The plugs were only part of the problem. (They were NGK VW/Audi part#1010000035AB, NGK BKB5EKU. Good plugs, lasted forever. Sure, they needed to be replaced, but the #6 plug well must have been flooded a time or two before the radiator was replaced last month. The metal plug jacket had a lot of green crud in it. I cleaned the plug jacket with cylinder brushes from Harbor Freight ($7.00 without coupon for an assortment 3 sizes in SS and brass) and finished with medium emery paper wrapped around a thin long screwdriver. The motor runs smoothly now, across the RPM range, without hesitation.. I'm wearing a pretty wide smile.
Oh and I missed on letter on the spark plug it's BKR6EOUP. It's a NGK "R" type.
I ended up swapping coils/ICM and put new correct plugs in, and now it runs waaaay better.
I have NGK double plat and they have been great. Over 10k miles. Just put some in my girlfriends 2.5 jetta as well with no issues.
Use the NGKs OP uses with factory gap. All stock apart from Stage1 Superchips tune now on 95RON. No issues 'cept consumption's falling now cooler temps are here (46\u00baF yesterday afternoon SE London) from 40+ on lightfoot long run to 36MPG same motorway run
I changed the spark plugs to Autolite Double Plat plugs from Autozone. The smoke cleared up and it is MUCH easier to keep cranked in the cold (30's F) in the morning. It still has a very light stumble every few cycles and a louder engine idle than I'd like, but runs good and seems to be much better.
ngk Same as prof315-jeff,bkr7eix on both setups,supercharger and now turbo and they still work,my only mishap is i bought a set bkr8 and one fouled do to much gas @ idle,now with megasquirt no problems so far.
autolites 3923 platinumsgave me the same mpg as the expensive NGK platinum.....
Don't put autolite (autocrap) in your car, they're junk.
Plugs I use Platinum plugs on my tuned 1.8t .I tried using bk7re's 3 or 4 times and each time the car ran like crap. I gapped at 028,tried 030 .The engine made less power up top every time by a difference of 2/3 psi.
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