Hei module failure

Hei module failure DEFAULT

I hate these odd ignition issues, HEI module revisited?

It sure is hard to search for HEI module failure symptoms, where threads may have a fix involved. Might be cool to have a sticky with failure modes & fixes?

Previously, I had module after module fail. The OEM module (well, it was original as far as I know at least) had visible signs of burning on the underside. Replaced several modules after that, as well as the coil, and it finally came down to the pickup in the distributor that probably had fragile wires to the module. The failed pickup symptoms were odd; it would run, then run badly, and die with no codes thrown. An ohm reading on the pickup suggested it was bad, and replacement confirmed that was the issue.

Now... after running for around a year with an Accel module in my dizzy, it threw code 42 the other day. So I drove home, and while the check engine light stayed off, and it ran fine, I still changed the module with my spare new Jeg's unit. Again, it ran fine, until yesterday. Now, it's fine cold, and does some odd things which may indicate failure yet again. As it warms up, the check engine light comes on, and I loose power. Confirmed it's code 42 again. Then, as it continues to run (possibly cooling off) the light goes out, and power returns. And then the cycle seems to continue; light comes on with a sudden loss of power, and I didn't wait for it to go off again.

Now, my mounting bolts for the module look a little crusty. Does it get it's ground through those bolts? That could be part of the problem, however I'm not trusting the Jeg's module at this point. I still have the Accel module that came out, and may throw that in before I drive home today.

I did find through searching the best, most reliable module to purchase would be another GM version. So I may try to find one, however there haven't been any parts shops close by that carry them.


Sours: https://ck5.com/forums/threads/i-hate-these-odd-ignition-issues-hei-module-revisited.299863/

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Join Date: Jul 2007

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Re: HEI ingnition module failing HELP!!!!

Hey, xjmtdew, any progress? I skimmed through most of the responses and looks like you have a lot of good suggestions.

On my previous post, I asked about the voltage (12VDC) but didn't elaborate. There are some instances where aftermarket modules don't have over volatage protection and can really give you grief.

Here's an excellent piece that helped me when I converted.

I especially noted this paragraph towards the bottom. I know you said you have a 72 but just wonder if it's possible you have too much voltage from the alternator.

Another important issue is the combination of voltage regulator and HEI module that you are using. If you have a mechanical regulator (stock on pre-71), you may have problems with burnt out HEI modules. I've heard that many replacement HEI modules (especially the inexpensive ones) do not have built-in over voltage protection. To prevent problems, either use GM (or other quality) HEI modules, or change to a solid state voltage regulator.

Sours: http://67-72chevytrucks.com/vboard/showthread.php?t=319969
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Bad Hei Module Symptoms

Bad Hei Module Symptoms

What is the cause of the HEI module failure?

The most common cause of module failure is always the in-cap coil overheating and a team short, which leads to increased resistance that the trigger side of the module coil cannot handle.

By the way, how do I know if my HEI module is faulty?

Signs and symptoms of a HEI regulator with poor magnetic pickup

  1. The engine will not start. If the positive battery heating wire that powers the divider has no voltage, the HEI divider will not work.
  2. Motor Wire Plug Miss.
  3. Reduced fuel consumption.
  4. Low spark.
  5. Electric arc and shorts.
  6. Difficult start.
  7. Smog control has failed.

What happens if the ignition module breaks?

Engine Performance Problems One of the first symptoms of an ignition module problem is an engine performance problem. If the ignition module fails or has problems, it can lead to vehicle performance issues such as: B. malfunctions, hesitation, loss of performance and even lower fuel consumption.

And what causes the ignition module to fail?

The main reason ignition modules fail is heat. Most cars that have a recurring problem have the original distributor in the car. As the manifold ages and wears, the shaft sleeve deteriorates and begins to generate excessive heat.

Can faulty candles cause stuttering?

Common symptoms of bad spark plugs. Slow acceleration quickly leads to low fuel consumption. When the symptoms of bad spark plugs get worse, the car engine stops running. Engine failure causes noise in the trunk and emits more exhaust than normal.

How do I find my HEI module?

Simple tests for the HEI system:

How do you test an ignition controller with a multimeter?

Check if there is voltage at the positive pole of the coil when the ignition key is in the ignition. Place the multimeter’s red wire on the positive coil. Connect the black cable to the negative pole of the battery. Turn the ignition switch to the Run position.

How can I check the ignition module on a HEI distributor?

Turn on the ignition. Touch with the probe the test led of the smallest connection of the modules marked with G and connect the green detection coil to it. When you remove the probe from the socket you should hear a snap (spark) from the coil.

What is an HEI module?

High energy ignition. The distinguishing feature of HEI is that in most applications the ignition coil is integrated into the distributor cap. The system consists of a control module and a magnetic sensor mounted in the distributor. This eliminates the ignition points and bobbin thread.

How can I check a dispenser winding reel?

Can a bad distributor cause power outages?

Malfunctions may be due to loss of spark, unbalanced air-fuel mixture or loss of compression. These include worn, cracked or damaged spark plugs, faulty ignition cables, or a broken distributor cap. Sometimes improper shutdown is not due to a complete loss of spark, but rather to false sparks or high voltage electrical losses.

How can I repair an ignition controller?

How to replace an ignition controller

How much does it cost to replace an ignition controller?

The average cost to replace an ignition control module is between 274 and 386. Labor costs are estimated to be between 65 and 83, while parts are between 209 and 303. The quote does not include tax. and commissions.

Where is the ignition unit located?

The ignition control unit (ICM) is located in the distributor housing near the ignition coil. To access the module, remove the manifold cover, rotor, and dust cover, if applicable.

Does the ignition computer check the fuel?

How can I diagnose a faulty ECM?

Engine Stops or Stops

What is an igniter for?

Check the ignition timing of the ignition coils. The ignition control module is the heart of a vehicle’s ignition system. Check for sparks in the engine. The ignition control module relies on the car’s battery to provide the spark that activates the ignition system.

How can I test an ignition controller at GM?

If your GM car is slow or difficult to start, the ignition controller should be tested with an electrical test lamp.

Why is dielectric grease used on the ignition module?

Dielectric grease is essentially just silicone and is used to keep moisture out, not as a heat sink. If you need to do a little more, put a few washers on each side between the ICM bracket and the head.

How many volts does a share produce here?

Are HEI distributors useful?

A HEI distributor is excellent equipment for a transfer truck because it is completely autonomous. But without an external coil, HEI action cannot produce a strong spark at the speeds normally seen on the track. Engines with higher compression or higher horsepower also need a warmer spark.

What is centralized ignition?

Bad Hei Module Symptoms

Sours: https://howtodiscuss.com/t/bad-hei-module-symptoms/82352
4 Signs of a Bad Ignition Control Module failing symptoms engine stalls No Start No Spark Misfire

Most common cause of module failure is still overheating of the in cap coil, and its layer shorting, causing increased resistance the coil trigger side of the module cannot handle.

Click to see full answer

Consequently, how do I know if my HEI module is bad?

Signs & Symptoms of a Bad Magnet Pick Up HEI Distributor

  1. 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.
  2. Plug Wire Engine Miss.
  3. Reduced Fuel Economy.
  4. Weak Spark.
  5. Electrical Arc and Shorts.
  6. Hard Starting.
  7. Smog Check Failure.

Also Know, what happens when ignition module goes bad? Engine performance issuesOne of the first symptoms of a problem with the ignition module are engine performance issues. If the ignition module fails or has any problems it can lead to performance issues with the vehicle, such as misfires, hesitation, loss of power, and even reduced fuel economy.

Then, what causes ignition module failure?

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.

Can bad spark plugs cause stuttering?

Common Symptoms of Bad Spark Plugs. Slow acceleration will quickly follow poor fuel efficiency. As the symptoms of bad spark plugs get more serious, the car's engine will start to misfire. Engine misfires will create stuttering sounds and emit more exhaust fumes than normal.

Sours: https://findanyanswer.com/what-causes-hei-module-failure

Failure hei module

How do I test my HEI module?

Easy tests for HEI system:
  1. Test for power at the pink BAT terminal. You should have battery voltage w/ the key in the start and RUN positions.
  2. Connect the ground side of your test lamp to the battery POSITIVE cable.
  3. Remove the cap & rotor.
  4. DVOM (meter) still connected to green & white leads.

Click to see full answer.

Herein, how do I test my HEI ignition module?

Turn the ignition ON. Touch the probe of the test light to the smaller terminal of the module--it's labeled "G" and had the Green pickup coil wire connected to it. When you pull the probe OFF the terminal, you should hear a snap (the spark) from the coil.

what Causes HEI module failure? Most common cause of module failure is still overheating of the in cap coil, and its layer shorting, causing increased resistance the coil trigger side of the module cannot handle.

Consequently, how do I know if my HEI module is bad?

Signs & Symptoms of a Bad Magnet Pick Up HEI Distributor

  1. 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.
  2. Plug Wire Engine Miss.
  3. Reduced Fuel Economy.
  4. Weak Spark.
  5. Electrical Arc and Shorts.
  6. Hard Starting.
  7. Smog Check Failure.

How do you troubleshoot a GM HEI distributor?

Testing the GM HEI DistributorCheck the rotor and the cap for excessive wear. 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.

Sours: https://askinglot.com/how-do-i-test-my-hei-module

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