96 Eldo engine sputters and stalls. P0300 and P1380 Engine Misfire.

[thebossman]

Hey all,

96 eldo etc. driving along and out of nowhere the car sputters and stalls. She restarts and drives hard. Every time I start her up the same thing. Plugs and wires have been replaced. She was running strong. I'm getting P0300 and P1380 codes....engine misfiring.

Where do I start?

[Ranger]

Check the fuel pressure for starters. That's cheap and easy.

[thebossman]

Fuel pressure is okay, there is a mild tapping, outside of the engine. I was hoping the codes would give direction. Not this time. Is there a module between fuel lines and the fuel injection?

[submariner409]

If the misfires began after you replaced the plugs and wires (ACDelco #41-950 plugs and an AC wire set), check your wire hookup against these diagrams. Coil-plug wiring is critical because this is a waste spark system: two plugs fire at the same time. Google "waste spark ignition".

No fuel injector module per se; they're tripped by the PCM signals from the CKP's and CMP and the pulse duration is modified by engine operating conditions such as temperature, throttle opening, MAF, MAP, and load.

[Ranger]

If fuel pressure is good, then it must be ignition. Did you do the wires one at a time or yank them all and then replace them. If so, there is a good chance that you misrouted 2. Check them as Sub suggested. If all is well there, then you may have a coil breaking down or a bad ICM.

[thebossman]

Not the wires or plugs. they had been changed 6000 miles ago.

[thebossman]

Icm.....?

[submariner409]

When you go back and check your plug wiring according to the posted diagrams, dig deeper and remove each coil from the ICM pack. Check the coil contacts and grounds.