Obs ls swap wiring

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Obs ls swap wiring

Show 40 post s from this thread on one page Page 1 of 15 1 2 3 Last Jump to page:. Starting this to answer as many questions as I can in one place. I am trying to compile the most complete list of what to do to complete a conversion as I possibly can.

I am only a man so don't blame me if I forget something.

Upgrading to Gen III LS-Series PCM: Cruise Control Guide

I will work on this slowly as time allows. Let me know if I forget something. Drinking lots of beer just goes without being said. Publisher Cartechbooks. Publisher Penguin. A good read if you want to do a stroker Most places will do it for free, they keep the gas and re-use it. That pays for the labor of reclaiming it. Remove OBS engine and transmission as one piece Step 1 is to set the parking brake.

Step 2 is to have the battery disconnected. I prefer to remove it from the vehicle to prevent shorts. Don't set it on concrete for too long unless you just want to buy a new battery. Remove exhaust system from factory exhaust manifolds. Do not discard, old cats are valuable. Take them to the recycler to recover some funds.

Remove air intake system. Drain all fluids coolant, transmission fluid and oil. Leave old oil filter in place. Remove all electrical connections from old engine. Go ahead and label them if you know where they came from.

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Remove upper and lower radiator hoses.All Gen III vehicles were available with cruise control. Engines with a cable-actuated throttle body require an electronic cruise control module with an internal stepper motor to pull and release a throttle cable to maintain vehicle speed.

Engines with an electronic throttle body rely on the TAC module to increase and decrease throttle blade angle to maintain vehicle speed.

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Early cruise control systems took control of the throttle blade angle through a vacuum-operated actuator that pulled and released a throttle cable. The actuator relied on engine vacuum for operation. Early cruise control systems have a lag response to driver commands. Making cruise control performance worse is an aged diaphragm that has developed a leak and no longer operates properly. Electronic throttle systems use a TAC module rightwhile cable throttle systems use a cable-driven cruise control module left.

The TAC module is wired to a motor mounted within the throttle body assembly and uses PCM data to change throttle angle to maintain cruise control vehicle speed.

The cable throttle cruise control module shown here also uses PCM data to maintain cruise control vehicle speed, but must manually pull the throttle linkage to change throttle angle. Newer cruise control systems abandoned the vacuum actuator for an electronic module with an internal stepper motor to pull and release a throttle cable to maintain vehicle speed.

These systems have a better performance feel than the old vacuum-type systems. The required components of the cruise control system, however, have not changed much. To install a GM cruise control module for your cable throttle system, several components are required.

Most of them, such as cruise control switches, clutch switch, and brake switches, may already be in your car. Any missing components can either be sourced from a salvaged GM vehicle or through the aftermarket. Early GM systems used a vacuum-controlled actuator to pull a throttle cable.

GM LS Engine Swap Wiring You Can Do at Home

These systems require a VSS most commonly a 2,pulseper- mile signal to maintain cruise control vehicle speed. Rather than using an internal motor like the newer cable-driven cruise control modules, these early units use engine vacuum to control a diaphragm that pulls a throttle cable. This newer GM cruise module assembly contains a circuit board for processing cruise control logic, an internal motor to operate a worm-driven gear, and a short braided strap to pull the throttle cable. This cruise control module uses PCM data to control the movement of the throttle cable when cruise control is active.

The aftermarket offers several types of cruise control switches for different steering column configurations. If you cannot identify one to suit your application, you could make your own set of dash or center console mounted switches.

Cruise control modules compatible with Gen III conversions are plentiful. You may choose from cruise control modules found in newer Vortec trucks and LS series vehicles.

Installation is rather simple. An optional cruise engaged status signal is available for communication between the PCM and cruise control module. Not all aftermarket cruise control switches provide the signals required by the GM systems.

Notice the PCM cruise status and cruise inhibit signals are only required for — Camaro and Firebird cruise control modules.We have always wanted to build a sport truck, and with the popularity of these trucks coming back, now was the perfect time. At the moment, these trucks are relatively cheap to pick up, and can be found with full power, AC, tilt, etc.

For the base of our project, we started with a C truck that we purchased locally. Our intention was to see how inexpensive we can do the swap, and kept record of most costs. By using as many parts from the donor Yukon, we were able to keep cost down and give it a more factory look. Almost as if the truck came with a LS. At the end of this article, we will breakdown the cost we incurred, which covers most items, and maybe just missing a few misc.

The engine is a 5. The first tasks were to clean up the engine, and do some preventative maintenance to it, knowing it has over K miles. Plus, it is easier to work on them out of the truck and do these things now, rather than later. We stripped the complete harness off the engine. Thermostat: Motorad Knowing we will have AC in the truck and re-use most all that is there, we needed a bracket for the compressor. All other accessories were used from the Yukon.

We turned to Dirty Dingo for the AC bracket, which mounts it up on the passenger side, same area as the factory compressor.

obs ls swap wiring

We could have used the R4 compressor that originally came with the truck, but decided to replace it with a new Sanden No need for new hoses or anything, which kept costs down and made the process that much easier. To adapt to the factory vacuum booster on the truck, we needed to get a vacuum port fitting to go into the back of the manifold.

Some LS engine will have this blocked off, like ours did. This barbed fitting is a AC Delco part, Each harness is built from scratch specifically for your engine and vehicle combination. In most cases a Direct-Fit harness will allow you to retain all of the factory vehicle functions and gauges when doing an engine swap.

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The main difference between our Direct-Fit custom harnesses and a standalone engine management harness is that the custom harness is exactly that… meaning it is built custom for your application. The standalone engine management harness is cheaper because it is designed to do nothing except run the engine, and supply any necessary signals such as speedometer and tachometer.

The custom harness is built to include all of the functions that your vehicle will use, such as any factory gauges that can be used, any connectors that go to or through the firewall, relays to control the fans via the computer, and we will utilize the factory Neutral Safety switch if possible.

A Direct-Fit custom harness from Current Performance Wiring contains all of the electrical connections that are required for the vehicle that the engine is being installed in.

All fuses that are not in the vehicle already are included in the complete custom harnesses as well. This harness is not only designed to plug right in to the project vehicle and engine, but since they are completely built from scratch, they can be made to your specs.

If you are going for a clean install and want the ECU inside the passenger compartment, or all the way back in the trunk, we can make it exactly how you need. Direct-Fit Custom Harnesses come covered in standard OE split loom but optional Braided loom is available for an extra charge. Also prepped for Electric Fans. The truck had a 4. However, the 4.

So a new harness was built and routed so all the wiring will be hidden under the Corvette injector covers on the LS1 engine, and the wiring over to the computer goes around the engine compartment so it looks much cleaner under the hood.

The original harness from the 96 Impala was shipped to us and was used as a template for building the new harness to fit the car.

Some of the components of the original wiring, like the ABS and fuse block were kept and transplanted in to the new wiring. This system was built for an LS3 and 4L85E swap, and intended to retain all of the factory functions of the original vehicle.

You must be logged in to post a review. Custom Examples. Reviews There are no reviews yet. Select Your Options.That's it. It is easy, just time consuming. So I've listed some options next to what I usually do. Get creative and you'll find many more options.

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All of this below depends on what vehicle that you're putting the motor into. Other vehicles may need signals converted or you just use the senders from the original vehicle. You'll have to look that up and figure it out. I can't write up gauge swap info for every possible swap out there. This is a basic guide to get you started. This is the most important gauge to hook up. This is just one signal wire from the LS harness and then you add a power and a ground to the port. That easy. My latest approach is to get a three wire coolant sender and pigtail from a Camaro and replace the LS two wire sender and pigtail with it.

The extra third wire can be ran to the gauge. You could get creative and find ways to adapt the vehicles original coolant sender to the LS motor if you wanted. Some have milled down the sender and changed the threads to metric so that it'll fit the LS. Some have put the sender into the radiator hose. Some have drilled out the sender hole in the heads and threaded it to match the old standard threads.

This gauge usually works automatically and isn't effected by the swap or you can simply just attach it to power and it works. I've driven without a speedometer for many years. So this gauge doesn't really matter much to me. You just go with the flow of traffic. In my C10 trucks, I swap in a style Suburban gauge cluster it has an electronic speedo and run the wire to it. When you do this you'll have to re-pin the plug that goes into the back of the gauge cluster.

This is just one wire that you find on the LS harness and run it to the original one on the dash or add you own light where ever you'd like.

To find which wires on the LS harness are for what gauges, go to LT1swap. Before I get my gauges hooked up, I'm already driving the vehicle and working out swap bugs. I've often driven it for a year before starting to wire in the factory gauges.

Thats all that you need. I've driven for years with just that. You don't need the gauges working to do the swap. Jump to. Sections of this page. Accessibility help.This guide will assist you in making a seamless LS engine swap. Since every LS engine swap is a little different and there are lot of choices to be made, you can use this guide as a reference for ideas and part numbers as you move through the process.

Everything You Need To Know For Your LS Swap

You will find options and recommendations for motors and motor mounts, transmissions and flex plates, accessory drives, wiring and computer systems, oil pans, steam tubes, gauges, fuel systems, exhaust systems and carb conversions. We hope that this guide will make your LS swap as simple as possible. Disclaimer: This guide is intended for informational purposes only. You will need to verify everything for your own specific needs and the vehicle being worked on.

The information here is for general application. The specific LS engine you choose to start with will depend mostly on the budget you have to work with. Choosing an engine all comes down to what your particular goals are in making an LS swap and how much you want to spend. For most, a junk yard 5. They are cheap, readily available in any junk yard, and you can make decent power with just a cam swap.

The next step up in price is the all aluminum LS1 engine. This LS engine was first released in the Corvette, and is still a popular option because of the design which makes it small, durable and light.

The LS3 was first released in the Corvette and was the most powerful Corvette engine to date. The motor mount adapter plates are the foundation to a successful LS swap.

Adapter plates bolt onto the LS engine block, allowing you to bolt the engine securely to the crossmember. There are adjustable and stock location adapter plates available also known as 1-inch setback plates.

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Stock location refers to the point where the transmission meets the engine. When mounting the engine, keep in mind that the mating point for an LS engine has a different distance from the transmission than the mating point for a SBC engine. Most car applications require the LS engine to be moved forward due to firewall clearance issues with the passenger side cylinder head.Now fuel injection is all that comes from new vehicle factories and EFI engine swaps into older vehicles are very common.

It seems for many people that the scariest part of the modern engine swap is the wiring harness. These are mainly battery voltage, switched ignition voltage, PCM output to control fuel pump, and a brake switch signal for electronic torque converter control if used.

We have found LT1 Swap lt1swap. Brendan Patten runs the site and is an expert on programming many of the GM multiport injection systems. There are companies that outright sell new harnesses for LS engine swaps, and some vendors will also rework a used harness for a fee.

However, with a dozen or so hours of work and your attention to detail, you should be able to rework your donor harness yourself with some basic tools. This story is meant to give you an idea what tools and techniques are involved as we show you some work from our Chevy Tahoe harness for a 5. The process for other GM engine harnesses is similar. While it is possible to reuse a fuse block from the donor vehicle, they are often much larger and more complicated than necessary just to serve for this engine harness.

obs ls swap wiring

What are needed are typically four power fuses and two relays to complete the standalone harness. Understand that this harness is just for engine control and does not necessarily tie into the rest of your vehicle harness. Such outputs as the speed sensor can be used to drive an aftermarket electronic speedometer and an engine rpm signal that can run a tachometer. Plus, today there are tablet apps that can read the OBD-II port data and display some gauge information.

The earlier LS engine models were all drive-by-cable; that is, they used a traditional mechanical throttle cable.

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Next came drive-by-wire DBW versions that use an electronic gas pedal assembly and a servo motor mounted to the throttle body that operates the throttle plate. DBW systems on third-generation engines require you to use the gas pedal assembly and a separate throttle actuator control TAC module in addition to the PCM.

These components must be fairly closely matched by year to work properly. In most cases, it is most reliable to use components from the same year and type vehicle. In fact, pulling the engine and all related electronic components from a complete donor vehicle ensures that you have system-matching parts that will play well together. These engines can be reprogrammed to disable the sometimes problematic cylinder deactivation function, leaving all factory parts in the engine.

obs ls swap wiring

Patten has worked with these engines and warns that if a camshaft is changed, you must ensure that the lifters, camshaft, and AFM solenoid plate all match. The wrong combination of parts can damage to the engine. There was also a flex-fuel version L59 of the 5.

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This engine used different fuel injectors and pump to flow more fuel. In addition, the PCM uses program code to read a fuel composition sensor that provides a digital pulsed signal based on the amount of ethanol in the fuel supply.


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