With an electronic module, an HEI can safely operate at much higher current loads. More power applied across the primary circuit of the coil means the coil can apply greater spark energy to the spark plugs. This additional power ensures more complete combustion at both idle and at wide open throttle.
How do I know if my HEI module is bad?
- Engine Fails to Start. If the positive hot wire from the battery that feeds the distributor has no voltage to it, the HEI distributor will not function. …
- Plug Wire Engine Miss. …
- Reduced Fuel Economy. …
- Weak Spark. …
- Electrical Arc and Shorts. …
- Hard Starting. …
- Smog Check Failure.
Can you drive with a bad ignition module?
A failing ignition control module can be a real headache at times. It can produce a wide range of engine performance problems, including preventing the engine from starting or stalling the engine as you speed down the road, just to let you resume your driving a few minutes later, as if nothing had happened.
What happens when a ignition module goes bad?
a faulty ignition module can affect ignition timing, resulting in an engine that misfires and runs rough. the engine may also run well at low speed, but won’t accelerate well. 3. stalling: a failing ignition module can occasionally prevent the engine from getting spark, causing it to stall.How do you test an ignition module?
Connect the ground lead from the 12-volt test light to the negative terminal on the ignition coil. Have your partner crank the engine over several times. Your test light should flicker on and off. If so, your module is working properly and no further testing is necessary.
How do HEI distributors work?
The HEI distributor is still an inductive-discharge ignition, but exchanges points for an electronic device called a module. Since this system produces more voltage and amperage output than a point-type ignition, it requires a larger-diameter cap to prevent voltage crossfire inside the distributor cap.
How do you bypass ignition Control Module?
Do you think the vehicle will still operate without the inputs from an essential control module? If you really want to “bypass the ignition control module,” just pull the fuse and sit there in your immobile car.
How do I check my HEI distributor?
Testing the GM HEI Distributor Check the coil tower for excessive wear. Remove the top plastic cap on the distributor cap. Use an ohmmeter and check the coil positive terminal to the metal case of the coil. The reading should be infinity.What does the capacitor do in an HEI distributor?
The capacitor in the base of an HEI distributor is there to suppress radio interference.
What causes an ignition control module to fail?The number one reason that ignition modules go bad is because of heat. On most of the cars that have a recurring problem with this, they have the original distributor in the car. As the distributor ages and wears, the bushing in the shaft goes goes bad and starts to cause excessive heat.
Article first time published onHow much does it cost to replace ignition module?
How Much Does an Ignition Control Module Replacement Cost? A replacement ignition control module can cost anywhere between $50 and $250. Labor costs can range anywhere between $70 and $90.
How do you diagnose ignition problems?
- Verify Lack of Spark. …
- Check for Any Obvious Issues. …
- Probe for Power. …
- Double-Check Firing Order. …
- Double-Check Initial Timing. …
- Test/Inspect Spark Plugs. …
- Test Spark Plug Wires. …
- Check for Spark at Coil.
Why is my distributor not getting spark?
A Bad Rotor Or Distributor Cap (cracks or carbon tracks that are allowing the spark to short to ground). … Consequently, it could short out the coil voltage and cause; a faulty connection inside the terminal of the distributor cap. The result is a misfire in the spark plugs.
How does a GM ignition Control Module work?
GM vehicles are equipped with an ignition control module. The ignition control module is responsible for turning the ignition coil on and off. This process allows spark plugs to light the gasoline vapors at specific times, allowing the GM engine to start once the ignition coil is signaled.
What is a bypass ignition system?
The Ignition Bypass function allows for support of older GM ignition systems which used this function. … To allow the ECU to take control of ignition timing it will “bypass” the ignitor and send the signal to the ECU for ignition timing processing.
Does HEI distributor need ballast resistor?
When using HEI, the distributor requires a 12 volt feed. In order to achieve this the ballast resistor or the resistance wire must be removed from the circuit and replaced with a pure 12 gauge feed wire. … This means that there is no power on the “RUN” circuit when the ignition switch is in the “CRANK” mode.
Is a HEI distributor better?
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.
What are the symptoms of a bad pickup coil?
- No Engine Spark. The pickup coil sends the signal from the ignition module to the spark plugs during the ignition process. …
- Rough Idle. Because the spark plugs are not communicating proper timing to the fuel injectors, a rough idle may occur. …
- Engine Stall/Failure to Accelerate.
How many ohms should a pickup coil read?
For the pick up coil (magnetic pick up assembly), connect your ohmmeter between the orange and purple wires. Resistance should be 400-800 ohms. Next, connect the ohmmeter between the black wire and a good ground on the engine.
What causes a distributor not to fire?
Misfiring can be caused by loss of spark; imbalanced air/fuel mixture; or loss of compression. … Loss of spark is caused by anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. This includes worn, fouled or damaged spark plugs, bad plug wires or a cracked distributor cap.
How many volts does an HEI distributor need?
In order to run properly, an HEI requires a full 12 volts at all times. The 20-gauge resistance wire must be replaced by a 12-gauge wire (pink to maintain the factory colour coding), hooked up to the HEI cap’s “BAT” terminal.
Can a bad ignition cause no spark?
No spark is one of the most common causes of a no-start condition. It’s the first thing I check for. … The igniter or ignition module, the pick up coil or crank sensor, the cam sensor, and the ignition switch are included.
Does an HEI distributor have a condenser?
High energy ignition, also known as H.E.I., is an electronic ignition system designed by the Delco-Remy Division of General Motors. … A control module and magnetic pickup are mounted in the distributor, in place of a conventional ignition system’s breaker points and condenser.
Does an HEI distributor need a ground?
When you have an external coil (hei), ground wire in cap is not needed.
How do you test a distributor module?
Rotate the distributor center shaft by hand or by cranking the engine. Observe the distributor rotor as the engine is being cranked over. If the distributor rotor fails to turn, then the distributor or distributor gears are bad. The multimeter should read voltage alternating between battery voltage and zero.
What is ignition Control Module?
The Ignition Control Module is a part of the ignition system. It manages the electrical current that is fed to the ignition coil in order for it to generate the right amount of voltage for the spark-plug to ignite the fuel mixture. … In turn, the ignition control module sends the input to the ignition coil to fire it up.
How long does a ignition control module last?
Life Span. Federal law in the United States dictates that the ignition coil and ignition module on new vehicles are warranted for at least two years or 24,000 miles, whichever occurs first. The insulation in the ignition coil will degrade over time, but many coils are designed to last 100,000 miles or more.
What would cause an ignition coil to burn up?
The main cause of ignition coil burnout is the insulating material aging. For example, when the ignition coil high voltage can’t output smoothly, the current turbulence in coil will occur, causing the temperature to rise rapidly and accelerate the insulating material aging.
