Hello all.
I have done a couple hours of searching and poking around various forums with little to no luck so far.
I had an open weekend and decided to help a friend out by swapping out her worn end links, doing a 115K inspection (filters, fluids, brakes, etc) and replacing her spark plugs that she insisted were bad.
After replacing the plugs and reinstalling the coil packs, the car is idling very roughly. I double checked the gaps on the plugs, they were all at .028 (recommended gap). After this didn't solve the problem, I started pulling the pig tails on the coil packs, one at a time to see which cylinder was misfiring. Found 1 & 2 to be dead. swapped coil packs with 3 & 4, to see if the problem traveled, but it did not. swapped plugs, for the same reason, and again, no travel.
Which means, I am not getting any power to the coil packs themselves. I do not have an Ohm tester here, so I cannot check resistance on the plug wires.

My real question is simply: Is there anything else I should be checking to see if I may have bumped a wire or fitting or vacuum line or something? I doubled checked the MAF and I don't know where or how I would have hit anything else. Also, would a vacuum leak lead to there being no spark at all?
Or would a cam sensor happen to (not so) conveniently die on two cylinders at the same time?

I am not overly versed in Volvos, but I have been working on cars pretty much my entire life. Any help would be greatly appreciated. Its one thing to screw up my own car, but this isn't mine and she has to work in the morning.

 

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I was really careful to not bend the ignition wires around and made sure that they all sat back where they had been initially.

 

would the MAF cause there to be no spark going in to the coil packs?

Also, the two codes being thrown are both 0300 :multiple / random misfire. And I've narrowed it down to being the 1 & 2

There is now a "buzzing" sound from in the engine compartment. Hadn't been doing that until this morning. Anybody else have this happen? Or am I completely out of luck here?

 

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