Spark plug NGK or OEM FORD

I'd replace them immediately, you'll notice an improvement right away.

You will have improved power and fuel efficiency if you replace those plugs.

It was the plugs all along. No wonder though, since they were extremely overdue for replacement. Checked the gap on every one i pulled out. They ranged from .037 to .048... so there must have been some severe blowby, hence the misfiring under boost.

I also suggest NGK spark plugs. And not necessarily the high-end Iridium ones. The 'lower' end ones are just as good.

I personally run 0.035" on BKR7E-IX plugs and the red 06E coils. Significant improvements to acceleration and responsiveness after the ECU adapted :thumbup:

When I got the car back from the shop I installed a wide-band O2 and changed the plugs to NGKBKR7e's (Copper) gapped to 0.028. I also re-greased the DV, since last time I had used generic grease general purpose grease, with high temp grease. The car feels a lot better now, and timing pull ranges from 3-8 under WOT. The AFR gauge shows anywhere from 12.5-13.0 under WOT, and bounces between 14.3-15.2 or so while cruising. I also believe that I hear the DV a bit more (have a cone intake), so maybe it was sticking?

Replaced mine at 40,000 with NKG Platnium and it runs better than ever. I wish I had a pic of the ones I removed. They were baddddd.

I got the plugs in just fine, and since this was the first time they had ever been changed, the originals were still there. Aside from having the Audi/ VW logos printed on the topside of the plugs' insulators, these are regular ol' NGK PZFR5D-11 plugs (stamped on the metal). The new ones I put in were pre-gapped at .040, and the old, worn ones were at .044 for the passenger-side plugs and at .043 for the driver-side plugs. I'm guessing that the elevated distance/numbers reflects natural wear and metal erosion over time.

NGK BKR7EIX is a popular plug for 1.8T and 2.0T, but it is one step colder in the heat range. Fine for those whom don't see freezing and below temps.

Hey I am just wondering what are the best plugs to get for my jetta? I bought some NGK's from auto zone and I was getting misfires in EVERY cylinder.