Help! R34 Rb25De - Changed Coil Packs - Ran Well For Approx 40Kms Then Started Misfiring Again.

[lkp]

Had a misfiring problem - took it to local mechanic who replaced one coil pack and the car was running well for 1 day then misfire returned. I used one of the diy tutorials to replace all coil packs. car ran fine for approx 40kms then started misfiring again - nowhere near as bad as they were misfiring before I changed all the coil packs but misfiring nonetheless.What could be causing this?? Anybody?

[zebra]

Did you change the spark plugs?

[Cowboy1600]

What brand coilpacks?

[lkp]

No, did not change plugs - they were all replaced about 7 months ago....(am checking them all today, though)

I went a bit cheap on the coil packs - FUJI Ultra sparks (sold by osaka.co.nz) ($345 for all six)

[lkp]

Also, starts misfiring only when engine has warmed up a bit and also only at low revs - is getting progressively worse though....

[WMDC35]

as above, weak coils prob fouled old plugs, just change them, haven't heard of those coils, maybe they're getting weak already, go for .8 plugs

(this isn't forced induction performance related haha)

Edited August 17, 2012 by WMDC35

[OEM_as_f*ck]

Plugs are most likely covered in shit from driving around with f**ked coilpacks. Change them.

If your mechanic changed one coilpack, I would never go back there again. Unless you told him to quick-fix it and change one.

Its like buying one new tyre, or replacing one big end bearing, or one brake pad. Just stupid.

[lkp]

One of the new coil packs was faulty. Replaced it and misfire is gone. Thanks for the feedback guys.