How can I Check my GM HEI distributor?
How can I Check my GM HEI distributor?
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.
When to replace Ignition module on GM Hei?
If any of these tests show drastically different readings, the coil is bad. If the coil is good, the cap and rotor are not cracked or worn significantly and there is no spark at any wire, replace the ignition module.
Which is better DIS ignition or HEI distributor?
DIS ignition systems are much better in terms of reliability with less moving parts to fail however there is still a handful of us that cling onto old school distributors. The most common of the bunch is the ever reliable GM HEI internal cap.
When to replace centrifugal advance mechanism on GM HEI distributor?
If the advance rises about 10 degrees, the vacuum advance mechanism is operational; if not, replace it. Raise the rpm to 2,500 and recheck the timing. It should be around 32 degrees plus or minus one degree. If the timing does not rise, the centrifugal advance mechanism isn’t working.
How do you adjust a GM HEI distributor?
Adjust the distributor, if necessary, by loosening the hold-down nut on the distributor base and turning the distributor and rechecking until it meets specifications. Turn the distributor counter-clockwise to advance and the clockwise to retard the spark.
If any of these tests show drastically different readings, the coil is bad. If the coil is good, the cap and rotor are not cracked or worn significantly and there is no spark at any wire, replace the ignition module.
When to remove the coil in a Hei?
Whenever I do a large cap HEI, I ALWAYS remove the coil in cap coil, and install a remote, round oil filled coil, just saves a lot of problems from that heating device on the top of the distributor jokingly referred to as a coil. This removes a lot of under cap temperature, and usually, stops the coil/module failures in their tracks.
What are the symptoms of a bad HEI distributor?
Overall poor engine performance and weak acceleration points to weak spark in the HEI system. Insufficient spark or coil voltage in the HEI distributor will allow excessive hydrocarbons and carbon monoxide emissions.
