91 Buick Park Ave.

[tjscarts]

This 3.8L engine has a ignition pac that only fires 4 of the 6 spark plugs.The two center are not firing.
Its the rectangular IG pac mounted on the front left of the engine next to the alternator.
No service engine soon codes. I have changed the pac, runs the same.

Any ideas.....?

Thanks....TJSCARTS

[kok328]

Possibly a bad ignition module (have it tested) located under the tri-pack coils.

[maxwedge]

Is this the coils/module combo? One possibility assuming a known good crank sensor and all the harnesses to the ICM are solid, not corroded or frayed, would be the pcm.