I am about to do my first compression test. Late model A4. Newly installed electronic ignition module. My procedure after doing the required google research is below.
Question: easiest and safest way to "disable the coil"?
1. Remove the center high tension wire at the distributor cap (not at the coil) and connect a jumper from it to the engine block ground, away from the cylinders - any unpainted metal will work. Ground the wire so the power being produced by the ignition module/coil allows the load dissipate.
OR
2. Disconnect the small eletrical wires at the coil and tape them off. This is my preference, if it is a valid option.
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Draft notes:
Manually with a gauge.
Warm up the engine.
Disable the ignition module or coil:
(Removing the center high tension lead at the coil is not good enough: coil and IEM generate electricity but it has no where to go.)
Disable electronic fuel pump, if present. Or fuel injection, if present.
Pull the plug wires off the plugs, noting their order. Mark the wires first (1 dot for #1 cylinder, etc).
Blow dirt away from the plugs and their holes.
Remove all the spark plugs (so engine can rotate easily) and place them in order on marked paper.
Insert gauge into one plug hole.
Hold throttle open to ensure adequate air intake.
Crank engine a few timesc(4-6).
Check the gauge reading.
Repeat at next hole.
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Question: easiest and safest way to "disable the coil"?
1. Remove the center high tension wire at the distributor cap (not at the coil) and connect a jumper from it to the engine block ground, away from the cylinders - any unpainted metal will work. Ground the wire so the power being produced by the ignition module/coil allows the load dissipate.
OR
2. Disconnect the small eletrical wires at the coil and tape them off. This is my preference, if it is a valid option.
---
Draft notes:
Manually with a gauge.
Warm up the engine.
Disable the ignition module or coil:
(Removing the center high tension lead at the coil is not good enough: coil and IEM generate electricity but it has no where to go.)
Disable electronic fuel pump, if present. Or fuel injection, if present.
Pull the plug wires off the plugs, noting their order. Mark the wires first (1 dot for #1 cylinder, etc).
Blow dirt away from the plugs and their holes.
Remove all the spark plugs (so engine can rotate easily) and place them in order on marked paper.
Insert gauge into one plug hole.
Hold throttle open to ensure adequate air intake.
Crank engine a few timesc(4-6).
Check the gauge reading.
Repeat at next hole.
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