[Vettezuki]

Well, a couple weeks back I took the Vette toa friend's house and we reprogrammed the computer for larger injectors. Turns out my problem wasn't an injector issue at all (though I still kinda needed larger injectors) but coil packs 2 and 4 not firing.

It's not the packs, the plugs or the harness on the coil pack bracket. All of these were exchaged for new ones from a working car and the problem was the same.

I tested the continuty of the inignition control signal lead from the pcm to the connector for the coil packs. It's fine. I'm a little mystified. . .

Here's the diagram. Any idea on what to check next. I suck (extra) at electrical. I suppose it could be the wires, now that I think about it, but I find that remarkably unlikely since they are essentially new and worked fine before. [Click on the pic for larger version.]

[kdracer73]

Try switching the wires / ciols with others from working cyls and see if the miss fire moves with them. OBD 2 system ? I could come by Sunday morning ?

[Vettezuki]

Originally Posted by kdracer73

Try switching the wires / ciols with others from working cyls and see if the miss fire moves with them. OBD 2 system ? I could come by Sunday morning ?

It's two cylinders, so I'm not sure I'd be able to tell if it just moved from 2 & 4 to other cylinders.

It is an ODBII sys, but nothing came up on codes with his EFI Live tuning software. A Tech II would be able to read if it's throwing anything at all.

Sunday morning would be swell.

[kdracer73]

9am ish good ?

[Vettezuki]

Originally Posted by kdracer73

9am ish good ?

What's that, like the crack of dawn? I can probably manage somehow.

[kdracer73]

See ya in the am

[Vettezuki]

Thanks again Paul.

Well, the reason it was an electrical connundrum is because it's (probably) not electrical. Cylinders 2,4 were firing with Paul's tester. But the intake spring on cylinder 6 was broke good, real good.