What does it mean when your ignition coil is not working?
What does it mean when your ignition coil is not working?
CASE 1: You got spark on all of the spark plug wires. This is the correct test result and it tells you that the spark plug wires, distributor cap and rotor, ignition module, and ignition coil are working. These components are NOT the cause of your no start condition.
What kind of ignition coil does a corvette have?
The coils on early Corvettes are black cylindrical devices; starting in 1975 the coil per se as a discrete cylindrical device was abandoned when GM made the switch to HEI breakerless ignition systems.
What happens when you replace the coil wire on an engine?
You can replace the secondary coil wire on an engine that uses one with an equal length of vacuum hose and the engine will start and run. The powerful spark will travel down the hollow hose to the distributor cap, but the engine will stall under any load because of the weakened spark.
What kind of transformer is an ignition coil?
An ignition coil is a type of pulse transformer that multiplies the low voltage received from the battery or alternator to many thousands of volts when the breaker points open and close.
CASE 1: You got spark on all of the spark plug wires. This is the correct test result and it tells you that the spark plug wires, distributor cap and rotor, ignition module, and ignition coil are working. These components are NOT the cause of your no start condition.
The coils on early Corvettes are black cylindrical devices; starting in 1975 the coil per se as a discrete cylindrical device was abandoned when GM made the switch to HEI breakerless ignition systems.
You can replace the secondary coil wire on an engine that uses one with an equal length of vacuum hose and the engine will start and run. The powerful spark will travel down the hollow hose to the distributor cap, but the engine will stall under any load because of the weakened spark.
What should the resistance be on a Delco ignition coil?
This reading of 8.84 does indicate that the coil’s secondary windings are not putting out as much voltage as they should; the minimum acceptable resistance reading here should be 11.00, with approximately 13.5 being normal. Here’s the primary reading on the new replacement GM Delco coil before I installed it.
What happens when the distributor rotor and cap fail?
Excessive or unusual engine noises Your vehicle may make some very strange noises if the distributor rotor and cap are malfunctioning – specifically because the cylinders will try to fire but fail. You might hear a tapping, clicking, or sputtering sound when the distributor rotor and cap are failing.
Can a bad distributor rotor cause an engine misfire?
Engine misfires can occur for a number of reasons. Checking your distributor rotor and cap to see if they need to be replaced is one way to ensure that everything is in solid working order.
How to test the GM distributor mounted ignition module?
By testing for spark directly on the distributor cap towers that feed those spark plug wires. OK, this is what you need to do: Remove the spark plug wire that did not spark from its tower on the distributor cap and place the spark tester directly on the tower.
Excessive or unusual engine noises Your vehicle may make some very strange noises if the distributor rotor and cap are malfunctioning – specifically because the cylinders will try to fire but fail. You might hear a tapping, clicking, or sputtering sound when the distributor rotor and cap are failing.
Engine misfires can occur for a number of reasons. Checking your distributor rotor and cap to see if they need to be replaced is one way to ensure that everything is in solid working order.
Attach the HEI spark tester to this wire. Ground the HEI spark tester to the battery negative (-) terminal with a battery jump start cable. Ask your helper to crank the engine while you watch for spark jumping across the air gap of the spark tester. You’re gonna’ get one of the 2 results: (1) Spark or (2) No Spark.
