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disabling ignition coils for compression test

Old Mar 22, 2021 | 11:11 PM
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Default disabling ignition coils for compression test

the instructions for my remote starter switch (bump starter, not wireless) say to "Remove the coil connector (primary) and the high-tension wire from coil secondary terminal. Connect jumper wire between coil secondary terminal and ground on engine."

I take it one of the bolts on each of the ignition coils is like the secondary terminal on this car? do i wanna just pull off all the ignition coils an then jumper the metal plate of the Ignition Control Module to ground? or how do you guys do this?

2007 Pontiac Grand Prix 3.8 Naturally Aspirated
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Old Mar 22, 2021 | 11:23 PM
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I would be inclined to just unplug the ICM. I think it'* one bolt in the middle of the plug, and the plug should slide out.

That'* a lot of putzing around that I don't think needs to be done. I think this also prevents fueling because the ICM also feeds the crank signal to the PCM.
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Old Mar 23, 2021 | 04:50 PM
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I think there is a 98% chance that you are right, but people occasionally fry things doing compression tests by not being mindful of where the ignition current goes. I'd just like to hear from somebody who can verify the hookup that is going to work with this system, either because they've done it before or because there is some document they can point to (the GM FSM just says "Disable the ignition.")
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Old Mar 23, 2021 | 04:56 PM
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actually, it says:

"1. Run the engine until it reaches normal operating temperature. The battery must be at or near full charge.

2. Turn the engine OFF.
Important: Remove the Powertrain Control Module (PCM) and the ignition fuses from the I/P fuse block. Refer to Electrical Center Identification Views .

3. Disable the ignition.

4. Disable the fuel systems.

5. Remove the spark plugs from all the cylinders..."

what'* unclear is if they meant that removing those two fuses is what disables the ignition, or if there is something more you need to do, since it is in a separate step.
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Old Mar 23, 2021 | 05:57 PM
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Warm the engine. Pull the plugs and pull the small connector from the end of the ICM. It'* the power supply for the module. Do your compression test.
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Old Mar 23, 2021 | 08:26 PM
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Yep, what they said ^^^^^^^
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Old Mar 23, 2021 | 11:17 PM
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Originally Posted by carfixer007
Warm the engine. Pull the plugs and pull the small connector from the end of the ICM. It'* the power supply for the module. Do your compression test.
so i guess there is no benefit to pulling the ignition fuse, then. any reason I shouldn't do that other than wasting a minute?
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Old Mar 24, 2021 | 12:52 AM
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That about sums it up.
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