testing HEI coil
- Test for power at the pink BAT terminal. You should have battery voltage w/ the key in the start and RUN positions.
- Connect the ground side of your test lamp to the battery POSITIVE cable. Probe the TACH terminal on the dist. cap while a helper attempts to start the engine. ...
- Remove the cap & rotor. Remove the green & white leads from the module. Connect your ohmmeter to the green & white leads. You should have approx. ...
- DVOM (meter) still connected to green & white leads. Set your DVOM to AC VOLTS. Have a helper crank the engine as you watch the AC VOLTS reading. ...
How do you wire a Hei?
How to Wire an HEI Distributor Cap
- Connect the primary wires to the HEI distributor, via a plug that snaps into the distributor cap. ...
- Insert the spark plug wires in the proper order on the distributor cap. The proper order depends on the specific vehicle.
- Locate the distributor's rotor button under the cap and determine its direction. ...
Is there a way to test a Hei module?
for the HEI gurus, does this look like a good way to diagnose HEI issues? "The easiest way to test a module on the car is to ensure that the wiring & pickup coil are OK. The module is essentially an amplifier with a built in analog to digital convertor. Easy tests for HEI system:
How do you test a GM Hei pickup coil?
- Engine misfires, rough idle, and loss of power. One of the most common symptoms associated with a faulty ignition coil is engine performance issues.
- Check Engine Light comes on. Another symptom of a potential issue with the vehicle's ignition coils is an illuminated Check Engine Light.
- Car is not starting.
How to diagnose Hei distributer, no spark no start.?
The issue causing the engine to not start usually boils down to one of the following:
- The engine is not receiving fuel.
- The engine is not receiving spark.
- The engine has a compression problem.
How do you test a HEI coil with a multimeter?
6:109:01HEI Coil Test (The Short Version) - YouTubeYouTubeStart of suggested clipEnd of suggested clipThanks for got to make sure they're tight. If they're loose that'll give you a false reading as wellMoreThanks for got to make sure they're tight. If they're loose that'll give you a false reading as well you have this particular style of test probe leads for your o meter multimeter.
Why is my HEI distributor not firing?
Testing the GM HEI Distributor A no-spark condition is checked by checking the distributor for power at the connector on the side of the cap. If there is power, disconnect the electrical connector and remove the cap. Check the rotor and the cap for excessive wear. Check the coil tower for excessive wear.
How many volts does a stock HEI coil put out?
Description. Top Street Performance HEI ignition coil provides 65,000V to your spark plugs. This coil is a great upgrade to your stock ignition system.
How do you bench test HEI ignition module?
Connect the ground side of your test lamp to the battery POSITIVE cable. Probe the TACH terminal on the dist. cap while a helper attempts to start the engine. The test lamp should blink repeatedly as the engine cranks.Jun 10, 2012
How do I know if my HEI module is bad?
Signs & Symptoms of a Bad Magnet Pick Up HEI DistributorEngine 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.
What would cause a coil not to fire?
There are a few reasons for no spark, new coil pack could be defective, crank sensor, ignition module or bad wire in primary circuit, faulty ECM/PCM. You may have to have a good technician have a look, diagnose and estimate repair.Sep 20, 2016
Is HEI or coil better?
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.Sep 1, 2001
How many volts does a distributor need?
In order to achieve combustion, though, there needs to be about 40,000 to 100,000 volts at the spark plug.
How do HEI distributors work?
The HEI distributor is an inductive-discharge-style ignition, but with the points replaced by a solid-state switching device called an electronic ignition-control module. The module works like an electrical switch, turning power on and off to the ignition coil. This, in turn, causes the coil to generate spark.Nov 12, 2013
How do you test a bad HEI distributor?
Use a volt meter to test the hot wire while a buddy cranks the engine over. If the voltage drops below 10.5, check your battery. If the battery is fine, make sure the wire feeding the distributor is sufficient.Dec 11, 2017
How do you test a GM ignition module with a multimeter?
Place the red lead of the multimeter on the positive coil terminal. Place the black lead to the battery negative terminal. Turn on the ignition switch to the "Run" position. The multimeter should read battery voltage at the positive terminal.
How do you test a GM ignition module?
Clip the negative test light lead to a solid ground such as negative battery terminal. Ask a partner to crank the engine numerous times. The test light should turn on and off as the ignition control module is signaled. If no light is preset, the module is faulty and needs to be replaced.
How many OHMS should a Dvom coil read?
Next measure the secondary, set your DVOM scale to RX10k or higher..put the probes between the BATT and the carbon pickup for the COIL..it should read between 6000 and 30,000 OHMS..Outside of that range toss the coil and get a new one.
Can a coil go short?
It is possible but pretty rare. A coil could go open or short when it gets hot.
How to check coil resistance?
To check the coil secondary resistance, connect an ohmmeter between the rotor button and the BAT terminal. Then connect the ohmmeter between the ground terminal and the rotor button. The resistance in both cases should be between 6000 and 30,000 ohms.
How to check if a pickup coil is bad?
1. Test for power at the pink BAT terminal. You should have battery voltage w/ the key in the start and RUN positions.#N#2. Connect the ground side of your test lamp to the battery POSITIVE cable. Probe the TACH terminal on the dist. cap while a helper attempts to start the engine. The test lamp should blink repeatedly as the engine cranks. No blink= bad module or pickup coil. Further testing is required to pinpoint the problem. Blink but no spark = bad ignition coil.#N#3. Remove the cap & rotor. Remove the green & white leads from the module. Connect your ohmmeter to the green & white leads. You should have approx. 800-1500 ohms depending on the ambient temperature. Open circuit (infinite ohms) = bad pickup coil.#N#Wiggle the green & white leads as you test. Ohm reading should remain constant if the leads are good. If the reading varies as the leads are wiggled, the pickup coil is bad. You'll often find broken pickup coil leads this way.#N#4. DVOM (meter) still connected to green & white leads. Set your DVOM to AC VOLTS. Have a helper crank the engine as you watch the AC VOLTS reading. A good pickup coil will produce about 3V AC when cranking. Less than approx. 2V AC indicates a bad pickup coil.
