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Date added: 12/04/2015 Howell EFI: Conversion Kits Help Kick The Carb!

Jeep EFI Upgrade Tips: Howell EFI Conversion Kits Help Kick The Carb!

No vehicle on the road (or off road) benefits more from swapping from a classic carburetor to electronic fuel injection than a Jeep After all, eliminating those angle sensitive float bowls that can starve an engine for fuel and creating an engine system that can adjust to the altitude of the climb by richening and leaning out the fuel delivery is every Jeep lover’s dream.

Howell EFI offers eight different kits for most Jeeps built between 1982 and 1993 that originally came with carburetors. Best of all, for the street-driven Jeeps, the conversion kits include full emission compliance within strict Air

Resources Board mandates. That means owners will never have a problem with the local regulators when checking emissions compliance.

“The Howell EFI conversion kit integrates the critical charcoal canister and the EGR systems and eliminates the need for the air pump and other engine cluttering components,” stated Troy Brown, Howell EFI Tech Director. “What we do recommend is that owners who install this kit go on our website and print out Air Resource Board Executive order D452 and keep this two page document in their Jeep. This document shows that our system is emissions complaint and should handle any issues they encounter.”

Pictured from top to bottom: Throttle body installed in place of carburetor, wiring through firewall, ECM installed in glove box, fuel pump and filter assembly. 

Installation Tips

The Howell EFI conversion kit includes everything you need to install the kit including the GM Throttle Body, reprogramed computer, high flow electric fuel pump, fuel filter, MAP sensor, all hardware, clips, mounts and most importantly, the custom factory-look wiring harness that uses better-than-factory components and wiring. Howell estimates that most of their Jeep conversion kits will take between 8 and 10 hours to install depending on your level of skill and the condition of your Jeep.

Key points to the installation include modification of the fuel system. Fuel injection systems require both a fuel delivery line and a return line, both running the length of the vehicle from the fuel tank to the engine. The recommendation is that this line be 5/16-inch diameter line, either braided steel or hard line. Rubber fuel line or steel line, if so desired, should be used but when using steel line, small sections of rubber hose are allowable around the new fuel filter and fuel pump to make them easy to service when needed. Many owners choose to mount these parts inside the transmission protection pan to avoid the buzzing noise notoriously emitted by electric pumps. Mounting the pump with some kind of rubber foam spacer where it touches the pan will keep the noise to a minimum.

The MAP (Mass Air Pressure) sensor supplied with the kit is a key component to proper operation. Howell EFI offers two types; one that can be simply installed off the TBI unit with a stiff piece of rubber hose or a second type that must be mounted in a downward facing angle with vacuum pointing towards the ground and the sensor mounted above the TBI unit itself on a bracket or the firewall. When reviewing your instructions, the MAP mount for your component will be noted.

Your Jeep’s computer is located within the interior behind the glove box. The dashboard on the passenger side must be loosened to allow for removal of the glove box. Once it is removed, the computer is easily located. Two nuts located on the engine side of the firewall must be removed to release the computer. Once it is free, gently remove the original equipment wiring harness junction from the computer.

The CTO (Coolant Temperature Override) switch is mounted on the engine block just below the intake manifold. It will be retained for any conversion and must be working properly. These switches are notorious for leakage, so if yours is showing its age it must be replaced. In addition, the original engine block mounted mechanical fuel pump will be removed and replaced by the block off plate supplied with the Howell EFI kit. The original pump rod stays in the block or the engine or oil pressure will not be correct. Make sure that the Howell plate is well sealed or oil leaks will occur.

For those looking for an overview of the system and owner experiences, YouTube-based instructional videos are readily available. “We have Jeep owners who go the full route and take out all of the original wiring loom and those that just tuck the unused original wiring away in the dashboard after heat shrinking the powered wires so they don’t ground out,” said Troy. “It is at the discretion of the builder as to how much or little they want to do – as with any vehicle modification. We honestly estimate the total install to not be longer than 10 hours from start to finish. The key is to study the schematic supplied with the kit and call our tech line if there are any questions.”

Click here to view our full lineup of Jeep EFI conversion products.

To learn more or to order your conversion kit or harness, contact Howell EFI at www.howellefi.com or call (810) 765-5100.

Date added: 12/04/2015 Howell EFI Conversions: One Size Does Not Fit All

Not all vehicle builds are the same. That’s why they call them customizers, right?

The fact is that when converting an originally carbureted engine over to fuel injection, there are many upgrades that are required to make it work properly. Electric radiator with thermostatic controls, fuel pump relocation to the gas tank, and exhaust oxygen sensors required to make the fuel injection operational all require a custom wiring harness to connect it all together. No “cookie cutter” conversions kits could possibly do the job.

“We see a lot of online conversions kits that claim to be a one size fit all solution for folks converting their cars to electronic fuel injection,” said Matt Howell, President of Howell EFI. “But the fact is that these are very complex systems that need special attention to the layout of the wiring harness and the right matching components. We spend a considerable amount of time on the phone during the order process to make certain every piece of the kit is better than OE spec.”

Howell wiring looms utilize better than original equipment wire. The individual connectors used are exactly the same as those used by the original manufacture to ensure perfect attachment to the assigned component – each one labeled with white tags to make for trouble free installation. Best of all, when ordering a Howell EFI conversion kit, everything is included. Case in point for the classic Jeep carb to EFI change out, the kit features components like a new throttle body and computer module, specifically programmed by Howell, to the requests off the consumer. It is literally turn key!

“We have people who call in thinking this is a simple process because they have done some research online or actually bought a cut rate conversion kit thinking that they had everything they need for the job,” said Troy Brown, Howell EFI Tech Director. “But it become painfully obvious that without attention to these details, the system will either not run at all, or it will start but not deliver the performance they expect. We get too many customers who spend good money only to find out that the discount system was a total waste of time. We spend a lot of time to get it right, and an equal amount of time researching new and updated systems to either enhance our existing systems, or expand our coverage to include new models.

To learn more or to order your conversion kit or harness, contact Howell EFI at www.howellefi.com or call (810) 765-5100.

Date added: 03/10/2015 ​Howell EFI Announces Arrival of New Fuel Injection Conversion Kit for classic Jeep Wagoneer and Grand Wagoneer

Marine City, MI – March 10, 2015 -The 1971-’93 Jeep Wagoneer and Grand Wagoneer have a huge following among off road enthusiasts. Howell EFI has recently released a carburetion to throttle body fuel injection swap kit which includes everything you need to swap over your 360 or 401 V8 to fuel injection eliminating all of the carburetor issues that plague these classic offroad vehicles. Upon installation, traditional fuel starvation issues will be eliminated and you will enjoy better cold starting, improved MPG, better drive-ability and the ability to attack any angle on the trail without the fear of fuel loss.

The kit is made up of almost all GM TBI OEM parts and includes the following:

  • GM Throttle Body
  • Adapter plate (intake) for 2BBL or 4BBL
  • Wiring harness designed to put the ECM under seat or in center console as the Wagoneer is very crowded under the dash
  • MAP Sensor, coolant sensor, oxygen sensor
  • External fuel pump, fuel filter, fuel pump block-off plate
  • GM ECM (computer) and calibration prom made specific for the 360/401 Wagoneer engines
  • Full installation instructions and trouble shooting guide

The result is a plug and play system that will completely replace the factory carburetion system and includes the GM computer “tuned” specifically for this application. As with all Howell EFI systems, the wiring harness is wrapped in weather tight encasement to avoid any weather or heat damage, far exceeding any original OE harness offered today. Their most popular kit is the California legal, CARB version that is emissions legal in all 50 states. Howell also offers full line of “off road” level harnesses for those applications that do not require emissions related components. Best of all, each harness kit is backed by a money back guarantee so you know it’s a quality parts that will deliver years of service. The kits also all utilize the OBDI GM diagnostic capabilities so a customer can scan or perform non-scan code access for trouble shooting

Part Numbers and cost of the kits:

Off Road Versions

#K247JW360 $1400.00

#K247JW401 $1400.00

California smog legal version CARB E.O. #D-452-2

#K247JPV8W360 $1500.00

#K247JPV8W401 $1500.00

At Howell EFI, we choose to sell only the best quality components, and all are covered by a money back guarantee. For additional information, visit www.howellefi.com or call 810-765-5100. Howell Engine Developments is located at 6201 Industrial Way, Marine City, MI, 48039.

Date added: 03/09/2015 Howell EFI Announces New 1955-74 Toyota Landcruiser Electronic Fuel Injection Conversion for F3.9L Engines

Marine City, MI – March 10, 2015 - For fans of the classic ’55-’74 Toyota Landcruiser, replacing the troublesome carburetion system with state of the art electronic fuel injection required a custom build that could end with questionable results. Enter Howell EFI who has come to the rescue with a turnkey (literally) throttle body fuel injection conversion kit that upgrades the engine system of the 3.9L engine replacing the troublesome carburetion system with electronic fuel injection. This is a highly desirable upgrade for fans of off road operation who know well the advantages of fuel injection over carburetion. Specifically, fuel injection delivers better cold starting, improved MPG, drive-ability the ability to attack any angle without the fear of fuel loss due to fuel starvation (a common issue with carbureted engines.).

The “on-road” kit (part number is #K247T) the kit is made up of almost all GM TBI parts and includes the following:

  • GM Throttle body
  • Toyota intake manifold adapter plate
  • Wiring Harness
  • MAF Sensor, coolant sensor, oxygen sensor
  • External fuel pump & fuel filter, fuel pump block off plate
  • GM ECM (computer) and calibration prom set-up specific to the F or 2F
  • Full installation instructions and trouble shooting guide
  • The result is a Plug and play system that will completely replace the factory carburetion system and includes a GM computer “tuned” specifically for this application. As with all Howell EFI systems, the wiring harness is wrapped in weather tight encasement to avoid any weather or heat damage, far exceeding any original OE harness offered today. Howell also offers full line of “off road” level harnesses for those applications that do not require emissions related components. Best of all, each harness kit is backed by a money back guarantee so you know it’s a quality parts that will deliver years of service. The kits also all utilize the OBDI GM diagnostic capabilities so a customer can scan or perform non-scan code access for trouble shooting.

    At Howell EFI, we choose to sell only the best quality components, and all are covered by a money back guarantee. For additional information, visit www.howellefi.com or call 810-765-5100. Howell Engine Developments is located at 6201 Industrial Way, Marine City, MI, 48039.

    Date added: 02/25/2014 Howe Racing Chooses Howell EFI Wiring Harnesses for Swedish V8 Thunder Series Camaros

    Marine City, MI (February 25, 2014)…Howe Racing came into existence in 1971 when Ed Howe started selling the cars he personally was winning races with. He left his job to continue racing and producing parts full time. He continually developed new components associated with them and then incorporated in 1974. Eventually the business took over his racing. Son Chas started working for him after school when he was only 10 years old. Later in 1987, he took over as General manager and became an equal partner in the business. Ed retired about 10 years ago in the early 2000’s. Chas eventually became a racer himself for many years, but now only drives an occasional test session.

    He has been involved with NASCAR, USAC, ARCA, ASA, CRA and ARTGO as oval track was the core of the business for many years in the USA. After 2000, the company started building oval track cars for a series in the UK called ASCAR and one in South Africa called SASCAR. Starting in 2008, they began to do more developing into the road racing market as some of the short track oval business was waning. Howe has built cars since Holland’s DNRT then Scandinavia’s Camaro Cup (now called V8 Thundercar ) and for DTC in Denmark. Most recently, they have had good growth with Trans Am in the USA with the creation of the TA2 class.

    “The early development of the Swedish Stock Car Series was exciting as we were creating an entirely new concept”, stated Chas Howe. “It was originally the idea of two Swedes; Hans Emeren and Tony Bryntesson. They came to me with the idea of adapting our chassis to their existing gen 4 Camaro drivetrain, and creating a gen five body to fit it. Considering that the gen 5 wasn’t released yet in 2009 it presented a real challenge. Thanks to assistance from GM’s Jeff Kettman, we were able to make it all come together. We tested the first prototype at the Autobahn Club Course in Jolliet, IL on August 13, 2009 with driver Nick Jonsson. By March of 2010 we had built and shipped 24 for their 2010 season. They have had three successful seasons and there will be 66 of these cars in Europe in 2014. The transition to the LS3 engine started development in 2012 and was implemented in the 2013 season.”

    Howe Racing goes way back with Bill Howell to a time prior to the creation of Howell Engine Development when co founder Bill worked at GM as a Chevrolet engineer. “Many times, Bill would assist us with GM products or with advice”, continued Howe. “Our first involvement with Howell Engine Developments was as part of the development of the LS1 engine for use in stock car racing in the American Speed Association. While we were tasked by ASA to install and test the engine, Howell was doing the same with the wire harness. Years later when we started working with GM on bringing the LS3 engine to The V8 Thunder Series, Howell was the obvious choice to create the wire harness.

    We know that anything we get from Howell will not only meet our specs but they also know the application so they will sometimes point out concerns that we may have missed. That is the real benefit of working with a company like Howell that has a great deal of practical experience. They are not just blindly pumping out product, they know how it is going to be used.”

    For more information on Howe Racing, visit www.howeracing.com

    Howell Engine Developments was formed in 1988 by Bill and Matt Howell to support the growing trends toward the use of electronic fuel injection in the Hot Rod/Street Rod and Four Wheel Drive segments of the automotive aftermarket. All Howell systems are full function, utilizing the GM computer (ECM), and Oxygen sensor, as well as complete GM diagnostic capabilities. For additional information, visit www.howellefi.com or call 810.765.5100.

    Date added: 05/02/2013 Howell Engine Developments Celebrates 25th Anniversary

    Marine City, MI (May 2, 2013) – In a short 25 years, Howell Engine Developments has progressed from a budding father-and-son business ran out of Bill Howell’s basement to one of the industry’s leaders in modern fuel injected conversion systems for vintage hot rods/street rods and off-road/four wheel drive vehicles.

    Built using Bill’s 26-year experience as a development engineer for General Motors, and son Matt’s tireless work ethic and commitment to customer satisfaction, Howell Engine Developments has worked diligently to bring customers the best and most reliable products to swap their old carbureted fuel system to state-of-the-art fuel injection using the same GM electronic components that Bill helped develop, including the GM engine control modules (ECM) and oxygen sensors.

    This makes all Howell EFI systems full function plug-and-play kits, and completely compatible with GM diagnostic tools. Moreover, Howell’s custom wiring harness packages use GM Packard high temperature (TXL insulation) automotive wire, genuine Packard connectors and terminals, and include Packard crimping tools.

    Banking off of countless hours of extensive development on both big-block and small block engines, all of Howell Engine Development’s systems are a great option for any hot rod, production carbureted vehicles, and off-road four wheel drive vehicles seeking to dramatically improve both performance and fuel economy.

    At Howell Engine Developments, we choose to sell only the best quality components, and all are covered by a money back guarantee. For additional information, visit www.howellefi.com or call 810-765-5100. Howell Engine Developments is located at 6201 Industrial Way, Marine City, MI, 48039.

    Date added: 02/27/2013 Howell Engine Developments’ LS3/LS7 Harness For 2006-08 58X Engines

    Marine City, MI (February 27, 2013) – Since GM’s introduction of the LS series of small block engines in 1998, the LS motors have quickly become the engine of choice for late model engine swaps, from street rods, vintage muscle cars, race cars and even off-road racers. Lightweight, durable and seemingly bulletproof, the LS motor – in all of its variations – is a plentiful source of cheap and reliable power.

    Since 2007, all LS engines have used a different ECM with a 58X timing wheel on the crankshaft, and an electronic drive-by-wire throttle body. To make installation of one of these late model motors several steps easier, Howell Engine Developments has engineered an engine wiring harness for all 2006-2008 LS3/LS7 58X-equipped engines. These harnesses feature all the correct connectors to make hooking up the electronic engine and transmission controls as easy as plugging in the required connectors. Every connector is clearly labeled so there is no need to go searching for the right plug.

    Howell’s LS3/LS7 wiring harnesses provide engine diagnostic capabilities right down to standard GM code output, an industry standard diagnostic port and check engine light making it compatible with all Chevrolet dealer and aftermarket diagnostic tools, and are made with GM/Packard high temperature wire, original equipment Packard Weatherpack connectors, and high temperature coverings to ensure the highest standard of reliability and a clean look under the hood.

    The engine ECM does not control the automatic transmission.

    At Howell Engine Developments, we choose to sell only the best quality components, and all are covered by a money back guarantee. For additional information, visit www.howellefi.com or call 810-765-5100. Howell Engine Developments is located at 6201 Industrial Way, Marine City, MI, 48039.

    Date added: 11/27/2012 The American Dream: How Howell Got Started

    Marine City, MI (November 27, 2012) – Retirement wasn’t in the cards for Bill Howell. A 26-year development engineer for General Motors, Bill watched as many performance enthusiasts converted their carbureted V8s to electronic fuel injection. Having dedicated so much of his professional career to developing and mastering EFI for GM, Bill paired with son Matt – who had been working as a professional landscaper – and formed Howell Engine Development.

    Started in Bill’s basement in 1988, Howell Engine Development was targeted at creating electronic fuel injection conversions for the hot rod/street rod and four wheel drive industries with the goal of reducing the difficulty in adapting late model GM engines or fuel injection systems in older pre-computer vehicles of all types. Using the same GM electronic components that Bill helped develop, including the GM engine control module (ECM) and oxygen sensor, and complete GM diagnostic capabilities, all Howell EFI systems are full function plug-and-play kits.

    Howell’s custom self-contained wiring harness packages employ GM Packard high temperature (TXL insulation) automotive wire, genuine Packard connectors and terminals, and include Packard crimping tools. According to Howell, “As an adjunct to our wiring harnesses, we developed complete throttle body and multi-port fuel injection systems. We combine proven GM electronic components, Howell wiring harnesses, two and four-barrel TBI and TPI units. With extensive development on both big-block and small block engines, these systems are attractive updates for both hot rods, production carbureted vehicles, and off-road four wheel drive vehicles seeking performance and fuel economy.”

    This set Howell Engine Development apart from then-competitors. So much so, that later that year, Rick Voegelin (who had worked with Bill on editorial stories while he was at GM) from Hot Rod Magazine ran a feature story in the April issue – causing an overnight explosion in demand. Howell was still being ran from Bill’s home, and the influx of sales calls came in through the home phone number – which was the only number he had to run in the advertisement. According to Matt, “Mom went absolutely nuts with the calls.”

    Within a short time, Matt bought a three story house, rented the upstairs, lived on the middle floor and converted the basement to the business office and warehouse. In 1993, Bill and Matt built the building they are in today with profits from the business and without having to take out any loans.

    At Howell Engine Developments, we choose to sell only the best quality components, and all are covered by a money back guarantee. For additional information, visit www.howellefi.com or call 810-765-5100. Howell Engine Developments is located at 6201 Industrial Way, Marine City, MI, 48039.

    Date added: 07/11/2011 Howell EFI: Understanding the Benefits of Electronic Fuel Injection

    For Immediate Release, July 11, 2011…..Bill Howell of Howell Engine Developments, an industry leader in EFI solutions for the aftermarket explains the benefits of EFI over carbureted engines. Fuel injection’s main benefits can be broken down into three categories: Improved mileage, reduced emissions and improved performance. Carburetors, for a lack of a better word, are dumb and they operate like a hose faucet. They are either on or off, with very little control. Here’s how the system works: A fuel pump will suck the fuel out of a tank, send it to a pressure regulator, and dump the fuel into the carb. When you step on the throttle, plates open up, air rushes in and fuel is dumped in. This fuel & air then pass thru the bottom of the carburetor, where it mixes together in the intake manifold. (most of it does). The mixture is then dropped into the cylinders when the intake valves open. The spark burns what is needed, and the remainder of the mixture, as well as the left over gasses exit the engine when the exhaust valve opens up. It is the picture of inefficiency. If this process were an employee at your business, he would have been fired long ago.

    Fuel injection on the other hand, is intelligent. It actually has a brain, commonly called a control unit. This control unit works with several sensors on your vehicle to monitor conditions. The Mass Air Flow sensor measures the quantity & quality of air rushing into your engine, your crank position sensor monitors the rotation of the internal components, your throttle position sensor monitors what your right foot is doing, and the oxygen sensors measure how well your engine is burning the fuel. All this information is then fed to the control unit, which carefully dispenses the precise amount of fuel to each cylinder. The fuel is not poured into the cylinder, but rather atomized thru an injector. This atomization then allows the fuel to be more completely burned. If the exact amount of fuel is reaching each cylinder, then there will be little waste.

    On a car equipped with a carburetor, all that unburned fuel has to go somewhere: usually thru the exhaust, or by contaminating the oil. By monitoring atmospheric conditions, and cylinder temperatures, the fuel mixture is delivered to each cylinder individually (more in some, less in others). This is how Fuel Injection uses less fuel than a carburetor. When the fuel mixture has been ignited in the cylinder, there will be less gaseous emission waste. This is how fuel injection lowers emissions. It’s all about efficiency.

    By burning a higher percentage of the fuel mixture, you are also achieving better performance by getting the most power possible out of each droplet of fuel. Increased performance is also quite noticeable on acceleration, and throttle response. When you turn your ignition key to the “on” position, fuel injection goes to work, even before you crank the engine. Your injectors are woken up, filled with fuel, and ready to go. It knows it’s cold in that engine, so the mix is adjusted accordingly, that’s why your car doesn’t spit, sputter or cough when you first start it. When taking off from a stop, the exact amount of fuel is delivered at the exact moment it’s needed, therefore improving throttle response.

    As an added bonus to fuel injection, it takes up less room in the engine compartment. A carburetor must be equidistant to all cylinders, and is gravity fed. Therefore it must be located on the top center of your engine. If space is a concern, fuel injection is the way to go. Fuel injection = The smart choice.

    At Howell Engine Developments, we choose to sell only the best quality components, and all are covered by a money back guarantee. Whether replacing your carburetor with EFI, or your whole power plant with a current EFI engine, Howell can meet your needs. For additional information, visit www.howellefi.com, or call 810-765-5100. Howell Engine Developments is located at 6201 Industrial Way, Marine City, MI, 48039.

    Date added: 04/19/2011 Howell Engine Developments Announces the Release of its NEW Website Located at howellefi.com

    For Immediate Release, April 19, 2011….. In keeping modern technologies, Howell Engine Developments, longstanding experts in EFI conversions, has recently unveiled its newly redeveloped website located at www.howellefi.com. The all new website has been designed to be a comprehensive resource for current and potential Howell EFI customers.

    “Our product can be a little intimidating to customers who don’t deal with it on a daily basis like we do,” said Howell EFI owner, Matt Howell. ”Our goal with the new website was to create an online space where customers can go and learn more about all of the offerings that have available for their specific need, as well as learn more about EFI technology in general. EFI conversion has a true benefit to those that can use it and the more we can educate the consumers about those benefits, the better our business, and love for cars & trucks hobby, will be in the long run.”

    The new website features a complete history of the company, extremely organized category searching options, a full support section, testimonials about successes with the product, and the opportunity to sign up for the EFIeNewsletter.

    “When we were tasked with creating this new space, we felt it was really important to put ourselves in the shoes of a potential Howell EFI customer,” said Gregory Parker, Director of Online Development for Martin & Company Advertising. “We developed and organized the site in such a fashion that we feel anyone should be able to find exactly what they are looking for with extreme ease. And the streamlined ecommerce platform allows for a flawless checkout once products are selected. We are happy with what we were able to provide to Howell and think it will a solution they can work with for the next decade.”

    For additional information about Howell Engine Developments, visit www.howellefi.com, or call 810-765-5100. Howell Engine Developments is located at 6201 Industrial Way, Marine City, MI 48039.

    For additional information about Martin & Company Advertising, visit www.martincoadvertising.com, or cal 615-876-1822. Martin & Company Advertising is located at 3504 Knight Road, Whites Creek, TN 37189.