Rough Idle After Changing Coil Packs

[photonmoo]

Hi again guys

I've been having a few problems lately with a 98 R34 N/A... initially the check engine light was coming on and the car was feeling very sluggish, so I did the ecu fault code test, and it came up with 21.

I purchased some new coil packs from RBCeffy25 assuming the coil packs were faulty and they were probably gonna need replacing soon anyways.

I followed some of the guides on here how to change spark plugs / coil packs, and managed to swap them out.

But now the car idles very rough, seems to have lost most of it's power and fuel efficiency is terrible.

I rechecked everything again today, and it all seems fine... but it's still idling very rough.

Any ideas please? Did I prehaps fudge something up whilst changing the coils?

Any help would be really appreciated..

Thanks

Edited September 7, 2011 by photonmoo

[photonmoo]

Forgot to mention

The ecu fault code reads 55 now, which makes it more bizarre and annoying, and the check engine light has stopped coming on.

[DVS JEZ]

Try putting the stock coil packs back in to see if that fixes it.