What are these?

Just out of curiosity. There are two. One on each side mounted in front of the engine by the valve covers.

Laga said:

Just out of curiosity. There are two. One on each side mounted in front of the engine by the valve covers. View attachment 83778

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Those are the ignition transformer capacitors used on each bank to control radio frequency interference (or RFI) bleed back into the electrical system from ignition flyback voltage generated when COPs fire the plugs.

Hope this helps.

Thanks. Is the location/orientation critical to the ignition system? Would moving them cause a problem? Like a misfire at high rpm’s?
The right side one was not put back in its original position when my engine was reassembled. It was mounted about 3” away from original.

Laga said:

Thanks. Is the location/orientation critical to the ignition system? Would moving them cause a problem? Like a misfire at high rpm’s?
The right side one was not put back in its original position when my engine was reassembled. It was mounted about 3” away from original.

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From what I understand on these, that shouldn't matter. As long as the capacitor is mounted to the engine & has a clean ground path to the engine block its good.

PS edit--As far as a misfire goes, these are attached to the 12v+ side of COP harness (thus services all COPs on the bank) so my gut says probably not (if they went bad causing a short to ground) as I think they'd take out the #40 fuse in BEC & you'd have no power to the COPs.....but if they failed open I'd think you'd get RFI but not affect any COP operation otherwise.

Easy enough to test........just unplug them & drive the car (you'll most likely get RFI) to see if the misfire goes away.

Hope this helps.

Thanks again. I’ll give it a try.

Capacitors

GlassTop09 said:

Those are the ignition transformer capacitors used on each bank to control radio frequency interference (or RFI) bleed back into the electrical system from ignition flyback voltage generated when COPs fire the plugs.

Hope this helps.

Click to expand...

Thanks. Useful information.