Weak spark cyl 2 & 4
#1
Weak spark cyl 2 & 4
I have a 1995 Buick LeSabre with 3.8. Engine miss under load. Code P0300.
Has new plugs, wires, coil on cyl 4. Have replaced ICM. Still weak spark on cylinders 2 & 4. I have checked wires from PCM to ICM. Any ideas?
Has new plugs, wires, coil on cyl 4. Have replaced ICM. Still weak spark on cylinders 2 & 4. I have checked wires from PCM to ICM. Any ideas?
#2
Senior Member
True Car Nut
Sounds like you are hitting all the right stuff. If you had not said you are getting weak spark, based on what you have replaced already I would suggest testing fuel pressure at the rail.
Try switching the new coil with a coil from another position and see if the weak spark moves with the coil. Wouldn't be the first time a new coil is defective.
Try switching the new coil with a coil from another position and see if the weak spark moves with the coil. Wouldn't be the first time a new coil is defective.
#6
Senior Member
True Car Nut
That (unfortunately) makes sense. If you rule out the ignition system as you already have, it may be a mechanical issue. You might want to pull a rocker cover and inspect the valve springs, but I think you have bigger problems.
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