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2004 Buick LeSabre starts, jerks, dies

Engine Starts For A Moment, Then Dies. It also jerks as if its not getting enough air.
2004 Buick LeSabre

A bad Ignition Control Module can cause that.


ICM’s function in two modes.

These are the start mode and the run mode.

During the start mode, the ICM allows full battery voltage to the coil(s) to make sure there’s a hot enough spark to start the cold engine.

When the engine starts and the ignition switch moves to the run position, ICM goes into the run mode.

The ICM then drops the voltage to the ignition coil(s) so as not to burn up the Coil(s) and other secondary ignition components when the charging system comes on line.

This works the same way as a ballast resistor/wire did on older ignition systems.

So the problem may be that the start mode of the ICM functions, but the run mode of the ICM no longer functions.

And the engine dies.


A question for you. My 02 LeSabre will occasionally Drop into some sort of low power mode and will not exceed about 25 mph. The only way to clear it is to stop and turn off the ignition. Once that is done, all is well for another 6 to 8 months. Only happens after a cold start and within a few hundred yards of initial start. NO codes.
Any thoughts?