Please practice handwashing and social distancing, and. It uses an ignition module within the distributor to regulate the timing curve as well. May 15, 2017 chevy ignition coil distributor wiring diagram in addition diagram msd. General motors 7pin hei ignition control microsquirt. Hei on left, pointsstyle or chrysler electronic on right. Msd tech symptoms troubleshooting tehniques for msd holley. I had one with a stock module on a big block chevy, with 121 compression and about 625hp. Duihei streetstrip coil kits performance distributors. This metal strap makes contact with the coil frame when the coil is bolted into placeand grounds out thru the male blade down thru the wiring to the inside of. Hardened steel gear machined to exact tolerances for a tighter mesh with cam gear. Many parts stores can test the hei ignition module at no charge. The tools you need to diagnose an hei that has a 4terminal module.
Further testing is required to pinpoint the problem. If there is power, disconnect the electrical connector and remove the cap. Remove the distributor cap, leaving the spark plug wires attached. Pickup coils for the hei distributors are not available as replacement parts. They max out at 5 amps current flow through the primary coil windings when the coil reaches full saturation. The dwell control circuit ensures, long consistent coil charging. You should have battery voltage w the key in the start and run positions. Ignition technical support holley performance products. A hei large cap with integral coil b hei small capremote coil v6 and v8 engines c hei small capremote coil 4 cylinder engines. Acdelco d1906 professional ignition control module very nice part and quality made you will not be unhappy with this purchase, works great as the manufacturer intended.
The distributor needs only one wire to supply the module with power. Shop for msd street fire hei module for gm hei distributors pn 8362 with confidence at. Corvette ignition control module test no spark troubleshooting duration. The hei ground is through the distributor body to the engine, then to the battery negative cable. Discover how to test your entire ignition system with one simple. I tested the 6al and found it worked perfectly to keep the engine rpm within. It will automatically advance the timing on acceleration a specific amount and retard the spark when decelerating and starting.
Some engine use a hall effect switch, which used used in place of the reference terminal on the hei module. The test lamp should blink repeatedly as the engine cranks. Is it time to give that tired hei distributor a little makeover. Carefully detach the wires from the module terminals.
The gm hei distributor uses a hall effect for the triggering and sensing the no. Pertronix flamethrower hei ignition module wiring harnesses feature a premiumquality wire and capacitor to ensure good connections and staticfree operation. It is imperative that silicone lubricant be used under the module when it is installed, to prevent module failure due to overheating. Acdelco d1943a gm original equipment ignition control module. A good battery tester is designed to gauge the charge of the battery and the strength of the ignition. The high voltage coil allows spark plug gaps to be opened up to. I show how to test your entire ignition system including the spark plugs, spark plug wires, ignition control module, and ignition coil.
Ignition and use the car as a daily driver, the wires will. Troubleshooting the gm hei distributor it still runs. General motors 7pin hei ignition control megamanual. If the pick up coil and the ignition coil checks good, the next thing to move on to is the ignition module. The solid state electronics provide high coil out put and superior reliability. The hei is ok, but perhaps your distributor cap or some of your plug wires are defective. Control modules put some spark in that ignition with one of many distributors from high performance ignition builders like.
You will want to determine whether the ignition module is producing electricity and that the electricity is getting to the spark plugs to get your engine going. High performance ignition module for gm remote mount coil hei. I dont the omega anymore but still have 3 original gm 8pin modules and a hei coil. Automotive vehicles require a battery to run the ignition and keep it operating for years. Remove the air cleaner to provide room to work around the distributor. For even more performance upgrade to the heat digital hei module, with built in rev limiter pn 83647.
Msd street fire hei module for gm hei distributors pn 8362. If it is one of our modules, you can send it into our repair department and we can take a look at it. I have been using mine for some time now and its still working like new. If, for some reason you have no spark coming from your distributor, the following will help you check and test the installation, connections, and components, of. Stock hei modules have current limiting circuitry built in to them. A highquality tester can streamline your testing needs and provide you with the information you need to keep your vehicle. An hei distributor is still an inductivedischarge ignition, but it exchanges the points for a solidstate electronic switching device called a module.
In addition to the module shown above, you can use the hei 8pin module from the small cap hei distributor. Thanks for your help i suspect that the coil is bad. This module is a direct plug in for the 4pin hei module. Direct plugin replacement for easy plug and play installation. So i thought the elctronic pickup coil in the dizzy was bad. This module fits most gm remote mount coil hei distributors for v8 engines. They include preterminated ends that can be installed in minutes with no cutting or modification. Stephanie demonstrates that a fast screw driver can help quickly give your. Because of the complexity of the internal circuitry of the heiest module, it is recommended the module be tested with an accurate module tester. Gm 4 pin dynamodule dui hei performance distributors. Hei troubleshooting page 2 coil in cap chevythunder. Hot rodding the hei distributor crankshaft coalition wiki.
Chevy ignition coil distributor wiring diagram in addition. All of the tests are on car tests, do not remove the ignition control module icm from the distributor all of the figures show the ignition control module off of the distributor but this is just for illustration purposes only. Connect the ground side of your test lamp to the battery positive cable. The duraspark ignition box also has a bad reputation. The control unit for the magnetic pickup is a module located in the distributor. Save on ignition modules with great deals at advance auto parts.
New listing 8362 59107c red racing fire hei distributor fits for chevy 350 454 sbc bbc gm08. Failure to use the paste, which is a thermal transfer that allows heat to be conducted away from the module to the larger surface area of the distributor to dissipate heat, will mean almost instant destruction of the ignition module. After a bunch of troubleshooting, i replaced the hei module in the distributor. Im just wanting to learn if there is a test, with my multimeter, to see if the coil is indeed bad. Gm 8 pin hei conversion pics for a bodies only mopar forum. Ignition modules hei distributor type free shipping on. Too much resistance in the spark plug wires or a bad hei bushing can cause the coil to fail. Installation is easy as the dynamodule mounts in the stock location of an hei module with no modifications. With a gm hei 7pin and 8pin modules, the ignition module wires you need to know about are. A nospark condition is checked by checking the distributor for power at the connector on the side of the cap. But, it had the 6425 6 ignition control module, and i wanted to be able to limit. Remove the coil wire from the distributor cap and position the terminal so it is approximately. Distributor dyno test swapping hei for dui ignition. Youve even replaced a distributor cap and rotor and timed an engine.
Our 50,000 volt dui davis unified ignition streetstrip coil kit is designed for a maximum output of 7000 rpms. Fits all v8, 6 cylinder and 4 cylinder dui hei distributors. The module sends out a voltage to the magnetic pickup. This was used on 1987 through 1992 camarofirebird tuned port injection v8 engines, as well as 1987 to 1993 full size cars and 1987 to 1995 pickup trucks, and v6 mpfi cars such as the fiero. The entire hei system except for the ignition coil on fuel injected engines is contained within the distributor cap. W signal wire from distributor g signal wire from distributor i have seen several threads on this forum of people using this set up on fj40 using the 1978 fully electronic dizzy same as whats in my rig. The engine for our test is the perfect candidate because it should be capable of big power and able to stress any ignition. This hei distributor for sb and bb chevy noncomputer controlled engines features. The ignition module is responsible for creating the spark that starts your engine, so when your car wont start, testing this part is a good place to begin. When i had my hei out i drilled a small hole in the aluminum base an used a 14 x 12 hex head an ran a ground wire to the firewall. Twilight garage ignition control module 4 pin hei distributor d1906 lx301 for 19741987 gm chevy buick cadillac oldsmobile pontiac. The coil is an integral part of the distributor and is located in the distributor cap.
The module is essentially an amplifier with a built in analog to digital convertor. How do i test the coil on the top of the distributor. High strength dielectric red distributor cap and rotor with brass terminals resists cross fire and high rpm arcing. The following test will determine if your msd is producing a spark. This high performance hei module provides your plugs with more spark over the stock module. Hei distributor troubleshooting with performance distributors. For all but a slant, you can buy a readytorun hei distributor module, pickup, and the coil of an hei distributor is a little trickier than an oldschool points distributor, we checked in with the folks at performance distributor to get some diagnostic input. Accel, mallory, msd ignition, pertronix, proform and more. How do you convert hei to mopar for a bodies only mopar. Ive drag raced for years, and used heis quite a bit of that time. Also fits performance distributors chevrolet, pontiac and dodge tripower ignition systems. The 8pin hei module is a bit better than the 4pin, using sealed connectors, and found on 8595 chevy v8 93 cars.
Turned it over 7k a few times not on purpose and it never missed a beat with that old hei. Hei is also easier to retrofit to pointstype engines. Remove the distributor cap and wires as an assembly and position them out of the way. Best rated in automotive replacement ignition control units. The ignition module is extremely accurate in its delivery of energy resulting in more accurate ignition timing. Disconnect the vehicle wiring harness, and distributor wiring harness from the distributor cap. Thats all a bunch of crap that the antihei folks on other forums have been purporting. Youll waste a lot of time if you crank the engine with the ignition off. The current control circuit protects against coil over heating. How to test the gm ignition control module 19952005. There were a number of different kinds of general motors hei modules.
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