on the highway
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#1069298 - 01/19/21 02:17 PM
Re: 1987 MC SS LS2/4L60e swap
[Re: jmireles]
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Joined: Apr 2011
Posts: 1,259
Hunter79764
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Go-Pro's are awesome. You might look into a magnetic base for it. We use them for work, and built a handful of bases with some strong neodymium magnets and a 1/4"-20 screw stud for the mount to screw onto (with a locknut). We put a couple layers of tape on the magnet to make it easier to remove and easier to clean. On flat steel, it was almost impossible to budge. We launched them on barges dropping into the water, some of them getting hit full force with jets of water, others getting jolted 10g's and barely moving at all, but no drilling or gluing required to mount them. Tie a string on it just in case if you want an added layer of protection against losing it.
I was about ready to buy a knock-off GoPro before we bought a handful of them for work that I can use when needed... Anyway, sounds like a plan. Good luck.
https://smile.amazon.com/Mutuactor-Powerful-Neodymium-Threaded-Pull-Force/dp/B07JKWCVTX/ref=sr_1_5?dchild=1&keywords=magnet+stud+1%2F4-20&qid=1611065852&sr=8-5
Last edited by Hunter79764; 01/19/21 02:19 PM.
Shawn
'85 MC with budget 5.3L swap, TH350 with stock 2.14 rear end It ain't much off the line, but it's nice on the highway
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#1069561 - 02/14/21 02:42 AM
Re: 1987 MC SS LS2/4L60e swap
[Re: jmireles]
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Joined: Nov 2008
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jmireles
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El Paso, Tx
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I think I my have found a solution to the intermittent power supply problem. I'm going to run a wire from the battery directly to the PSI fuse box, bypassing the starter. I ordered a Fuse box/ECM cable for a '97 Silverado, as it bolts directly to the battery. It was supposed to have arrived yesterday but I wasn't in as of today. I then decided to replace the throttle cable because the one I installed with the swap was too long and tended to bind slightly, causing a jolt on initial acceleration. It can be a bit scary when driving in tight spaces. The cable I used was from a 2002 Trans Am without Traction Control. I also bought a cable bracket for an LS1 Fbody to mount on the intake manifold since I converted from DBW to DBC. I read several times where other guys that had LS swapped their Montes (or some other G body) used the Throttle cable from a 5.3 or 6.0 Silverado. It seems as though the cable has come up a bit short. Maybe the routing is wrong...maybe I need another cable bracket. Any thoughts or suggestions? Throttle Cable Bracket 1 by Jose Mireles, on Flickr
-'87 Monte SS LS 2/4L65e Quick Perf. 9" w/disk brakes -'89 Iroc Z28 Stock 5.7 Edelb. TES headers, Borla Exhaust90K -'77 Trans Am 468(Stroked) Doug's Headers Flowmaster catback B & M shift Kit 400 Turbo trans. Edel brock Performer RPM Intake Sean Murphy built Rochester Carb. Restored in '08. 3K
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#1069587 - 02/17/21 04:18 PM
Re: 1987 MC SS LS2/4L60e swap
[Re: jmireles]
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Joined: Apr 2011
Posts: 1,259
Hunter79764
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Grand Prairie, Tx
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I think I'd be looking at cable routing first. Is there a way to get that extra ~1 1/2"? Or is there a way to reroute the old (long) cable to loop a little more and not bind? Maybe just lube it with some white lithium or dry moly? I haven't ever tried to take one of these apart, might be easier said than done, but even if you can't get the cable out of the sleeve, sometimes you can make a slurry of rubbing alcohol and lube and it will get into tight places, then the alcohol evaporates and you have a lubed component. I haven't measured the distance between the cable bracket and the TB, but I would think GM would keep that consistent between models such that an LS1 bracket with a truck cable shouldn't be a problem so I wouldn't get too far on the bracket path. I used a rigged up cable extension on mine (trying to keep factory kickdown function on the TH350 as well as give a mounting point for cruise), otherwise I'd tell you what worked for me 
Shawn
'85 MC with budget 5.3L swap, TH350 with stock 2.14 rear end It ain't much off the line, but it's nice on the highway
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#1069596 - 02/19/21 12:34 PM
Re: 1987 MC SS LS2/4L60e swap
[Re: jmireles]
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Joined: Nov 2008
Posts: 647
jmireles
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El Paso, Tx
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Shawn, I lubed the cable with a little transmission oil. But that was 5 years ago. I ruined the cable by trying to remove it.  The Fbody cable bracket is different from the truck bracket too...I can make it work but not if it doesn't reach. I tried a couple of routing configurations, so perhaps I need to keep trying to find the correct way. I didn't get a whole lot of time to work on Saturday as we were preparing for last week's deep freeze. How did you fair this week?
-'87 Monte SS LS 2/4L65e Quick Perf. 9" w/disk brakes -'89 Iroc Z28 Stock 5.7 Edelb. TES headers, Borla Exhaust90K -'77 Trans Am 468(Stroked) Doug's Headers Flowmaster catback B & M shift Kit 400 Turbo trans. Edel brock Performer RPM Intake Sean Murphy built Rochester Carb. Restored in '08. 3K
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#1069653 - 02/23/21 04:54 PM
Re: 1987 MC SS LS2/4L60e swap
[Re: jmireles]
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Joined: Apr 2011
Posts: 1,259
Hunter79764
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Grand Prairie, Tx
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Not too bad in the scheme of it. Lost power for 24 hours, its an old house so it cooled off quick but with gas burners and a fireplace we kept it in the upper 40's. Froze my water heater (tankless outside), still waiting on replacement parts due last week. And sprung a leak in my RV fresh water tank, as well as in the pump. Looks like everything is going to come in this weekend to fix it all before I have to go out of town again Monday. A few others in our area had no power for 2-3 days, water either cut off or on boil notice, and a few friends had bad water damage from busted pipes. One family was volunteering at a warming center when power came on at their place and thawed a busted pipe, flooded entire downstairs for hours before they got home. Thankfully we had nothing like that.
How did you guys do?
Shawn
'85 MC with budget 5.3L swap, TH350 with stock 2.14 rear end It ain't much off the line, but it's nice on the highway
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#1069999 - 03/22/21 05:08 AM
Re: 1987 MC SS LS2/4L60e swap
[Re: jmireles]
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Joined: Nov 2008
Posts: 647
jmireles
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El Paso, Tx
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I figured out solutions to both of my dilemmas. 1) The power supply to the PCM: I removed the two PSI wires that bolted to the starter, ran them up top over the intake manifold and extended the wires directly to the battery. I noticed that the last six inches of wiring felt flimsy somehow...even had a different color of insulation, so those last 6 inches is what I cut off. Luckily, my battery has both side and top posts. The only thing needed to be finished is adding wire loom to make it look neatly and protect the wiring.
2) The accelerator cable: I ended up using a cable from a '98-'04 Chevy Blazer with the 4.3 V6.th only modification was trimming the plastic clip that secures to the accelerator bracket...that was it! Its almost as if though it was made for my swap!
Last edited by jmireles; 03/22/21 05:10 AM.
-'87 Monte SS LS 2/4L65e Quick Perf. 9" w/disk brakes -'89 Iroc Z28 Stock 5.7 Edelb. TES headers, Borla Exhaust90K -'77 Trans Am 468(Stroked) Doug's Headers Flowmaster catback B & M shift Kit 400 Turbo trans. Edel brock Performer RPM Intake Sean Murphy built Rochester Carb. Restored in '08. 3K
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