Every plane of this coil (#4) had cracks in it!










On a positive note, the plugs looked great! I still installed new replacements, but the condition of these makes me confident the old lump will be back to her best with the new coils.

 

Now the coils can work flawlessly with those cracks, as the enviroment where they are are pretty harsh.
But if you have misfire, start with getting new plugs and coils

 

Looks rich

 

In my experience a misfire usually points to a leak on the pressure side. Coils and plugs would not hurt though

 

coil + plugs and misfire will be gone. Pull down the rubber boot/spark plug connectors, see more cracks, this is where they start cracking in my experiences...

 

I have had bad coils cause misfires more than once, you should see a nice difference.

 

Crappy iphone pic. Came out very dark. I agree if they really looked that colour that would indicate a mildly rich condition.

The colour is actually much lighter than in the pic.

 

My car was running fine unless I gave it full throttle/boost, then huge misfires and a CEL with "Drive to garage" on the dash.
Durametric indicated excessive misfires on cylinder 4. Spot on diagnosis IMHO based on the state of that coil.
All the other coils looked just fine.

 

I always tell clients to change plugs and coils especially on tuned cars...

 

cracked coils, solved

 

It wont be the plugs in your case, however, your symptoms lead to electrical... In your case, battery or charging system and/or cracked ignition coils. My prediction here, if im correct, is that you probably didnt change out the coils when you changed out those plugs? Best way to check, pull off the 4 T-30 chrome bolts to remove the coil covers on the drivers side.. then remove the first two coils and carefully examine for cracks in the boot... It might even look like a line that is from oem, so check carefully. And for battery, check the date.... If its anything close to or around the 5 year mark(give or take a year), then high chances it is the battery. And hence, the crc intake valve cleaning helps here too... less load on the engine.

 

I'm pretty sure that guy has fixed his misfires by now... That post was from 5 year ago...

 

Holy thread resurrection

Just to close this off, I replaced all 6 coils with with the latest Porsche parts and plugs with OEM equivalents. No misfires since then.

Of course, now I'll have gone and jinxed myself....