Gm hei module These modules provide enhanced high RPM performance and when used with their corresponding Flame-Thrower coil, substantially increase spark plug voltage. In the world of aftermarket distributors, Davis Sep 14, 2004 · HEI ELECTRONIC DISTRIBUTORS Flame-Thrower Street/Strip distributors have a specially designed HEI distributor module and coil combination which operates without misfire beyond 7500 RPM. The Dwell control circuit ensures, long consistent coil charging. But instead of using a replacement Ford Duraspark module—which exhibit questionable durability characteristics—we will instead substitute the durable and reliable GM HEI module. Jun 3, 2020 · Since its introduction in 1974, the High Energy Ignition (HEI) electronic ignition system has been a major part of cars designed by GM through the 1980s. It failed with about only 5 miles. More dwell within the module extends coil saturation time and this allows the coil to produce a more intense and longer duration spark, improving throttle response and low-end power. Sep 23, 2018 · We traveled to Classic Restoration Enterprises in Pine Island, New York, where technician Richard Wiegand worked with us using a brand-new ACCEL HEI unit to illustrate the inner workings of the HEI and how to service it. Get step-by-step instructions and tips from experts. Swapped in a "GM" module and engine fired right up. Now my understanding is in order to take advantage of the variable dwell built into the hei module Nov 1, 2006 · Read about how to install GM's Advanced High Energy Ignition electronic distributor in 4Wheel & Off-Road Magazine. The resistance of the ignition coil primary circuit go down, current (amperage) demand increases, and the power transistor in the module can't deliver enough current. It is typically based on an integrated circuit which regulates coil current using an internal variable voltage reference, which responds much faster to changes in duty cycle. It could mount to the inner fender or firewall, however, the included solution is better for a few reasons. Feb 14, 2010 · I'm using GMCBubba's Mopar/GM Hei ignition for my 52 chrysler hemi and I had a difficult time finding a good working GM HEI module. Switched out the module with one from a well used HEI dist and never had another problem. Learn how to correctly wire a 4 pin HEI module in your GM vehicle to ensure proper ignition and improved performance. Fits all V8, 6 Cylinder and 4 Cylinder DUI/HEI Distributors. By 1978, it had a five-pin unit. The current control circuit protects against coil over heating. The internal coil and ignition module work on a 12-volt system rather than reduced voltage via a ballast resistor. 3 V6 and factory 5 speed. These modules provide enhanced high RPM performance and when used with their corresponding Flame-Thrower coil, increase spark plug voltage by more than 40%. 4 and I want to run a canister coil to have the right look but most canister coils run 1. . Amazon. Housings are CNC-machined 6061-T6 aluminum with an upper support bearing to provide accurate timing at higher RPM. Aug 26, 2015 · Get the Best Performance with JEGS HEI Ignition Control Module 4-Pin for 1974-1990 GM Car and Trucks 40600 parts at JEGS. Might have been a factory defect. Learn about the wiring diagram for the GM HEI module, a crucial component in the ignition system of General Motors vehicles. Jan 27, 2025 · I had a new GM HEI module fail in a 23-T bucket I built a few years ago. Mar 5, 2019 · Originally, the HEI system was fitted with a four-pin module. Parts are just part of what we do. The HEI delivers a more powerful ignition spark, and this allows the use of wider spark plug gaps to help ignite fuel quicker, and deliver a more complete combustion. 7 range. If the wires are attached with a plastic connector, release the locking tang before pulling the connector off the terminals. 3 to . I parked it in front of my shop, shut it off and went to start it, no fire. Some later models used a 5-pin module (for a knock sensor) Computer controlled engines used a 7-pin module When replacing a points distributor, you should use a distributor with the 4-pin module. The GM HEI distributor and coil wiring diagram shows the wiring connections between the distributor, the coil, and the ignition module. Jun 11, 2024 · I've come across a number of articles describing the use of a GM HEI module with a Ford Duraspark distributor on line and thought it was going to be A detailed GM HEI wiring diagram guide for understanding ignition system connections, components, and troubleshooting methods for GM vehicles. Compact in design, the HEI system incorporated the ignition coil into the distributor cap. com: gm hei ignition module4 Pin GM HEI Ignition Module, Ignition Control Module Replace OE #LX301, DM1906, 1875990,1190357, 4419628 Pcm Engine Control Module Compatible with 1974-1988 for Chevy Pontiac Olds Buick PerTronix HEI Performance Ignition Modules are direct replacements for popular GM and Ford electronic distributors. The four-pin module was used on carbureted engines and uses conventional mechanical timing controls (vacuum and centrifugal advance mechanisms). Improve your engine performance with the right wiring setup. Sep 23, 2025 · Allstar GM HEI Module ALL81208 Distributors have high output coils and adjustable vacuum advances, perfect for upgrading stock HEI distributors for higher RPM. Find out how to properly wire the module to ensure optimal performance and functionality. I recently installed an MSD module with a rev limiter, as I thought the root cause may be the crappy replacement modules and I wanted the stealth rev limiter capability. HEI Conversions Finding an HEI Distributor There are a couple of choices here, new or used. The ignition coil fires when the module shuts off voltage to the coil primary. com. Jun 26, 2019 · The GM Vortec engines have the ignition coil and module next to each other on a heat sink, but I don't have a photo of how they're oriented. Can these be tested at any of the parts stores? Did a search here and did not find much on diagnosis/testing of the module. This high performance HEI module provides your plugs with more spark over the stock module. When mounting the GM 4-pin HEI module, always fasten it with dielectric, thermal or heat sink grease/paste on a clean, flat aluminum plate with plenty of fresh air circulation to dissipate the heat while in operation. Test for power at the pink BAT terminal. With the MSD HEI Distributor Upgrade Kit, you can improve the performance of your early model GM HEI distributor A rotor, cap, coil, module, and dust cover are included in the complete package The 7. There is no denying that HEI distributors are a popular swap into older, point-ignition equipped GM cars. Jul 17, 2004 · I'm using the MSD HEI Module on my SBC 400 which was turned to 6500 rpm without any problems. Connect the ground side of your test lamp to the battery POSITIVE Having a no spark issue on your GM engine? In this video, I show you exactly how to test a 4-pin HEI ignition module — both on the bench and while it’s still installed in the car. 5 Amp MSD Digital Performance Module is unified with the coil for the most precise timing and dwell control Extraordinary coil saturation means optimum power at high RPMs Coil drive currents are 50 Aug 30, 2007 · Is there a way to test the HEI module? I had my HEi quit yesterday and do not yet know if it is the module or the pickup coil. With a control module and magnetic pickup incorporated in the distributor, the unit was a self-contained, modular-type system. Feb 1, 2008 · An ACDelco Professional, premium aftermarket Ignition Control Module is a high quality replacement for many vehicles on the road today. It provides a clear diagram and color coding for easy identification and troubleshooting of the various wires and components. The engine was sputtering, etc and would just not run. Include snap-on spark plug wire retainer and instructions. The ignition coil is housed in the distributor cap, which makes the GM HEI distributor a very efficient, self-contained unit. In addition, here are a few things to note: '75 to '79 ('75 to '85 Canadian) used 4-pin modules. Jul 7, 2017 · This just happens to be very similar in design to the GM HEI distributor’s pickup. Shop Now at the Guaranteed Lowest Price! Mar 23, 2016 · The HEI distributor is a popular upgrade for an big- or small-block Chevy. Seven and eight-pin modules were more a computer-controlled element that came around in the 1980s. Mounting holes in the module body must be connected to engine/chassis ground (battery negative ( ) post). The module is essentially an amplifier with a built in analog to digital convertor. Get step-by-step instructions and diagrams to help you with the installation process. Installation is easy as the Dyna-Mod mounts in the stock location of an HEI module with no modifications. Jun 14, 2021 · I know that might sound strange, and although the HEI was initially a General Motors ignition, many fans of Mopar and Ford realized this as a great upgrade, and Performance Distributors stepped up to the plate to deliver non-GM HEI-style distributors. Shop Now at the Guaranteed Lowest Price! With your Distributor completely squared away, it's time to decide where you want to place the brains of the system, the GM HEI Module and Heat Sink. Shop for MSD GM Street Fire HEI Module with confidence at AutoZone. To 1. Today - my MSD module bit the dust. To test reluctor pickup with a Digital Multimeter, set to LOW Ohms, measure across the two leads that are connected to the GM HEI Module BUT disconnect them first. Apr 20, 2008 · (The example here is for a small-block V-8 engine, but with exceptions for mounting the module, because of distributor location, this will work exactly the same for a big-block or a slant-six engine) PARTS YOU WILL NEED: A quality mid-late 70’s GM HEI Module (Standard Ignition # LX-301 – AC Delco # D1906 – Borg Warner CBE4) The 7 Pin HEI Module With a GM HEI 7-pin (and 8-pin modules), the ignition module wires you need to know about are: tach signal is a purple wire with a white trace [pin R] goes to Ampseal OPTOIN+ pin # 30 (ground the Ampseal OPTOIN- pin # 31 at the distributor) advance control signal is a white wire [pin E] goes to Ampseal pin # 12 override (cranking) signal is a tan wire with a black trace Apr 23, 2018 · Buy Twilight Garage Ignition Control Module 4 Pin HEI Distributor D1906 LX301 Compatible with 1974-1987 GMC Buick Cadillac Oldsmobile Pontiac: Distributors - Amazon. It increases voltage in order for the spark plugs to ignite the air/fuel mixture as the starting and charging system starts the engine, maintains the battery's charge, and provides power to the electrical accessories while the engine is running. Feb 23, 2022 · The HEI distributor consists of a control module and a magnetic pickup inside the housing that replaces the previously used contact points and condenser. What coil are you using? What is the primary resistance? What is the voltage at the module "BAT" terminal? Jun 10, 2015 · I have searched every combination I could think of and havent found a definite schematic or written verbiage of how to use an HEI module with my points Carefully detach the wires from the module terminals. Choose from 5 different modules depending upon your OEM distributor type. That way if the MSD box fails, it would only require a few simple wiring connections to hook up the HEI module. During the dyno we started with the shop MSD 85551 and switch to my HEI w/ MSD Module, Accell Coil, Rotor, and Cap. Next, we'll verify that the ignition control module (ICM) is receiving the signal from the pick up coil. Oct 17, 2019 · From way too many HEI module failures with the epoxy coils in the caps gong bad, slowly causing both their, and module failures, I use the oil filled coils, and the module failure issues virtually stopping when the in cap epoxy coils are changed out. The Module will mount in a stock HEI housing (by removing the original condenser assembly) or in MSD’s Pro-Billet HEI Distributor, PN 8365. Whether you Need a wiring diagram for your GM HEI ignition system? Check out our guide for step-by-step instructions and diagrams. We rigged a simple bench test to show how this idea works with a Ford distributor. This module fits most GM HEI for V8 engines with the 4 pin module 1974 thru 1985 Jan 27, 2010 · The GM HEI distributor's springs can be replaced with three different weights of springs that, in effect, allow the advance at lower rpm. I see that hei when using external coils use a E coil with a primary of . It features a programmable rev limiter for overrev protection. There are four basic types of HEI control modules: four-, five-, seven-, and eight-pin. I have a 1986 GMC Safari with 4. 5 with a few in the . That's nearly 3000 RPM higher than most stock HEI Distributors. The pickup’s job is to signal to the module when to trigger the spark. Battery voltage at both the ignition coil and ignition control module. Jun 25, 2006 · We analyze 10 common myths regarding HEI (High Energy Ignitions) distributor system including ones regarding internal coils, billet housings, performance gains, vacuum advance, and plug wires May 24, 2019 · Buy JDMSPEED New Ignition Module GM HEI 4 Pin D1906HT LX301 Replacement For Buick Chevy Pontiac Old 1974-1988: Control Units - Amazon. Dec 29, 2015 · Our performance ignition modules are direct replacements for popular GM and Ford electronic distributors. The Dyna-Mod enhances coil output through increased electronic dwell. I went thru two new Apr 7, 2017 · In a GM HEI system, the module replaced the contacts of the breaker points and the pickup coil was substituted for the rubbing block and distributor cam. For that matter, the original HEI had the pickup, module, and ignition coil in close proximity to each other. Mar 5, 2025 · Those GM modules don't fail due to heat like the Ford TFI modules, unless you're using the cheapest China module you can find. The control module’s function is to provide the same ignition pulse as the breaker points previously found in a points and condenser system. A GM Coil can be used or for maximum performance, use MSD’s HEI Coil, PN 8225. The Rev Limiting Module from Performance Distributors is a direct fit into any HEI distributor. Jun 9, 2011 · GM Genuine Parts and ACDelco Wires and Cables GM Genuine Parts Original Equipment and premium ACDelco Gold (Professional) aftermarket wire and cable products include high-quality spark plug wire sets, coil on plug boots, battery cables, pigtail/trailer connectors, lamp sockets, sensors, relays, and wiring harnesses all recommended by GM. Oct 21, 2009 · Where Do We Start? We'll first check for the basics like: Spark. Jan 16, 2006 · HEI Electronic Ignition Retrofit How-To Page 1 of 1 Page 1 of 1 Home » Board index » Tech Q & A Jun 10, 2012 · The easiest way to test a module on the car is to ensure that the wiring & pickup coil are OK. Aug 3, 2017 · Then, even with a CD ignition in the car, you can also keep that small aluminum HEI module plate as a backup. Mar 15, 2012 · Replace module and problem solved. Sep 1, 2001 · Read the tech article on HEI Coils And Modules, brought to you by the experts at Chevy High Performance Magazine. [citation needed] The five-pin module was introduced in 1978 and was an early attempt at electronic timing control; it contains a provision for connecting a knock Jan 25, 2018 · They are the GM HEI Module, and the reluctor coil pickup. Learn how to wire your GM HEI distributor and coil with this step-by-step diagram. gm hei module | Speedway Motors, The Racing and Rodding SpecialistsAccel | #10535361 Accel 35361 GM HEI Ignition Module, 1974-95 Gain a crisper, smoother running engine by replacing the stock ignition module with our Dyna-Mod. The solid state electronics provide high coil out put and superior reliability. By Get the Best Performance with JEGS GM HEI High-Output Module with Rev-Limiter Control [4, 6 & 8-Cylinder] 40062 parts at JEGS. com FREE DELIVERY possible on eligible purchases Feb 29, 2020 · Module failures often result from partially-shorted ignition coil windings. This Module is a performance replacement for GM’s 4-Pin HEI Module. An ACDelco May 15, 2025 · What does HEI distributor mean? HEI stands for High Energy Ignition, an electronic ignition system that produces higher voltage output and extends spark plug life. Find out how to test for issues in an HEI distributor with the help of Performance Distributors. 2. Get yours online today and pick up in store. Learn how to wire a HEI ignition module in your vehicle for improved performance and reliability. You could What is HEI? HEI is a term used by GM that stands for High Energy Ignition. Then we'll check that the ignition control module is triggering the ignition coil. There are three main components in an HEI: the ignition module, the pick-up coil and the integral high-tension coil. An HEI ignition system uses a highly efficient control module that is capable of switching a large amount of energy to the spark plugs AND a high power coil with low primary resistance that can provide that power. Fit small and big block Chevy (except 348 and 409). com FREE DELIVERY possible on eligible purchases Nov 15, 2018 · Converting the mopar in my 31 to hei to get rid of external ignition box and simplify wiring. May 7, 2025 · A GM HEI module does not rely on slow thermal coefficients. You should have battery voltage w/ the key in the start and RUN positions. The way this unit is built has more venting than the original mounting in a HEI distributor. Dec 11, 2017 · Troubleshooting an HEI distributor doesn't have to be hard. Easy tests for HEI system: 1. vfvj zvywi hpdes fouct gqfob icoyed wbrbnryp xhcrou gthopi lygnoc glpul enpe rvvz xcbdp bwo