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Project LQ4 - V8 S10 - Sold.

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Re: Project LQ4 - V8 S10 - Wiring... Watch for sparks!

Scottydoggs said:
why we need a o/p sensor?
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90% of my desire to get it working is for the initial fire up. Remember, I swapped oil pans, pickup tube and added 10' of -10 AN hose. Gonna take a fair bit of cranking before it builds pressure for the first time. I'm not going to plug the coils in until I see the gauge move. Plus I just like knowing what my motor is doing.

Scottydoggs said:
you must be getting itchy by now.,,,so close, yet so close lol
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Oh buddy, I'm beyond anxious. Have to keep reminding myself to take my time. No shortcuts.

FordMan77 said:
So it can leak at the plug and drain the oil from the system when it fails?
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I don't recall that being an issue on the LS motors. Not like the 3800 anyway.

FordMan77 said:
I'd stick an electronic sending unit in it and run a small autometer gauge in the truck somewhere.
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Factory sending unit, factory gauge. We're golden! :th_thumbsup-wink:

Fivefingerdeathpunch said:
The LS V8's rarely if ever leak from the oil pressure sensor. Instead they just die.

I doubt I've ever seen one fail in the many years I've been working on vehicles and reading up on these motors.
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Is there an echo in here? LOL :th_biggrin3:

Fivefingerdeathpunch said:
Using the 4.3 sending unit on the other hand, couldn't tell ya if those suffer the same failures on the 3800 style.
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Now that I can't say for sure. I think I would have heard something, but you never know. Either way, it's plug and play for my application so I'm going to run with it. Well... I do need an adapter, but that not a big deal.
 


Re: Project LQ4 - V8 S10 - Wiring... Watch for sparks!

I was able to drop the rear off today. See it there?

IMAG1046_zpskwalkakl.jpg


Good news/bad news... Good news; It's going to be even cheaper than originally thought. Probably closer to $70 to narrow, clean and install a new pinion seal. Yay! Bad news; The gears are junk. He took one look and said "Your pinion is toast" Looks like it got run low on oil and got really hot. I asked him "Worst case scenario?" He said it would probably be loud and run hot. I said let's do it anyway. We'll call this a temporary rear. It'll give me a chance to see if 4:10 is what I really want or if I should look for a 3:73 set.

Got back to wiring. I'm stabbing pins now.

IMAG1047_zps2peamiva.jpg


I need to grab some oil and trans fluid. Gonna need it soon!
 
Re: Project LQ4 - V8 S10 - Wiring... Watch for sparks!

99% of the wires are home. Need to make a couple just a little bit longer. Output speed sensor and high side AC switch IIRC. I can bump the starter with the key now. Hehehe! I've decided not to "finish" the harness until I have driven it for a while. Make sure there's no major gremlins hiding in there.

IMAG1053_zpsudp09usw.jpg


Going to try my hand at drilling the axles myself.

IMAG1048_zpsbzu2mx8g.jpg
 
Re: Project LQ4 - V8 S10 - Wiring... Watch for sparks!

100% of the wires are pinned, including a few extra. Tach, performance mode and two cooling fans. Before I screwed the connectors down, I bumped the pin for the fuel pump relay with the power probe. Holds pressure, didn't see/smell any leaks.

IMAG1060_zps0rpaeyf4.jpg


Then I screwed both connectors down, and hit the key. I was stoked when it didn't pop any fuses! Just like that... I have serial data connection!

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The truck didn't come with an owners manual, so I'm starting a new one. Ha!

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Fuel gauge is maxed out with key on. I'm thinking I lost a needed ground when I deleted some of the connectors under hood near the brake booster. There's a couple pins in the PCM that pertain to "fuel level" so that is also a possible cause. I need to study some wiring diagrams. Maybe even make a post somewhere.
 


Re: Project LQ4 - V8 S10 - So close to making noise...

I think that did it! I dug the fuel buffer module out from under the glove box, checked for ground on pin "M". Sure enough, nothing. Traced it back to pin 12 from the black connector on the old PCM. There it was, just hanging in the wind. It was one of four orphaned wires leftover after re-pinning the LQ4 computer.

IMAG1061_zpsnjfgy0hs.jpg


Soldered a jumper from it to one of the leftover ground leads in the harness and viola! Working gas gauge. At least I think it works. It's not stuck on full anymore, and I seem to recall it being very low on fuel when I pulled it in the garage. I guess I won't be completely sure until I pull away from the pump for the first time.

IMAG1063_zpssiehqsi4.jpg
 
Re: Project LQ4 - V8 S10 - So close to making noise...

Hilarious that my box truck has the same dash setup.
 
Re: Project LQ4 - V8 S10 - So close to making noise...

You could pour in 5 gallons and test that way. Being that low and knowing you'll run for a while before a gas station is a consideration.....just saying.

Diagnosing no fuel in the tank is no fun as you are looking at all other culprits too.
 
Re: Project LQ4 - V8 S10 - So close to making noise...

BillBoost37 said:
You could pour in 5 gallons and test that way. Being that low and knowing you'll run for a while before a gas station is a consideration.....just saying.
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There's certainly no downside to doing that. I'm currently on the hunt for a decent tow dolly. It'd be nice to actually pull it up to a pump. Gotta pull it to the exhaust shop then the emissions testing place anyway. Can't be registered until I pass emissions.
 


Re: Project LQ4 - V8 S10 - So close to making noise...

thats crazy, here it needs to be registered and insured then it can be taken to be inspected.
 
Re: Project LQ4 - V8 S10 - So close to making noise...

Scottydoggs said:
thats crazy, here it needs to be registered and insured then it can be taken to be inspected.
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Yup. Emissions testing. Don't get me started... To be clear, I can get it insured anytime, but to get my plates/registration I need to pay my $12.50, and get a piece of paper. You can get a 3 day pass that allows you to drive an unregistered/untested vehicle to and from the emissions testing place only. No getting gas or running errands. To and from testing place only. Unfortunately, I'll need a full exhaust system before I can even get inspected. That's not going to be for a while anyway. Everyone is sold out of my 2-1/2" high flow not cat.
 
Re: Project LQ4 - V8 S10 - So close to making noise...

truth is, here you need insurance before they will register it lol then feel free to take up to 30 days if, and only if the sticker is expired. if its good you dont go till its time is up. here thats every two years.

you cant leave a new car dealer even with the temp plate with out a full policy thats been faxed over to them from your agent if its got a loan, if you pay cash they dont really give a crap no more, but by law, its supposed to be insured.
 
Re: Project LQ4 - V8 S10 - So close to making noise...

Sitting here thinking about the fan wiring... I'd like to run both at the same time in a Low/High configuration vs. one on for low and both on for high. I'll be using the PCM as the fan controller. I found this diagram. To my feeble brain, it looks plausible.

Fan_Relay_Wiring_zpsw85ctqbx.png


So, wiring guru's... Does this look right? I'd probably also add some 30 amp fuses off the 87 pins.
 
Re: Project LQ4 - V8 S10 - So close to making noise...

Very good site if you ever need to understand how something works. And since a few here may not fully understand a 5 pin relay super well. Here's a link to the info that explains why on low.. it can feed from 87a to 87
http://www.the12volt.com/relays/relays.asp

Brandon, I would go snag some weatherproof relays off a 92-99 big body GM with a under hood relay center. Like the Bonneville, which had two relays for the fans with 10 gauge going all the way to the fans.

Instead of the diagram above..you could probably just tell the pcm (if you are doing HPT, tell me what year truck pcm and I can look) to turn on both all the time anyhow. So only 2 relays. Or you could use one relay and two diodes. Hook both trigger wires to their own diode and then to the one relay trigger pin. A diode is a one way switch, so nothing would flow back on the wrong wire and piss off the pcm.

let's just say... wiring, it's my friend. If I can help.. let's chat more.
 


Re: Project LQ4 - V8 S10 - So close to making noise...

Here's a pic of the weather proof relay situation.



The two relays you'd want would be the two furthest to the driverside. One has a light blue and I forget the other .. but you'll know them by the 10 gauge power wire. Plus.. they'll be connected to a fuse.
 
Re: Project LQ4 - V8 S10 - So close to making noise...

BillBoost37 said:
Very good site if you ever need to understand how something works. And since a few here may not fully understand a 5 pin relay super well. Here's a link to the info that explains why on low.. it can feed from 87a to 87
http://www.the12volt.com/relays/relays.asp
Click to expand...

I think I'm good on the relay stuff. Did a bunch of learnin' when I built the block for the key on 12v stuff in the harness.

Brandon, I would go snag some weatherproof relays off a 92-99 big body GM with a under hood relay center. Like the Bonneville, which had two relays for the fans with 10 gauge going all the way to the fans.
Click to expand...

I don't hate that idea, but I already have a Doorman fuse block and 3 relays leftover from a 5-pack I got from Amazon. Might as well use what I have on hand.

Instead of the diagram above..you could probably just tell the pcm (if you are doing HPT, tell me what year truck pcm and I can look) to turn on both all the time anyhow. So only 2 relays. Or you could use one relay and two diodes. Hook both trigger wires to their own diode and then to the one relay trigger pin. A diode is a one way switch, so nothing would flow back on the wrong wire and piss off the pcm.
Click to expand...

I do have HPTuners, and I see the 411 PCM does have the ability to control 2 separate fans, at two separate temperature ranges. In fact, I already have the two wires pinned and ran. I really like the idea of running both at the same time either on low or high.

I see a couple advantages of doing it this way; With both running on low, you get as much, or maybe more airflow over the whole radiator with substantially less noise. Those things scream when they're running full tilt. I have to imagine they will spend 75% of the running time in low speed.

let's just say... wiring, it's my friend. If I can help.. let's chat more.
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I was hoping you'd chime in. At this point, I'm just looking for a confirmation of that diagram. I can "paint by numbers" if I have a diagram I trust. Not really ready to go venture off on my own yet. :p

BillBoost37 said:
Here's a pic of the weather proof relay situation.



The two relays you'd want would be the two furthest to the driverside. One has a light blue and I forget the other .. but you'll know them by the 10 gauge power wire. Plus.. they'll be connected to a fuse.
Click to expand...

I may snag one of those if I see it. This won't be the last LS swap I do, and I could see a use for that...
 
Re: Project LQ4 - V8 S10 - So close to making noise...

Diagram would work. No doubt there, I looked it over and it makes perfect sense.

On those relays.. think where I live. Here...anyone that does a headlight kit and the relay is partially exposed, soon enough the headlights don't work. Pull the relay and it's a crusty rusty mess. Once you solder in a weatherproof one, you never see another problem. Now.. where you live, rain isn't common and neither is corrosion. I bet you are fine with that dorman box.
 
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Re: Project LQ4 - V8 S10 - So close to making noise...

hang on a sec..

trigger low speed and you get fan 1 only
trigger high speed and you get both fans
 
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