Changing the plugs from bkr7e's to denso ik27's helped a bit too.
Pros: helped a bit
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Turns out the AutoLite plugs that a local parts store sold me are crap for this engine (actually caused misfires) so I went and got Denso double platinum plugs the next day and put those in.
Vehicle:
Volkswagen Passat
I decided to go with the Denso Iridium Spark Plugs Part # 5304#4 and am VERY happy with them. My car runs better than it ever has. These plugs were a little expensive but still less than what the dealer wanted for OEM plugs. I definitely recommend them!
Pros: car runs better, highly recommended
Cons: a little expensive
Part number: 5304#4
if you're gonna go iridium get the denso's because they (denso) have a smaller tip on them allowing for a "cleaner spark" and therefore a greater chance for detonation....less missfires as someone else has already said....I've run them both and I'm very pleased with the denso's
Pros: cleaner spark, less misfires
I did not, and bought the Denso Iridiums. I have less misfires and slightly stronger gas mileage since install. Just my experience.
Pros: less misfires, stronger gas mileage
When it is warm out the IK24's work awsome. But on cold mornings they suck for the first 3-5 minutes of driving.
Pros: work awesome when warm
Cons: suck on cold mornings, choppy, sputtered
Part number: IK24
Been using the desno IK24's with a .32 gap. Works very well but that plug is a tad to cold. Runs a tad rough untill I get her warmed up.
Pros: works very well
Cons: tad too cold, runs rough cold
Part number: IK24
I like the Denso 3008's I've been using for a couple years now in my turbo.
Pros: long-term use, good performance
Vehicle:
Toyota
Part number: 3008
im using the denso 1k22 great plugs for ko4
Pros: great plugs
Part number: 1K22
Just be careful with the Denso plugs. Denso has the gap specified incorrectly in the database so the gap is larger than they should be. It'll run but my cause to long term problems such as coilpack failure.
Cons: incorrect gap, coilpack failure risk
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