New NGK Spark Plugs
Pros: new spark plugs
Vehicle:
Volkswagen Jetta
Reviews of NGK spark plug
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2360 votes
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I'd replace them immediately, you'll notice an improvement right away.
Pros: notice an improvement
You will have improved power and fuel efficiency if you replace those plugs.
Pros: improved power
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.
Pros: hold boost exceptionally well
Cons: engine made less power
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.
Pros: fixed misfiring under boost
Cons: extremely overdue replacement
Just reporting in after some usage... the NGK 4644 aka BKR7E seems to foul easier than the Autolite plugs I ran previously.
Cons: fouls easier
Part number: 4644
new NGK R's (copper) runs better but not 100%
Pros: runs better
Cons: not 100%
I also suggest NGK spark plugs. And not necessarily the high-end Iridium ones. The 'lower' end ones are just as good.
Pros: 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:
Pros: improvements to acceleration, responsiveness
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?
Pros: car feels better
Cons: timing pull still present
Vehicle:
Audi TT
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