Where is the ignition coil on a HEI distributor?
The HEI distributor actually houses the ignition coil underneath that massive cap. You will need to purchase a new set to match your new distributor. With that said, reattach your individual plug wires to their proper posts. Take your time and make sure you have them right.
When did GM start using the HEI ignition system?
It was not until the model year of 1974 that GM offered the new HEI ignition system as an alternative. One year later in ’75, it became standard equipment for all, and with good reason.
What should the plug gap be for a HEI distributor?
Tip: When you have installed your HEI distributor, its best to widen the plug gap as well. Tip: You should run a new power wire that is getting a full 12 volts. Simply splicing into the existing lead is not getting maximum power to the ignition, as that is a resistance wire.
Can a HEI distributor be a points distributor?
Since diagnosing the module, pickup, and the coil of an HEI distributor is a little trickier than an old-school points distributor, we checked in with the folks at Performance Distributor to get some diagnostic input. The HEI distributor has eliminated the need to do roadside tune ups to a point-style distributor.
How does Hei work in a points ignition system?
In a points ignition system, as the engine speed increases, the available energy to meet the demand of the spark plug decreases. HEI eliminated this problem by removing the resistance wire and applying full alternator output to the primary circuit.
What to do if your engine eats a Hei module?
Check the continuity of of that center wire to the body of the HEI, see that there’s no corrosion where it attaches to the body. Star locks are good. There’s a condensor on the wiring harness, get a new one or just a new GM wire harness.
How does a bad pick up HEI distributor work?
This system works in conjunction with the vehicle’s computer, and will announce a failure via a trouble code light on the dashboard. An HEI distributor that has a worn pick-up coil or corroded magnetic poles will produce a weak spark, with insufficient voltage to ignite the combustion gases.
What does a yellow Spark on a HEI distributor mean?
A yellow or intermittent spark indicates weak HEI coil output. Examining the HEI distributor at night with the hood up can pinpoint any stray electrical arcing from the cap, wire connections, distributor cap retainer and connector terminals.